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一些关于Linux kernel编译的学习及实践

发布于 2021/12/08 16:56 7,314浏览 3回复 90,973

什么是交叉编译?

回忆:

在Linux环境下回顾编译过程
0
GCC编译器特点: 在主机A编译,在主机A运行 --> GCC编译器也叫本地编译器。
无论是本地编译,还是交叉编译,都是属于把高级语言变成目标程序过程;
所谓交叉编译: 在主机A编译,在主机B运行 --> 对应的编译器就是交叉编译器,也叫交叉工具链

什么是交叉工具链?

在主机A编译,在主机B运行 --> 对应的编译器就是交叉编译器,也叫交叉工具链

如何配置交叉工具链?

下载,解压,(修改profile.d/myenv.sh)

为什么要使用交叉编译?

目标板卡可能无法完成编译,既需要一台更好的电脑来为其编译其需要的软件

各种交叉编译工具链的区别

(arm交叉编译器gnueabi、none-eabi、arm-eabi、gnueabihf、gnueabi)

命名规则

交叉编译工具链的命名规则为:arch [-vendor] [-os] [-(gnu)eabi | abi ]

arch - 体系架构(目标cpu架构),如ARM,MIPS,这个字段通常不会省略;
vendor - 工具链提供商(可以是none、unknow或者直接省略。)
os - 目标操作系统(这个字段一般是linux或者none,none表示没有操作系统的,不支持那些跟操作系统关系密切的函数,比如fork(2),他使用的是newlib这个专用于嵌入式系统的C库。如果这个字段是linux,表示编译出来的程序可以运行在linux上,使用Glibc库)
abi 应用程序二进制接口(Application Binary Interface)
这个字段常见的值就比较多了,比如 abi 、 eabi 、 gun 、 gnueabi 、 gnueabihf 、 uclibc、 uclibcgnueabi 等;
eabi - 嵌入式应用二进制接口(Embedded Application Binary Interface)更多解释见下面的第三点 ABI 和 EABI 区别
arm gcc还分为 是否支持操作系统
支持操作系统: arm-none-linux-eabi-gcc
不支持操作系统:arm-none-eabi-gcc

1.arm-none-eabi-gcc

(ARM architecture,novendor,nottarget an operating system,complies with the ARM EABI)用于编译 ARM 架构的裸机系统(包括 ARM Linux 的 boot、kernel,不适用编译 Linux 应用 Application),一般适合 ARM7、Cortex-M 和 Cortex-R 内核的芯片使用,所以不支持那些跟操作系统关系密切的函数。

2. arm-none-linux-gnueabi-gcc

(ARM architecture, no vendor, creates binaries that run on the Linux operating system,and uses the GNU EABI)主要用于基于ARM架构的Linux系统,可用于编译 ARM 架构的 u-boot、Linux内核、linux应用等。arm-none-linux-gnueabi基于GCC,使用Glibc库,经过 Codesourcery 公司优化过推出的编译器。arm-none-linux-gnueabi-xxx 交叉编译工具的浮点运算非常优秀。一般ARM9、ARM11、Cortex-A 内核,带有 Linux 操作系统的会用到。

3. ABI 和 EABI 区别

ABI:二进制应用程序接口(Application Binary Interface (ABI) for the ARM Architecture)。在计算机中,应用二进制接口描述了应用程序(或者其他类型)和操作系统之间或其他应用程序的低级接口。
EABI:嵌入式ABI。嵌入式应用二进制接口指定了文件格式、数据类型、寄存器使用、堆积组织优化和在一个嵌入式软件中的参数的标准约定。开发者使用自己的汇编语言也可以使用 EABI 作为与兼容的编译器生成的汇编语言的接口。
两者主要区别是,ABI是计算机上的,EABI是嵌入式平台上(如ARM,MIPS等)。

4. arm-linux-gnueabi-gcc 和 arm-linux-gnueabihf-gcc

两个交叉编译器分别适用于 armel 和 armhf 两个不同的架构,armel 和 armhf 这两种架构在对待浮点运算采取了不同的策略(有 fpu 的 arm 才能支持这两种浮点运算策略)。
这两个交叉编译器是 gcc 的选项 -mfloat-abi 的默认值不同。gcc 的选项 -mfloat-abi 有三种值 soft、softfp、hard(其中后两者都要求 arm 里有 fpu 浮点运算单元,soft 与后两者是兼容的,但 softfp 和 hard 两种模式互不兼容):
soft: 不用fpu进行浮点计算,即使有fpu浮点运算单元也不用,而是使用软件模式。
softfp: armel架构(对应的编译器为 arm-linux-gnueabi-gcc )采用的默认值,用fpu计算,但是传参数用普通寄存器传,这样中断的时候,只需要保存普通寄存器,中断负荷小,但是参数需要转换成浮点的再计算。
hard: armhf架构(对应的编译器 arm-linux-gnueabihf-gcc )采用的默认值,用fpu计算,传参数也用fpu中的浮点寄存器传,省去了转换,性能最好,但是中断负荷高。

一些实践

stm32mp157编译 tf-a-2.2,u-boot-2020.01-r0,linux5.4.31

tf-a (Truested Firmware-A)

开发环境

        系统环境:Ubuntu 18.04

        编译器 :gcc-arm-9.2-2019.12-x86_64-arm-none-linux-gnueabihf 配置环境变量(略)

        stm32swrapper4dbg:生成tf-a必须用到的,安装gcc,cmake后编译源码,将文件cp到 /usr/bin 目录下;

        在当前目录新建一个Makefile.sdk ,使用正点原子提供的会提示 Boot interface 6 not supported, 以下内容是修改了正点原子提供的Makefile脚本

        tf-a: 正点原子官方提供修改好的源码

    ST公司官方用的交叉编译器是“arm-ostl-linux-gnueabi-gcc”;

    正点原子用的交叉编译器是“arm-none-linux-gnueabihf-gcc”

    将EXTRA_OEMAKE=CROSS_COMPILE=arm-none-linux-gnueabihf- DEBUG=1 LOG_LEVEL=40 PLAT=stm32mp1 ARCH=aarch32 ARM_ARCH_MAJOR=7     STM32MP_SDMMC=1 STM32MP_EMMC=1 STM32MP_SPI_NOR=1 STM32MP_RAW_NAND=1 STM32MP_SPI_NAND=1

    EXTRA_OEMAKE_SERIAL=$(filter-out STM32MP_SDMMC=1 STM32MP_EMMC=1 STM32MP_SPI_NOR=1 STM32MP_RAW_NAND=1     STM32MP_SPI_NAND=1,$(EXTRA_OEMAKE)) STM32MP_UART_PROGRAMMER=1 STM32MP_USB_PROGRAMMER=1

    将“TFA_DEVICETREE ?= stm32mp157a-dk1 stm32mp157d-dk1 stm32mp157c-dk2 stm32mp157f-dk2 stm32mp157c-ed1 stm32mp157f-ed1               stm32mp157a-ev1 stm32mp157c-ev1 stm32mp157d-ev1 stm32mp157f-ev1 stm32mp157d-atk”注释掉,只用“TFA_DEVICETREE ?=     stm32mp157d-   atk”,    目的是:关闭多个STM32MP1开发板的TF-A镜像,只保留正点原子的开发板的TF-A镜像。

#remove default variable
LDFLAGS=
CFLAGS=
CPPFLAGS=
CC=
CPP=
AS=
AR=
LD=
NM=

LOCAL_PATH=$(PWD)

EXTRA_OEMAKE=CROSS_COMPILE=arm-none-linux-gnueabihf- DEBUG=1 LOG_LEVEL=40 PLAT=stm32mp1 ARCH=aarch32 ARM_ARCH_MAJOR=7 STM32MP_SDMMC=1 STM32MP_EMMC=1 STM32MP_SPI_NOR=1 STM32MP_RAW_NAND=1 STM32MP_SPI_NAND=1
# EXTRA_OEMAKE_SERIAL= STM32MP_UART_PROGRAMMER=1 STM32MP_USB_PROGRAMMER=1
EXTRA_OEMAKE_SERIAL=$(filter-out STM32MP_SDMMC=1 STM32MP_EMMC=1 STM32MP_SPI_NOR=1 STM32MP_RAW_NAND=1 STM32MP_SPI_NAND=1,$(EXTRA_OEMAKE)) STM32MP_UART_PROGRAMMER=1 STM32MP_USB_PROGRAMMER=1

# Set default config
ELF_DEBUG_ENABLE ?= 1
TF_A_CONFIG ?= trusted optee serialboot

# Set specific OEMAKE config
TF_A_CONFIG_OEMAKE = trusted,"AARCH32_SP=sp_min" optee,"AARCH32_SP=optee" serialboot,"AARCH32_SP=sp_min"
# Set default TFA_DEVICETREE
TFA_DEVICETREE ?= stm32mp157d-atk

#Set default TF_A_ENABLE_DEBUG_WRAPPER
TF_A_ENABLE_DEBUG_WRAPPER ?= 1

help:
@echo
@echo "Available targets:"
@echo " all : build TF-A binaries for defined config(s)"
@echo " clean : clean build directories from generated files"
@echo
@echo "TF-A configuration:"
@echo " TF_A_CONFIG = $(TF_A_CONFIG)"
@echo " TFA_DEVICETREE = $(TFA_DEVICETREE)"
@echo " ELF_DEBUG_ENABLE = '$(ELF_DEBUG_ENABLE)' ('1' to export elf files)"
@echo " TF_A_ENABLE_DEBUG_WRAPPER = '$(TF_A_ENABLE_DEBUG_WRAPPER)' ('1' to generate tf-a for debugging)"
@echo

all: tf

host_tools:
@$(MAKE) --no-print-directory -C $(LOCAL_PATH)/tools/stm32image

tf: host_tools
for config in $(TF_A_CONFIG) ; do \
# Init any extraoemake \
add_extraoemake= ; \
for fullconfig in $(TF_A_CONFIG_OEMAKE) ; do \
extraconfig=$$(echo $$fullconfig | cut -d',' -f1) ; \
if [ "$$extraconfig" = "$$config" ]; then \
add_extraoemake=$$(echo $$fullconfig | cut -d',' -f2) ; \
fi ; \
done ; \
mkdir -p $(LOCAL_PATH)/../build/$$config ; \
if test -n "$(TFA_DEVICETREE)" ; then \
for dt in $(TFA_DEVICETREE) ; do \
if [ "$(TF_A_CONFIG)" != "serialboot" ]; then \
$(MAKE) $(EXTRA_OEMAKE) -C $(LOCAL_PATH) DTB_FILE_NAME=$$dt.dtb BUILD_PLAT=$(LOCAL_PATH)/../build/$$config $$add_extraoemake ; \
else \
$(MAKE) $(EXTRA_OEMAKE_SERIAL) -C $(LOCAL_PATH) DTB_FILE_NAME=$$dt.dtb BUILD_PLAT=$(LOCAL_PATH)/../build/$$config $$add_extraoemake ; \
fi \
# Copy binary file with explicit name \
cp -f $(LOCAL_PATH)/../build/$$config/tf-a-$$dt.stm32 $(LOCAL_PATH)/../build/$$config/tf-a-$$dt-$$config.stm32 ; \
if [ "$(TF_A_ENABLE_DEBUG_WRAPPER)" = "1" ]; then \
# Generate wrapper for debugging \
stm32wrapper4dbg -s $(LOCAL_PATH)/../build/$$config/tf-a-$$dt.stm32 -d $(LOCAL_PATH)/../build/$$config/debug-tf-a-$$dt-$$config.stm32 ; \
fi \
done ; \
else \
$(MAKE) $(EXTRA_OEMAKE) -C $(LOCAL_PATH) BUILD_PLAT=$(LOCAL_PATH)/../build/$$config $$add_extraoemake; \
tf_version=$$(find $(LOCAL_PATH)/../build/$$config -name tf-a*.stm32 -exec basename {} \; | sed "s/\.stm32//") ; \
# Copy binary file with explicit name \
cp -f $(LOCAL_PATH)/../build/$$config/$$tf_version.stm32 $(LOCAL_PATH)/../build/$$config/$$tf_version-$$config.stm32 ; \
if [ "$(TF_A_ENABLE_DEBUG_WRAPPER)" = "1" ]; then \
# Generate wrapper for debugging \
stm32wrapper4dbg -s $(LOCAL_PATH)/../build/$$config/$$tf_version.stm32 $(LOCAL_PATH)/../build/$$config/debug-$$tf_version-$$config.stm32 ; \
fi \
fi ; \
# Copy elf files with explicit name \
if [ "$(ELF_DEBUG_ENABLE)" = "1" ] ; then \
if [ -f $(LOCAL_PATH)/../build/$$config/bl2/bl2.elf ] ; then \
cp -f $(LOCAL_PATH)/../build/$$config/bl2/bl2.elf $(LOCAL_PATH)/../build/$$config/tf-a-bl2-$$config.elf ; \
fi ; \
if [ -f $(LOCAL_PATH)/../build/$$config/bl32/bl32.elf ] ; then \
cp -f $(LOCAL_PATH)/../build/$$config/bl32/bl32.elf $(LOCAL_PATH)/../build/$$config/tf-a-bl32-$$config.elf ; \
fi ; \
fi ; \
done

clean:
@for config in $(TF_A_CONFIG) ; do \
rm -rf $(LOCAL_PATH)/../build/$$config ; \
done


单独编译生成“tf-a-stm32mp157d-atk-serialboot.stm32”

        输入“cd tf-a-stm32mp-2.2.r1/回车”,进入“tf-a-stm32mp-2.2.r1”目录下,


        输入“make -f ../Makefile.sdk clean回车”,清除以前的编译

        输入“make -f ../Makefile.sdk TFA_DEVICETREE=stm32mp157d-atk TF_A_CONFIG=serialboot ELF_DEBUG_ENABLE='1' all -j回车”,要求单独生成“tf-a-stm32mp157d-atk-serialboot.stm32”,这一句非常重要。

注意:不能使用“make -f ../Makefile.sdk all回车”来编译,否则在烧录程序时串口会报“Boot interface 6 not supported”问题。
cd build 里找到编译后生成的  tf-a-stm32mp157d-atk-serialboot.stm32 文件 (该文件是烧录到板卡的其中一个文件)


移植 TF-A 到 目标板卡上

    移植前准备:在st官网st适配其芯片的tf-a源码

    编译测试:修改 Makefile.sdk中的编译器为 arm-none-linux-gnueabihf- 

    编译命令:    make -f ../Makefile.sdk all -j12

    成功? 编译成功会在当前目录的上一级出现build文件夹,里面会包含编译生成的tf-a固件

    

    开始移植:

        cp stm32mp157d-ed1.dts stm32mp157d-atk.dts

        修改 Makefile.sdk 中的 FA_DEVICETREE ?= stm32mp157a-dk1 这一行,添加 stm32mp157d-atk

// SPDX-License-Identifier: (GPL-2.0+ OR BSD-3-Clause)
/*
* Copyright (C) STMicroelectronics 2019 - All Rights Reserved
* Author: Alexandre Torgue <alexandre.torgue@st.com> for STMicroelectronics.
*/
/dts-v1/;

#include "stm32mp157.dtsi"
#include "stm32mp15xd.dtsi"
#include "stm32mp15-pinctrl.dtsi"
#include "stm32mp15xxaa-pinctrl.dtsi"
#include "stm32mp157d-atk.dtsi"
#include <dt-bindings/soc/st,stm32-etzpc.h>

/ {
model = "STMicroelectronics STM32MP157D eval daughter by leeyangy 2024/03/15 20:40:00";
compatible = "st,stm32mp157d-atk", "st,stm32mp157";

chosen {
stdout-path = "serial0:115200n8";
};

aliases {
serial0 = &uart4;
};
};

&cpu1 {
cpu-supply = <&vddcore>;
};

&etzpc {
st,decprot = <
DECPROT(STM32MP1_ETZPC_USART1_ID, DECPROT_NS_RW, DECPROT_UNLOCK)
DECPROT(STM32MP1_ETZPC_SPI6_ID, DECPROT_NS_RW, DECPROT_UNLOCK)
DECPROT(STM32MP1_ETZPC_I2C4_ID, DECPROT_NS_RW, DECPROT_UNLOCK)
DECPROT(STM32MP1_ETZPC_I2C6_ID, DECPROT_NS_RW, DECPROT_UNLOCK)
DECPROT(STM32MP1_ETZPC_RNG1_ID, DECPROT_NS_RW, DECPROT_UNLOCK)
DECPROT(STM32MP1_ETZPC_HASH1_ID, DECPROT_NS_RW, DECPROT_UNLOCK)
DECPROT(STM32MP1_ETZPC_DDRCTRL_ID, DECPROT_S_RW, DECPROT_LOCK)
DECPROT(STM32MP1_ETZPC_DDRPHYC_ID, DECPROT_S_RW, DECPROT_LOCK)
DECPROT(STM32MP1_ETZPC_STGENC_ID, DECPROT_S_RW, DECPROT_LOCK)
DECPROT(STM32MP1_ETZPC_BKPSRAM_ID, DECPROT_S_RW, DECPROT_LOCK)
DECPROT(STM32MP1_ETZPC_IWDG1_ID, DECPROT_S_RW, DECPROT_LOCK)
>;
};


        cp stm32mp15xx-edx.dtsi stm32mp157d-atk.dtsi

        删除 或 添加  stm32mp157d-atk.dtsi 自己设备特有的信息节点

        比如说 vin,i2c...

// SPDX-License-Identifier: (GPL-2.0+ OR BSD-3-Clause)
/*
* Copyright (C) STMicroelectronics 2017 - All Rights Reserved
* Author: Ludovic Barre <ludovic.barre@st.com> for STMicroelectronics.
*/

#include <dt-bindings/clock/stm32mp1-clksrc.h>
#include <dt-bindings/power/stm32mp1-power.h>
#include "stm32mp15-ddr3-2x4Gb-1066-binG.dtsi"

/ {
memory@c0000000 {
device_type = "memory";
reg = <0xC0000000 0x40000000>;
};

/* 内核电压 */
vddcore: regulator-vddcore {
compatible = "regulator-fixed";
regulator-name = "vddcore";
regulator-min-microvolt = <1200000>;
regulator-max-microvolt = <1350000>;
regulator-off-in-suspend;
regulator-always-on;
};

vdd_ddr: regulator-vdd-ddr {
compatible = "regulator-fixed";
regulator-name = "vdd_ddr";
regulator-min-microvolt = <1350000>;
regulator-max-microvolt = <1350000>;
regulator-off-in-suspend;
regulator-always-on;
};

vdda: regulator-vvdda {
compatible = "regulator-fixed";
regulator-name = "vdda";
regulator-min-microvolt = <2900000>;
regulator-max-microvolt = <2900000>;
regulator-off-in-suspend;
regulator-always-on;
};

vtt_ddr: regulator-vtt-ddr {
compatible = "regulator-fixed";
regulator-name = "vtt_ddr";
regulator-min-microvolt = <500000>;
regulator-max-microvolt = <750000>;
regulator-off-in-suspend;
regulator-always-on;
};

/* 3.3v 电压 */
v3v3: regulator-3p3v {
compatible = "regulator-fixed";
regulator-name = "v3v3";
regulator-min-microvolt = <3300000>;
regulator-max-microvolt = <3300000>;
regulator-off-in-suspend;
regulator-always-on;
};

v1v8_audio: regulator-v1v8-audio {
compatible = "regulator-fixed";
regulator-name = "v1v8_audio";
regulator-min-microvolt = <1800000>;
regulator-max-microvolt = <1800000>;
regulator-off-in-suspend;
regulator-always-on;
};

v3v3_hdmi: regulator-v3v3-hdmi {
compatible = "regulator-fixed";
regulator-name = "v3v3_hdmi";
regulator-min-microvolt = <3300000>;
regulator-max-microvolt = <3300000>;
regulator-off-in-suspend;
regulator-always-on;
};

v1v2_hdmi: regulator-v1v2-hdmi {
compatible = "regulator-fixed";
regulator-name = "v1v2_hdmi";
regulator-min-microvolt = <1200000>;
regulator-max-microvolt = <1200000>;
regulator-off-in-suspend;
regulator-always-on;
};

/* 电源 3.3v */
vdd: regulator-vdd {
compatible = "regulator-fixed";
regulator-name = "vdd";
regulator-min-microvolt = <3300000>;
regulator-max-microvolt = <3300000>;
regulator-off-in-suspend;
regulator-always-on;
};

/* usb电源 3.3v */
vdd_usb: regulator-vdd-usb {
compatible = "regulator-fixed";
regulator-name = "vdd_usb";
regulator-min-microvolt = <3300000>;
regulator-max-microvolt = <3300000>;
regulator-off-in-suspend;
regulator-always-on;
};

v2v8: regulator-v2v8 {
compatible = "regulator-fixed";
regulator-name = "v2v8";
regulator-min-microvolt = <2800000>;
regulator-max-microvolt = <2800000>;
regulator-off-in-suspend;
regulator-always-on;
};
};

&bsec {
board_id: board_id@ec {
reg = <0xec 0x4>;
st,non-secure-otp;
};
};

&clk_hse {
st,digbypass;
};

&cpu0{
cpu-supply = <&vddcore>;
};

&hash1 {
status = "okay";
};

&i2c4 {
pinctrl-names = "default";
pinctrl-0 = <&i2c4_pins_a>;
i2c-scl-rising-time-ns = <185>;
i2c-scl-falling-time-ns = <20>;
clock-frequency = <400000>;
status = "okay";
secure-status = "okay";
};

&iwdg2 {
timeout-sec = <32>;
status = "okay";
secure-status = "okay";
};

&nvmem_layout {
nvmem-cells = <&cfg0_otp>,
<&part_number_otp>,
<&monotonic_otp>,
<&nand_otp>,
<&uid_otp>,
<&package_otp>,
<&hw2_otp>,
<&pkh_otp>,
<&board_id>;

nvmem-cell-names = "cfg0_otp",
"part_number_otp",
"monotonic_otp",
"nand_otp",
"uid_otp",
"package_otp",
"hw2_otp",
"pkh_otp",
"board_id";
};

&pwr_regulators {
system_suspend_supported_soc_modes = <
STM32_PM_CSLEEP_RUN
STM32_PM_CSTOP_ALLOW_LP_STOP
STM32_PM_CSTOP_ALLOW_LPLV_STOP
STM32_PM_CSTOP_ALLOW_STANDBY_DDR_SR
>;
system_off_soc_mode = <STM32_PM_CSTOP_ALLOW_STANDBY_DDR_OFF>;
vdd-supply = <&vdd>;
vdd_3v3_usbfs-supply = <&vdd_usb>;
};

&rcc {
st,hsi-cal;
st,csi-cal;
st,cal-sec = <60>;
st,clksrc = <
CLK_MPU_PLL1P
CLK_AXI_PLL2P
CLK_MCU_PLL3P
CLK_PLL12_HSE
CLK_PLL3_HSE
CLK_PLL4_HSE
CLK_RTC_LSE
CLK_MCO1_DISABLED
CLK_MCO2_DISABLED
>;

st,clkdiv = <
1 /*MPU*/
0 /*AXI*/
0 /*MCU*/
1 /*APB1*/
1 /*APB2*/
1 /*APB3*/
1 /*APB4*/
2 /*APB5*/
23 /*RTC*/
0 /*MCO1*/
0 /*MCO2*/
>;

st,pkcs = <
CLK_CKPER_HSE
CLK_FMC_ACLK
CLK_QSPI_ACLK
CLK_ETH_DISABLED
CLK_SDMMC12_PLL4P
CLK_DSI_DSIPLL
CLK_STGEN_HSE
CLK_USBPHY_HSE
CLK_SPI2S1_PLL3Q
CLK_SPI2S23_PLL3Q
CLK_SPI45_HSI
CLK_SPI6_HSI
CLK_I2C46_HSI
CLK_SDMMC3_PLL4P
CLK_USBO_USBPHY
CLK_ADC_CKPER
CLK_CEC_LSE
CLK_I2C12_HSI
CLK_I2C35_HSI
CLK_UART1_HSI
CLK_UART24_HSI
CLK_UART35_HSI
CLK_UART6_HSI
CLK_UART78_HSI
CLK_SPDIF_PLL4P
CLK_FDCAN_PLL4R
CLK_SAI1_PLL3Q
CLK_SAI2_PLL3Q
CLK_SAI3_PLL3Q
CLK_SAI4_PLL3Q
CLK_RNG1_LSI
CLK_RNG2_LSI
CLK_LPTIM1_PCLK1
CLK_LPTIM23_PCLK3
CLK_LPTIM45_LSE
>;

/* VCO = 1066.0 MHz => P = 266 (AXI), Q = 533 (GPU), R = 533 (DDR) */
pll2: st,pll@1 {
compatible = "st,stm32mp1-pll";
reg = <1>;
cfg = <2 65 1 0 0 PQR(1,1,1)>;
frac = <0x1400>;
};

/* VCO = 417.8 MHz => P = 209, Q = 24, R = 11 */
pll3: st,pll@2 {
compatible = "st,stm32mp1-pll";
reg = <2>;
cfg = <1 33 1 16 36 PQR(1,1,1)>;
frac = <0x1a04>;
};

/* VCO = 594.0 MHz => P = 99, Q = 74, R = 74 */
pll4: st,pll@3 {
compatible = "st,stm32mp1-pll";
reg = <3>;
cfg = <3 98 5 7 7 PQR(1,1,1)>;
};
};

&rng1 {
status = "okay";
secure-status = "okay";
};

&rtc {
status = "okay";
secure-status = "okay";
};

&sdmmc1 {
pinctrl-names = "default";
pinctrl-0 = <&sdmmc1_b4_pins_a &sdmmc1_dir_pins_a>;
st,neg-edge;
broken-cd;
bus-width = <4>;
vmmc-supply = <&v3v3>;
status = "okay";
};

&sdmmc2 {
pinctrl-names = "default";
pinctrl-0 = <&sdmmc2_b4_pins_a &sdmmc2_d47_pins_a>;
non-removable;
st,neg-edge;
bus-width = <8>;
vmmc-supply = <&v3v3>;
vqmmc-supply = <&v3v3>;
status = "okay";
};

&timers15 {
secure-status = "okay";
st,hsi-cal-input = <7>;
st,csi-cal-input = <8>;
};

&uart4 {
pinctrl-names = "default";
pinctrl-0 = <&uart4_pins_a>;
status = "okay";
};

&usbotg_hs {
phys = <&usbphyc_port1 0>;
phy-names = "usb2-phy";
usb-role-switch;
status = "okay";
};

&usbphyc {
status = "okay";
};

&usbphyc_port0 {
phy-supply = <&vdd_usb>;
};

&usbphyc_port1 {
phy-supply = <&vdd_usb>;
};


总结 就是 修改 设备树


u-boot 移植


编译正点原子提供的源码进行环境测试

解压源码-编译...

make distclean
make ARCH=arm CROSS_COMPILE=arm-none-linux-gnueabihf- stm32mp157d_atk_defconfig
make V=1 ARCH=arm CROSS_COMPILER=arm-none-linux-gnueabihf- DEVICE_TREE=stm32mp157d-atk all

以上步骤简化:

make stm32mp157d_atk_defconfig
make DEVICE_TREE=stm32mp157d-atk all -j12


修改源码路径下的makefile文件

添加 

ARCH=arm
CROSS_COMPILE = arm-none-linux-gnueabihf-


最后文件内容如下:

# SPDX-License-Identifier: GPL-2.0+

VERSION = 2020
PATCHLEVEL = 01
SUBLEVEL =
EXTRAVERSION = -stm32mp-r1
NAME =

# *DOCUMENTATION*
# To see a list of typical targets execute "make help"
# More info can be located in ./README
# Comments in this file are targeted only to the developer, do not
# expect to learn how to build the kernel reading this file.

# o Do not use make's built-in rules and variables
# (this increases performance and avoids hard-to-debug behaviour);
# o Look for make include files relative to root of kernel src
MAKEFLAGS += -rR --include-dir=$(CURDIR)

# Determine host architecture
include include/host_arch.h
MK_ARCH="${shell uname -m}"
unexport HOST_ARCH
ifeq ("x86_64", $(MK_ARCH))
export HOST_ARCH=$(HOST_ARCH_X86_64)
else ifneq (,$(findstring $(MK_ARCH), "i386" "i486" "i586" "i686"))
export HOST_ARCH=$(HOST_ARCH_X86)
else ifneq (,$(findstring $(MK_ARCH), "aarch64" "armv8l"))
export HOST_ARCH=$(HOST_ARCH_AARCH64)
else ifeq ("armv7l", $(MK_ARCH))
export HOST_ARCH=$(HOST_ARCH_ARM)
else ifeq ("riscv32", $(MK_ARCH))
export HOST_ARCH=$(HOST_ARCH_RISCV32)
else ifeq ("riscv64", $(MK_ARCH))
export HOST_ARCH=$(HOST_ARCH_RISCV64)
endif
undefine MK_ARCH

# Avoid funny character set dependencies
unexport LC_ALL
LC_COLLATE=C
LC_NUMERIC=C
export LC_COLLATE LC_NUMERIC

# Avoid interference with shell env settings
unexport GREP_OPTIONS

# We are using a recursive build, so we need to do a little thinking
# to get the ordering right.
#
# Most importantly: sub-Makefiles should only ever modify files in
# their own directory. If in some directory we have a dependency on
# a file in another dir (which doesn't happen often, but it's often
# unavoidable when linking the built-in.o targets which finally
# turn into vmlinux), we will call a sub make in that other dir, and
# after that we are sure that everything which is in that other dir
# is now up to date.
#
# The only cases where we need to modify files which have global
# effects are thus separated out and done before the recursive
# descending is started. They are now explicitly listed as the
# prepare rule.

# Beautify output
# ---------------------------------------------------------------------------
#
# Normally, we echo the whole command before executing it. By making
# that echo $($(quiet)$(cmd)), we now have the possibility to set
# $(quiet) to choose other forms of output instead, e.g.
#
# quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
# cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $<
#
# If $(quiet) is empty, the whole command will be printed.
# If it is set to "quiet_", only the short version will be printed.
# If it is set to "silent_", nothing will be printed at all, since
# the variable $(silent_cmd_cc_o_c) doesn't exist.
#
# A simple variant is to prefix commands with $(Q) - that's useful
# for commands that shall be hidden in non-verbose mode.
#
# $(Q)ln $@ :<
#
# If KBUILD_VERBOSE equals 0 then the above command will be hidden.
# If KBUILD_VERBOSE equals 1 then the above command is displayed.
#
# To put more focus on warnings, be less verbose as default
# Use 'make V=1' to see the full commands

ifeq ("$(origin V)", "command line")
KBUILD_VERBOSE = $(V)
endif
ifndef KBUILD_VERBOSE
KBUILD_VERBOSE = 0
endif

ifeq ($(KBUILD_VERBOSE),1)
quiet =
Q =
else
quiet=quiet_
Q = @
endif

# If the user is running make -s (silent mode), suppress echoing of
# commands

ifneq ($(filter 4.%,$(MAKE_VERSION)),) # make-4
ifneq ($(filter %s ,$(firstword x$(MAKEFLAGS))),)
quiet=silent_
endif
else # make-3.8x
ifneq ($(filter s% -s%,$(MAKEFLAGS)),)
quiet=silent_
endif
endif

export quiet Q KBUILD_VERBOSE

# kbuild supports saving output files in a separate directory.
# To locate output files in a separate directory two syntaxes are supported.
# In both cases the working directory must be the root of the kernel src.
# 1) O=
# Use "make O=dir/to/store/output/files/"
#
# 2) Set KBUILD_OUTPUT
# Set the environment variable KBUILD_OUTPUT to point to the directory
# where the output files shall be placed.
# export KBUILD_OUTPUT=dir/to/store/output/files/
# make
#
# The O= assignment takes precedence over the KBUILD_OUTPUT environment
# variable.

# KBUILD_SRC is set on invocation of make in OBJ directory
# KBUILD_SRC is not intended to be used by the regular user (for now)
ifeq ($(KBUILD_SRC),)

# OK, Make called in directory where kernel src resides
# Do we want to locate output files in a separate directory?
ifeq ("$(origin O)", "command line")
KBUILD_OUTPUT := $(O)
endif

# That's our default target when none is given on the command line
PHONY := _all
_all:

# Cancel implicit rules on top Makefile
$(CURDIR)/Makefile Makefile: ;

ifneq ($(KBUILD_OUTPUT),)
# Invoke a second make in the output directory, passing relevant variables
# check that the output directory actually exists
saved-output := $(KBUILD_OUTPUT)
KBUILD_OUTPUT := $(shell mkdir -p $(KBUILD_OUTPUT) && cd $(KBUILD_OUTPUT) \
&& /bin/pwd)
$(if $(KBUILD_OUTPUT),, \
$(error failed to create output directory "$(saved-output)"))

PHONY += $(MAKECMDGOALS) sub-make

$(filter-out _all sub-make $(CURDIR)/Makefile, $(MAKECMDGOALS)) _all: sub-make
@:

sub-make: FORCE
$(Q)$(MAKE) -C $(KBUILD_OUTPUT) KBUILD_SRC=$(CURDIR) \
-f $(CURDIR)/Makefile $(filter-out _all sub-make,$(MAKECMDGOALS))

# Leave processing to above invocation of make
skip-makefile := 1
endif # ifneq ($(KBUILD_OUTPUT),)
endif # ifeq ($(KBUILD_SRC),)

# We process the rest of the Makefile if this is the final invocation of make
ifeq ($(skip-makefile),)

# Do not print "Entering directory ...",
# but we want to display it when entering to the output directory
# so that IDEs/editors are able to understand relative filenames.
MAKEFLAGS += --no-print-directory

# Call a source code checker (by default, "sparse") as part of the
# C compilation.
#
# Use 'make C=1' to enable checking of only re-compiled files.
# Use 'make C=2' to enable checking of *all* source files, regardless
# of whether they are re-compiled or not.
#
# See the file "doc/sparse.txt" for more details, including
# where to get the "sparse" utility.

ifeq ("$(origin C)", "command line")
KBUILD_CHECKSRC = $(C)
endif
ifndef KBUILD_CHECKSRC
KBUILD_CHECKSRC = 0
endif

# Use make M=dir to specify directory of external module to build
# Old syntax make ... SUBDIRS=$PWD is still supported
# Setting the environment variable KBUILD_EXTMOD take precedence
ifdef SUBDIRS
KBUILD_EXTMOD ?= $(SUBDIRS)
endif

ifeq ("$(origin M)", "command line")
KBUILD_EXTMOD := $(M)
endif

# If building an external module we do not care about the all: rule
# but instead _all depend on modules
PHONY += all
ifeq ($(KBUILD_EXTMOD),)
_all: all
else
_all: modules
endif

ifeq ($(KBUILD_SRC),)
# building in the source tree
srctree := .
else
ifeq ($(KBUILD_SRC)/,$(dir $(CURDIR)))
# building in a subdirectory of the source tree
srctree := ..
else
srctree := $(KBUILD_SRC)
endif
endif
objtree := .
src := $(srctree)
obj := $(objtree)

VPATH := $(srctree)$(if $(KBUILD_EXTMOD),:$(KBUILD_EXTMOD))

export srctree objtree VPATH

# Make sure CDPATH settings don't interfere
unexport CDPATH

#########################################################################

HOSTARCH := $(shell uname -m | \
sed -e s/i.86/x86/ \
-e s/sun4u/sparc64/ \
-e s/arm.*/arm/ \
-e s/sa110/arm/ \
-e s/ppc64/powerpc/ \
-e s/ppc/powerpc/ \
-e s/macppc/powerpc/\
-e s/sh.*/sh/)

HOSTOS := $(shell uname -s | tr '[:upper:]' '[:lower:]' | \
sed -e 's/\(cygwin\).*/cygwin/')

export HOSTARCH HOSTOS

#########################################################################

# set default to nothing for native builds
ifeq ($(HOSTARCH),$(ARCH))
CROSS_COMPILE ?=
endif

ARCH=arm
CROSS_COMPILE = arm-none-linux-gnueabihf-

KCONFIG_CONFIG ?= .config
export KCONFIG_CONFIG

# SHELL used by kbuild
CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
else if [ -x /bin/bash ]; then echo /bin/bash; \
else echo sh; fi ; fi)

HOSTCC = cc
HOSTCXX = c++
HOSTCFLAGS = -Wall -Wstrict-prototypes -O2 -fomit-frame-pointer \
$(if $(CONFIG_TOOLS_DEBUG),-g)
HOSTCXXFLAGS = -O2

# With the move to GCC 6, we have implicitly upgraded our language
# standard to GNU11 (see https://gcc.gnu.org/gcc-5/porting_to.html).
# Some Linux distributions (including RHEL7, SLES13, Debian 8) still
# have older compilers as their default, so we make it explicit for
# these that our host tools are GNU11 (i.e. C11 w/ GNU extensions).
CSTD_FLAG := -std=gnu11
ifeq ($(HOSTOS),linux)
HOSTCFLAGS += $(CSTD_FLAG)
endif

ifeq ($(HOSTOS),cygwin)
HOSTCFLAGS += -ansi
endif

# Mac OS X / Darwin's C preprocessor is Apple specific. It
# generates numerous errors and warnings. We want to bypass it
# and use GNU C's cpp. To do this we pass the -traditional-cpp
# option to the compiler. Note that the -traditional-cpp flag
# DOES NOT have the same semantics as GNU C's flag, all it does
# is invoke the GNU preprocessor in stock ANSI/ISO C fashion.
#
# Apple's linker is similar, thanks to the new 2 stage linking
# multiple symbol definitions are treated as errors, hence the
# -multiply_defined suppress option to turn off this error.
#
ifeq ($(HOSTOS),darwin)
# get major and minor product version (e.g. '10' and '6' for Snow Leopard)
DARWIN_MAJOR_VERSION = $(shell sw_vers -productVersion | cut -f 1 -d '.')
DARWIN_MINOR_VERSION = $(shell sw_vers -productVersion | cut -f 2 -d '.')

os_x_before = $(shell if [ $(DARWIN_MAJOR_VERSION) -le $(1) -a \
$(DARWIN_MINOR_VERSION) -le $(2) ] ; then echo "$(3)"; else echo "$(4)"; fi ;)

os_x_after = $(shell if [ $(DARWIN_MAJOR_VERSION) -ge $(1) -a \
$(DARWIN_MINOR_VERSION) -ge $(2) ] ; then echo "$(3)"; else echo "$(4)"; fi ;)

# Snow Leopards build environment has no longer restrictions as described above
HOSTCC = $(call os_x_before, 10, 5, "cc", "gcc")
HOSTCFLAGS += $(call os_x_before, 10, 4, "-traditional-cpp")
HOSTLDFLAGS += $(call os_x_before, 10, 5, "-multiply_defined suppress")

# since Lion (10.7) ASLR is on by default, but we use linker generated lists
# in some host tools which is a problem then ... so disable ASLR for these
# tools
HOSTLDFLAGS += $(call os_x_before, 10, 7, "", "-Xlinker -no_pie")

# macOS Mojave (10.14.X)
# Undefined symbols for architecture x86_64: "_PyArg_ParseTuple"
HOSTLDFLAGS += $(call os_x_after, 10, 14, "-lpython -dynamclib", "")
endif

# Decide whether to build built-in, modular, or both.
# Normally, just do built-in.

KBUILD_MODULES :=
KBUILD_BUILTIN := 1

# If we have only "make modules", don't compile built-in objects.
# When we're building modules with modversions, we need to consider
# the built-in objects during the descend as well, in order to
# make sure the checksums are up to date before we record them.

ifeq ($(MAKECMDGOALS),modules)
KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
endif

# If we have "make <whatever> modules", compile modules
# in addition to whatever we do anyway.
# Just "make" or "make all" shall build modules as well

# U-Boot does not need modules
#ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
# KBUILD_MODULES := 1
#endif

#ifeq ($(MAKECMDGOALS),)
# KBUILD_MODULES := 1
#endif

# Check ths size of a binary:
# Args:
# $1: File to check
# #2: Size limit in bytes (decimal or 0xhex)
define size_check
actual=$$( wc -c $1 | awk '{print $$1}'); \
limit=$$( printf "%d" $2 ); \
if test $$actual -gt $$limit; then \
echo "$1 exceeds file size limit:" >&2; \
echo " limit: $$(printf %#x $$limit) bytes" >&2; \
echo " actual: $$(printf %#x $$actual) bytes" >&2; \
echo " excess: $$(printf %#x $$((actual - limit))) bytes" >&2;\
exit 1; \
fi
endef
export size_check

export KBUILD_MODULES KBUILD_BUILTIN
export KBUILD_CHECKSRC KBUILD_SRC KBUILD_EXTMOD

# We need some generic definitions (do not try to remake the file).
scripts/Kbuild.include: ;
include scripts/Kbuild.include

# Make variables (CC, etc...)

AS = $(CROSS_COMPILE)as
# Always use GNU ld
ifneq ($(shell $(CROSS_COMPILE)ld.bfd -v 2> /dev/null),)
LD = $(CROSS_COMPILE)ld.bfd
else
LD = $(CROSS_COMPILE)ld
endif
CC = $(CROSS_COMPILE)gcc
CPP = $(CC) -E
AR = $(CROSS_COMPILE)ar
NM = $(CROSS_COMPILE)nm
LDR = $(CROSS_COMPILE)ldr
STRIP = $(CROSS_COMPILE)strip
OBJCOPY = $(CROSS_COMPILE)objcopy
OBJDUMP = $(CROSS_COMPILE)objdump
LEX = flex
YACC = bison
AWK = awk
PERL = perl
PYTHON ?= python
PYTHON2 = python2
PYTHON3 = python3
DTC ?= $(objtree)/scripts/dtc/dtc
CHECK = sparse

CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
-Wbitwise -Wno-return-void -D__CHECK_ENDIAN__ $(CF)

KBUILD_CPPFLAGS := -D__KERNEL__ -D__UBOOT__

KBUILD_CFLAGS := -Wall -Wstrict-prototypes \
-Wno-format-security \
-fno-builtin -ffreestanding $(CSTD_FLAG)
KBUILD_CFLAGS += -fshort-wchar -fno-strict-aliasing
KBUILD_AFLAGS := -D__ASSEMBLY__

# Don't generate position independent code
KBUILD_CFLAGS += $(call cc-option,-fno-PIE)
KBUILD_AFLAGS += $(call cc-option,-fno-PIE)

# Read UBOOTRELEASE from include/config/uboot.release (if it exists)
UBOOTRELEASE = $(shell cat include/config/uboot.release 2> /dev/null)
UBOOTVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION)

export VERSION PATCHLEVEL SUBLEVEL UBOOTRELEASE UBOOTVERSION
export ARCH CPU BOARD VENDOR SOC CPUDIR BOARDDIR
export CONFIG_SHELL HOSTCC HOSTCFLAGS HOSTLDFLAGS CROSS_COMPILE AS LD CC
export CPP AR NM LDR STRIP OBJCOPY OBJDUMP
export MAKE LEX YACC AWK PERL PYTHON PYTHON2 PYTHON3
export HOSTCXX HOSTCXXFLAGS CHECK CHECKFLAGS DTC DTC_FLAGS

export KBUILD_CPPFLAGS NOSTDINC_FLAGS UBOOTINCLUDE OBJCOPYFLAGS LDFLAGS
export KBUILD_CFLAGS KBUILD_AFLAGS

# When compiling out-of-tree modules, put MODVERDIR in the module
# tree rather than in the kernel tree. The kernel tree might
# even be read-only.
export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions

# Files to ignore in find ... statements

export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o \
-name CVS -o -name .pc -o -name .hg -o -name .git \) \
-prune -o
export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \
--exclude CVS --exclude .pc --exclude .hg --exclude .git

# ===========================================================================
# Rules shared between *config targets and build targets

# Basic helpers built in scripts/
PHONY += scripts_basic
scripts_basic:
$(Q)$(MAKE) $(build)=scripts/basic
$(Q)rm -f .tmp_quiet_recordmcount

# To avoid any implicit rule to kick in, define an empty command.
scripts/basic/%: scripts_basic ;

PHONY += outputmakefile
# outputmakefile generates a Makefile in the output directory, if using a
# separate output directory. This allows convenient use of make in the
# output directory.
outputmakefile:
ifneq ($(KBUILD_SRC),)
$(Q)ln -fsn $(srctree) source
$(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \
$(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)
endif

# To make sure we do not include .config for any of the *config targets
# catch them early, and hand them over to scripts/kconfig/Makefile
# It is allowed to specify more targets when calling make, including
# mixing *config targets and build targets.
# For example 'make oldconfig all'.
# Detect when mixed targets is specified, and make a second invocation
# of make so .config is not included in this case either (for *config).

version_h := include/generated/version_autogenerated.h
timestamp_h := include/generated/timestamp_autogenerated.h
defaultenv_h := include/generated/defaultenv_autogenerated.h

no-dot-config-targets := clean clobber mrproper distclean \
help %docs check% coccicheck \
ubootversion backup tests check qcheck

config-targets := 0
mixed-targets := 0
dot-config := 1

ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
dot-config := 0
endif
endif

ifeq ($(KBUILD_EXTMOD),)
ifneq ($(filter config %config,$(MAKECMDGOALS)),)
config-targets := 1
ifneq ($(words $(MAKECMDGOALS)),1)
mixed-targets := 1
endif
endif
endif

ifeq ($(mixed-targets),1)
# ===========================================================================
# We're called with mixed targets (*config and build targets).
# Handle them one by one.

PHONY += $(MAKECMDGOALS) __build_one_by_one

$(filter-out __build_one_by_one, $(MAKECMDGOALS)): __build_one_by_one
@:

__build_one_by_one:
$(Q)set -e; \
for i in $(MAKECMDGOALS); do \
$(MAKE) -f $(srctree)/Makefile $$i; \
done

else
ifeq ($(config-targets),1)
# ===========================================================================
# *config targets only - make sure prerequisites are updated, and descend
# in scripts/kconfig to make the *config target

KBUILD_DEFCONFIG := sandbox_defconfig
export KBUILD_DEFCONFIG KBUILD_KCONFIG

config: scripts_basic outputmakefile FORCE
$(Q)$(MAKE) $(build)=scripts/kconfig $@

%config: scripts_basic outputmakefile FORCE
$(Q)$(MAKE) $(build)=scripts/kconfig $@

else
# ===========================================================================
# Build targets only - this includes vmlinux, arch specific targets, clean
# targets and others. In general all targets except *config targets.

# Additional helpers built in scripts/
# Carefully list dependencies so we do not try to build scripts twice
# in parallel
PHONY += scripts
scripts: scripts_basic include/config/auto.conf
$(Q)$(MAKE) $(build)=$(@)

ifeq ($(dot-config),1)
# Read in config
-include include/config/auto.conf

# Read in dependencies to all Kconfig* files, make sure to run
# oldconfig if changes are detected.
-include include/config/auto.conf.cmd

# To avoid any implicit rule to kick in, define an empty command
$(KCONFIG_CONFIG) include/config/auto.conf.cmd: ;

# If .config is newer than include/config/auto.conf, someone tinkered
# with it and forgot to run make oldconfig.
# if auto.conf.cmd is missing then we are probably in a cleaned tree so
# we execute the config step to be sure to catch updated Kconfig files
include/config/%.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd
$(Q)$(MAKE) -f $(srctree)/Makefile syncconfig
@# If the following part fails, include/config/auto.conf should be
@# deleted so "make silentoldconfig" will be re-run on the next build.
$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.autoconf || \
{ rm -f include/config/auto.conf; false; }
@# include/config.h has been updated after "make silentoldconfig".
@# We need to touch include/config/auto.conf so it gets newer
@# than include/config.h.
@# Otherwise, 'make silentoldconfig' would be invoked twice.
$(Q)touch include/config/auto.conf

u-boot.cfg spl/u-boot.cfg tpl/u-boot.cfg:
$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.autoconf $(@)

-include include/autoconf.mk
-include include/autoconf.mk.dep

# We want to include arch/$(ARCH)/config.mk only when include/config/auto.conf
# is up-to-date. When we switch to a different board configuration, old CONFIG
# macros are still remaining in include/config/auto.conf. Without the following
# gimmick, wrong config.mk would be included leading nasty warnings/errors.
ifneq ($(wildcard $(KCONFIG_CONFIG)),)
ifneq ($(wildcard include/config/auto.conf),)
autoconf_is_old := $(shell find . -path ./$(KCONFIG_CONFIG) -newer \
include/config/auto.conf)
ifeq ($(autoconf_is_old),)
include config.mk
include arch/$(ARCH)/Makefile
endif
endif
endif

# These are set by the arch-specific config.mk. Make sure they are exported
# so they can be used when building an EFI application.
export EFI_LDS # Filename of EFI link script in arch/$(ARCH)/lib
export EFI_CRT0 # Filename of EFI CRT0 in arch/$(ARCH)/lib
export EFI_RELOC # Filename of EFU relocation code in arch/$(ARCH)/lib
export CFLAGS_EFI # Compiler flags to add when building EFI app
export CFLAGS_NON_EFI # Compiler flags to remove when building EFI app
export EFI_TARGET # binutils target if EFI is natively supported

# If board code explicitly specified LDSCRIPT or CONFIG_SYS_LDSCRIPT, use
# that (or fail if absent). Otherwise, search for a linker script in a
# standard location.

ifndef LDSCRIPT
#LDSCRIPT := $(srctree)/board/$(BOARDDIR)/u-boot.lds.debug
ifdef CONFIG_SYS_LDSCRIPT
# need to strip off double quotes
LDSCRIPT := $(srctree)/$(CONFIG_SYS_LDSCRIPT:"%"=%)
endif
endif

# If there is no specified link script, we look in a number of places for it
ifndef LDSCRIPT
ifeq ($(wildcard $(LDSCRIPT)),)
LDSCRIPT := $(srctree)/board/$(BOARDDIR)/u-boot.lds
endif
ifeq ($(wildcard $(LDSCRIPT)),)
LDSCRIPT := $(srctree)/$(CPUDIR)/u-boot.lds
endif
ifeq ($(wildcard $(LDSCRIPT)),)
LDSCRIPT := $(srctree)/arch/$(ARCH)/cpu/u-boot.lds
endif
endif

else
# Dummy target needed, because used as prerequisite
include/config/auto.conf: ;
endif # $(dot-config)

#
# Xtensa linker script cannot be preprocessed with -ansi because of
# preprocessor operations on strings that don't make C identifiers.
#
ifeq ($(CONFIG_XTENSA),)
LDPPFLAGS += -ansi
endif

ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
KBUILD_CFLAGS += -Os
else
KBUILD_CFLAGS += -O2
endif

KBUILD_CFLAGS += $(call cc-option,-fno-stack-protector)
KBUILD_CFLAGS += $(call cc-option,-fno-delete-null-pointer-checks)

# change __FILE__ to the relative path from the srctree
KBUILD_CFLAGS += $(call cc-option,-fmacro-prefix-map=$(srctree)/=)

KBUILD_CFLAGS += -g
# $(KBUILD_AFLAGS) sets -g, which causes gcc to pass a suitable -g<format>
# option to the assembler.
KBUILD_AFLAGS += -g

# Report stack usage if supported
# ARC tools based on GCC 7.1 has an issue with stack usage
# with naked functions, see commit message for more details
ifndef CONFIG_ARC
ifeq ($(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-stack-usage.sh $(CC)),y)
KBUILD_CFLAGS += -fstack-usage
endif
endif

KBUILD_CFLAGS += $(call cc-option,-Wno-format-nonliteral)
ifeq ($(cc-name),clang)
KBUILD_CPPFLAGS += $(call cc-option,-Qunused-arguments,)
KBUILD_CFLAGS += $(call cc-disable-warning, format-invalid-specifier)
KBUILD_CFLAGS += $(call cc-disable-warning, gnu)
KBUILD_CFLAGS += $(call cc-disable-warning, address-of-packed-member)
KBUILD_CFLAGS += $(call cc-option, -fcatch-undefined-behavior)
endif

# turn jbsr into jsr for m68k
ifeq ($(ARCH),m68k)
ifeq ($(findstring 3.4,$(shell $(CC) --version)),3.4)
KBUILD_AFLAGS += -Wa,-gstabs,-S
endif
endif

# Prohibit date/time macros, which would make the build non-deterministic
KBUILD_CFLAGS += $(call cc-option,-Werror=date-time)

include scripts/Makefile.extrawarn

# Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments
KBUILD_CPPFLAGS += $(KCPPFLAGS)
KBUILD_AFLAGS += $(KAFLAGS)
KBUILD_CFLAGS += $(KCFLAGS)

# Use UBOOTINCLUDE when you must reference the include/ directory.
# Needed to be compatible with the O= option
UBOOTINCLUDE := \
-Iinclude \
$(if $(KBUILD_SRC), -I$(srctree)/include) \
$(if $(CONFIG_$(SPL_)SYS_THUMB_BUILD), \
$(if $(CONFIG_HAS_THUMB2),, \
-I$(srctree)/arch/$(ARCH)/thumb1/include),) \
-I$(srctree)/arch/$(ARCH)/include \
-include $(srctree)/include/linux/kconfig.h

NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
CHECKFLAGS += $(NOSTDINC_FLAGS)

# FIX ME
cpp_flags := $(KBUILD_CPPFLAGS) $(PLATFORM_CPPFLAGS) $(UBOOTINCLUDE) \
$(NOSTDINC_FLAGS)
c_flags := $(KBUILD_CFLAGS) $(cpp_flags)

#########################################################################
# U-Boot objects....order is important (i.e. start must be first)

HAVE_VENDOR_COMMON_LIB = $(if $(wildcard $(srctree)/board/$(VENDOR)/common/Makefile),y,n)

libs-y += lib/
libs-$(HAVE_VENDOR_COMMON_LIB) += board/$(VENDOR)/common/
libs-$(CONFIG_OF_EMBED) += dts/
libs-y += fs/
libs-y += net/
libs-y += disk/
libs-y += drivers/
libs-y += drivers/dma/
libs-y += drivers/gpio/
libs-y += drivers/i2c/
libs-y += drivers/net/
libs-y += drivers/net/phy/
libs-y += drivers/power/ \
drivers/power/domain/ \
drivers/power/fuel_gauge/ \
drivers/power/mfd/ \
drivers/power/pmic/ \
drivers/power/battery/ \
drivers/power/regulator/
libs-y += drivers/spi/
libs-$(CONFIG_FMAN_ENET) += drivers/net/fm/
libs-$(CONFIG_SYS_FSL_DDR) += drivers/ddr/fsl/
libs-$(CONFIG_SYS_FSL_MMDC) += drivers/ddr/fsl/
libs-$(CONFIG_$(SPL_)ALTERA_SDRAM) += drivers/ddr/altera/
libs-y += drivers/serial/
libs-y += drivers/usb/cdns3/
libs-y += drivers/usb/dwc3/
libs-y += drivers/usb/common/
libs-y += drivers/usb/emul/
libs-y += drivers/usb/eth/
libs-$(CONFIG_USB_GADGET) += drivers/usb/gadget/
libs-$(CONFIG_USB_GADGET) += drivers/usb/gadget/udc/
libs-y += drivers/usb/host/
libs-y += drivers/usb/musb/
libs-y += drivers/usb/musb-new/
libs-y += drivers/usb/phy/
libs-y += drivers/usb/ulpi/
libs-y += cmd/
libs-y += common/
libs-y += env/
libs-$(CONFIG_API) += api/
libs-$(CONFIG_HAS_POST) += post/
libs-$(CONFIG_UNIT_TEST) += test/ test/dm/
libs-$(CONFIG_UT_ENV) += test/env/
libs-$(CONFIG_UT_OPTEE) += test/optee/
libs-$(CONFIG_UT_OVERLAY) += test/overlay/

libs-y += $(if $(BOARDDIR),board/$(BOARDDIR)/)

libs-y := $(sort $(libs-y))

u-boot-dirs := $(patsubst %/,%,$(filter %/, $(libs-y))) tools examples

u-boot-alldirs := $(sort $(u-boot-dirs) $(patsubst %/,%,$(filter %/, $(libs-))))

libs-y := $(patsubst %/, %/built-in.o, $(libs-y))

u-boot-init := $(head-y)
u-boot-main := $(libs-y)


# Add GCC lib
ifeq ($(CONFIG_USE_PRIVATE_LIBGCC),y)
PLATFORM_LIBGCC = arch/$(ARCH)/lib/lib.a
else
PLATFORM_LIBGCC := -L $(shell dirname `$(CC) $(c_flags) -print-libgcc-file-name`) -lgcc
endif
PLATFORM_LIBS += $(PLATFORM_LIBGCC)

ifdef CONFIG_CC_COVERAGE
KBUILD_CFLAGS += --coverage
PLATFORM_LIBGCC += -lgcov
endif

export PLATFORM_LIBS
export PLATFORM_LIBGCC

# Special flags for CPP when processing the linker script.
# Pass the version down so we can handle backwards compatibility
# on the fly.
LDPPFLAGS += \
-include $(srctree)/include/u-boot/u-boot.lds.h \
-DCPUDIR=$(CPUDIR) \
$(shell $(LD) --version | \
sed -ne 's/GNU ld version \([0-9][0-9]*\)\.\([0-9][0-9]*\).*/-DLD_MAJOR=\1 -DLD_MINOR=\2/p')

#########################################################################
#########################################################################

ifneq ($(CONFIG_BOARD_SIZE_LIMIT),)
BOARD_SIZE_CHECK= @ $(call size_check,$@,$(CONFIG_BOARD_SIZE_LIMIT))
else
BOARD_SIZE_CHECK =
endif

ifneq ($(CONFIG_SPL_SIZE_LIMIT),0)
SPL_SIZE_CHECK = @$(call size_check,$@,$$(tools/spl_size_limit))
else
SPL_SIZE_CHECK =
endif

ifneq ($(CONFIG_TPL_SIZE_LIMIT),0)
TPL_SIZE_CHECK = @$(call size_check,$@,$(CONFIG_TPL_SIZE_LIMIT))
else
TPL_SIZE_CHECK =
endif

# Statically apply RELA-style relocations (currently arm64 only)
# This is useful for arm64 where static relocation needs to be performed on
# the raw binary, but certain simulators only accept an ELF file (but don't
# do the relocation).
ifneq ($(CONFIG_STATIC_RELA),)
# $(1) is u-boot ELF, $(2) is u-boot bin, $(3) is text base
DO_STATIC_RELA = \
start=$$($(NM) $(1) | grep __rel_dyn_start | cut -f 1 -d ' '); \
end=$$($(NM) $(1) | grep __rel_dyn_end | cut -f 1 -d ' '); \
tools/relocate-rela $(2) $(3) $$start $$end
else
DO_STATIC_RELA =
endif

# Always append ALL so that arch config.mk's can add custom ones
ALL-y += u-boot.srec u-boot.bin u-boot.sym System.map binary_size_check

ALL-$(CONFIG_ONENAND_U_BOOT) += u-boot-onenand.bin
ifeq ($(CONFIG_SPL_FSL_PBL),y)
ALL-$(CONFIG_RAMBOOT_PBL) += u-boot-with-spl-pbl.bin
else
ifneq ($(CONFIG_SECURE_BOOT), y)
# For Secure Boot The Image needs to be signed and Header must also
# be included. So The image has to be built explicitly
ALL-$(CONFIG_RAMBOOT_PBL) += u-boot.pbl
endif
endif
ALL-$(CONFIG_SPL) += spl/u-boot-spl.bin
ifeq ($(CONFIG_MX6)$(CONFIG_IMX_HAB), yy)
ALL-$(CONFIG_SPL_FRAMEWORK) += u-boot-ivt.img
else
ifeq ($(CONFIG_MX7)$(CONFIG_IMX_HAB), yy)
ALL-$(CONFIG_SPL_FRAMEWORK) += u-boot-ivt.img
else
ALL-$(CONFIG_SPL_FRAMEWORK) += u-boot.img
endif
endif
ALL-$(CONFIG_TPL) += tpl/u-boot-tpl.bin
ALL-$(CONFIG_OF_SEPARATE) += u-boot.dtb
ifeq ($(CONFIG_SPL_FRAMEWORK),y)
ALL-$(CONFIG_OF_SEPARATE) += u-boot-dtb.img
endif
ALL-$(CONFIG_OF_HOSTFILE) += u-boot.dtb
ifneq ($(CONFIG_SPL_TARGET),)
ALL-$(CONFIG_SPL) += $(CONFIG_SPL_TARGET:"%"=%)
endif
ALL-$(CONFIG_REMAKE_ELF) += u-boot.elf
ALL-$(CONFIG_EFI_APP) += u-boot-app.efi
ALL-$(CONFIG_EFI_STUB) += u-boot-payload.efi

ifneq ($(BUILD_ROM)$(CONFIG_BUILD_ROM),)
ALL-$(CONFIG_X86_RESET_VECTOR) += u-boot.rom
endif

# Build a combined spl + u-boot image for sunxi
ifeq ($(CONFIG_ARCH_SUNXI)$(CONFIG_SPL),yy)
ALL-y += u-boot-sunxi-with-spl.bin
endif

# enable combined SPL/u-boot/dtb rules for tegra
ifeq ($(CONFIG_TEGRA)$(CONFIG_SPL),yy)
ALL-y += u-boot-tegra.bin u-boot-nodtb-tegra.bin
ALL-$(CONFIG_OF_SEPARATE) += u-boot-dtb-tegra.bin
endif

ALL-$(CONFIG_ARCH_MEDIATEK) += u-boot-mtk.bin

# Add optional build target if defined in board/cpu/soc headers
ifneq ($(CONFIG_BUILD_TARGET),)
ALL-y += $(CONFIG_BUILD_TARGET:"%"=%)
endif

ifdef CONFIG_INIT_SP_RELATIVE
ALL-y += init_sp_bss_offset_check
endif

ifeq ($(CONFIG_MPC85xx)$(CONFIG_OF_SEPARATE),yy)
ALL-y += u-boot-with-dtb.bin
endif

ifeq ($(CONFIG_ARCH_ROCKCHIP)$(CONFIG_SPL)$(CONFIG_TPL),yyy)
ALL-y += idbloader.img
endif

LDFLAGS_u-boot += $(LDFLAGS_FINAL)

# Avoid 'Not enough room for program headers' error on binutils 2.28 onwards.
LDFLAGS_u-boot += $(call ld-option, --no-dynamic-linker)

ifeq ($(CONFIG_ARC)$(CONFIG_NIOS2)$(CONFIG_X86)$(CONFIG_XTENSA),)
LDFLAGS_u-boot += -Ttext $(CONFIG_SYS_TEXT_BASE)
endif

# Normally we fill empty space with 0xff
quiet_cmd_objcopy = OBJCOPY $@
cmd_objcopy = $(OBJCOPY) --gap-fill=0xff $(OBJCOPYFLAGS) \
$(OBJCOPYFLAGS_$(@F)) $< $@

# Provide a version which does not do this, for use by EFI
quiet_cmd_zobjcopy = OBJCOPY $@
cmd_zobjcopy = $(OBJCOPY) $(OBJCOPYFLAGS) $(OBJCOPYFLAGS_$(@F)) $< $@

quiet_cmd_efipayload = OBJCOPY $@
cmd_efipayload = $(OBJCOPY) -I binary -O $(EFIPAYLOAD_BFDTARGET) -B $(EFIPAYLOAD_BFDARCH) $< $@

MKIMAGEOUTPUT ?= /dev/null

quiet_cmd_mkimage = MKIMAGE $@
cmd_mkimage = $(objtree)/tools/mkimage $(MKIMAGEFLAGS_$(@F)) -d $< $@ \
>$(MKIMAGEOUTPUT) $(if $(KBUILD_VERBOSE:0=), && cat $(MKIMAGEOUTPUT))

quiet_cmd_mkfitimage = MKIMAGE $@
cmd_mkfitimage = $(objtree)/tools/mkimage $(MKIMAGEFLAGS_$(@F)) -f $(U_BOOT_ITS) -p $(CONFIG_FIT_EXTERNAL_OFFSET) $@\
>$(MKIMAGEOUTPUT) $(if $(KBUILD_VERBOSE:0=), && cat $(MKIMAGEOUTPUT))

quiet_cmd_cat = CAT $@
cmd_cat = cat $(filter-out $(PHONY), $^) > $@

append = cat $(filter-out $< $(PHONY), $^) >> $@

quiet_cmd_pad_cat = CAT $@
cmd_pad_cat = $(cmd_objcopy) && $(append) || rm -f $@

cfg: u-boot.cfg

quiet_cmd_cfgcheck = CFGCHK $2
cmd_cfgcheck = $(srctree)/scripts/check-config.sh $2 \
$(srctree)/scripts/config_whitelist.txt $(srctree)

all: $(ALL-y)
ifeq ($(CONFIG_DEPRECATED),y)
$(warning "You have deprecated configuration options enabled in your .config! Please check your configuration.")
ifeq ($(CONFIG_SPI),y)
ifneq ($(CONFIG_DM_SPI)$(CONFIG_OF_CONTROL),yy)
$(warning "The relevant config item with associated code will remove in v2019.07 release.")
endif
endif
endif
ifneq ($(CONFIG_DM),y)
@echo >&2 "===================== WARNING ======================"
@echo >&2 "This board does not use CONFIG_DM. CONFIG_DM will be"
@echo >&2 "compulsory starting with the v2020.01 release."
@echo >&2 "Failure to update may result in board removal."
@echo >&2 "See doc/driver-model/migration.rst for more info."
@echo >&2 "===================================================="
endif
ifeq ($(CONFIG_MMC),y)
ifneq ($(CONFIG_DM_MMC)$(CONFIG_OF_CONTROL)$(CONFIG_BLK),yyy)
@echo >&2 "===================== WARNING ======================"
@echo >&2 "This board does not use CONFIG_DM_MMC. Please update"
@echo >&2 "the board to use CONFIG_DM_MMC before the v2019.04 release."
@echo >&2 "Failure to update by the deadline may result in board removal."
@echo >&2 "See doc/driver-model/MIGRATION.txt for more info."
@echo >&2 "===================================================="
endif
endif
ifeq ($(CONFIG_USB),y)
ifneq ($(CONFIG_DM_USB)$(CONFIG_OF_CONTROL)$(CONFIG_BLK),yyy)
@echo >&2 "===================== WARNING ======================"
@echo >&2 "This board does not use CONFIG_DM_USB. Please update"
@echo >&2 "the board to use CONFIG_DM_USB before the v2019.07 release."
@echo >&2 "Failure to update by the deadline may result in board removal."
@echo >&2 "See doc/driver-model/MIGRATION.txt for more info."
@echo >&2 "===================================================="
endif
endif
ifeq ($(CONFIG_MVSATA_IDE),y)
@echo >&2 "===================== WARNING ======================"
@echo >&2 "This board does use CONFIG_MVSATA_IDE which is not"
@echo >&2 "ported to driver-model (DM) yet. Please update the storage"
@echo >&2 "controller driver to use CONFIG_AHCI before the v2019.07"
@echo >&2 "release."
@echo >&2 "Failure to update by the deadline may result in board removal."
@echo >&2 "See doc/driver-model/MIGRATION.txt for more info."
@echo >&2 "===================================================="
endif
ifeq ($(CONFIG_LIBATA),y)
ifneq ($(CONFIG_AHCI),y)
@echo >&2 "===================== WARNING ======================"
@echo >&2 "This board does use CONFIG_LIBATA but has CONFIG_AHCI not"
@echo >&2 "enabled. Please update the storage controller driver to use"
@echo >&2 "CONFIG_AHCI before the v2019.07 release."
@echo >&2 "Failure to update by the deadline may result in board removal."
@echo >&2 "See doc/driver-model/MIGRATION.txt for more info."
@echo >&2 "===================================================="
endif
endif
ifeq ($(CONFIG_PCI),y)
ifneq ($(CONFIG_DM_PCI),y)
@echo >&2 "===================== WARNING ======================"
@echo >&2 "This board does not use CONFIG_DM_PCI Please update"
@echo >&2 "the board to use CONFIG_DM_PCI before the v2019.07 release."
@echo >&2 "Failure to update by the deadline may result in board removal."
@echo >&2 "See doc/driver-model/MIGRATION.txt for more info."
@echo >&2 "===================================================="
endif
endif
ifneq ($(CONFIG_LCD)$(CONFIG_VIDEO),)
ifneq ($(CONFIG_DM_VIDEO),y)
@echo >&2 "===================== WARNING ======================"
@echo >&2 "This board does not use CONFIG_DM_VIDEO Please update"
@echo >&2 "the board to use CONFIG_DM_VIDEO before the v2019.07 release."
@echo >&2 "Failure to update by the deadline may result in board removal."
@echo >&2 "See doc/driver-model/MIGRATION.txt for more info."
@echo >&2 "===================================================="
endif
endif
ifeq ($(CONFIG_OF_EMBED),y)
@echo >&2 "===================== WARNING ======================"
@echo >&2 "CONFIG_OF_EMBED is enabled. This option should only"
@echo >&2 "be used for debugging purposes. Please use"
@echo >&2 "CONFIG_OF_SEPARATE for boards in mainline."
@echo >&2 "See doc/README.fdt-control for more info."
@echo >&2 "===================================================="
endif
ifeq ($(CONFIG_SPI_FLASH),y)
ifneq ($(CONFIG_DM_SPI_FLASH)$(CONFIG_OF_CONTROL),yy)
@echo >&2 "===================== WARNING ======================"
@echo >&2 "This board does not use CONFIG_DM_SPI_FLASH. Please update"
@echo >&2 "the board to use CONFIG_SPI_FLASH before the v2019.07 release."
@echo >&2 "Failure to update by the deadline may result in board removal."
@echo >&2 "See doc/driver-model/MIGRATION.txt for more info."
@echo >&2 "===================================================="
endif
endif
ifneq ($(CONFIG_WATCHDOG)$(CONFIG_HW_WATCHDOG),)
ifneq ($(CONFIG_WDT),y)
@echo >&2 "===================== WARNING ======================"
@echo >&2 "This board does not use CONFIG_WDT (DM watchdog support)."
@echo >&2 "Please update the board to use CONFIG_WDT before the"
@echo >&2 "v2019.10 release."
@echo >&2 "Failure to update by the deadline may result in board removal."
@echo >&2 "See doc/driver-model/MIGRATION.txt for more info."
@echo >&2 "===================================================="
endif
endif
ifneq ($(CONFIG_NET),)
ifneq ($(CONFIG_DM_ETH),y)
@echo >&2 "===================== WARNING ======================"
@echo >&2 "This board does not use CONFIG_DM_ETH (Driver Model"
@echo >&2 "for Ethernet drivers). Please update the board to use"
@echo >&2 "CONFIG_DM_ETH before the v2020.07 release. Failure to"
@echo >&2 "update by the deadline may result in board removal."
@echo >&2 "See doc/driver-model/migration.rst for more info."
@echo >&2 "===================================================="
endif
endif
@# Check that this build does not use CONFIG options that we do not
@# know about unless they are in Kconfig. All the existing CONFIG
@# options are whitelisted, so new ones should not be added.
$(call cmd,cfgcheck,u-boot.cfg)

PHONY += dtbs
dtbs: dts/dt.dtb
@:
dts/dt.dtb: u-boot
$(Q)$(MAKE) $(build)=dts dtbs

quiet_cmd_copy = COPY $@
cmd_copy = cp $< $@

ifeq ($(CONFIG_MULTI_DTB_FIT),y)

ifeq ($(CONFIG_MULTI_DTB_FIT_LZO),y)
FINAL_DTB_CONTAINER = fit-dtb.blob.lzo
else ifeq ($(CONFIG_MULTI_DTB_FIT_GZIP),y)
FINAL_DTB_CONTAINER = fit-dtb.blob.gz
else
FINAL_DTB_CONTAINER = fit-dtb.blob
endif

fit-dtb.blob.gz: fit-dtb.blob
@gzip -kf9 $< > $@

fit-dtb.blob.lzo: fit-dtb.blob
@lzop -f9 $< > $@

fit-dtb.blob: dts/dt.dtb FORCE
$(call if_changed,mkimage)
ifneq ($(SOURCE_DATE_EPOCH),)
touch -d @$(SOURCE_DATE_EPOCH) fit-dtb.blob
chmod 0600 fit-dtb.blob
endif

MKIMAGEFLAGS_fit-dtb.blob = -f auto -A $(ARCH) -T firmware -C none -O u-boot \
-a 0 -e 0 -E \
$(patsubst %,-b arch/$(ARCH)/dts/%.dtb,$(subst ",,$(CONFIG_OF_LIST))) -d /dev/null

ifneq ($(EXT_DTB),)
u-boot-fit-dtb.bin: u-boot-nodtb.bin $(EXT_DTB)
$(call if_changed,cat)
else
u-boot-fit-dtb.bin: u-boot-nodtb.bin $(FINAL_DTB_CONTAINER)
$(call if_changed,cat)
endif

u-boot.bin: u-boot-fit-dtb.bin FORCE
$(call if_changed,copy)

u-boot-dtb.bin: u-boot-nodtb.bin dts/dt.dtb FORCE
$(call if_changed,cat)

else ifeq ($(CONFIG_OF_SEPARATE),y)
u-boot-dtb.bin: u-boot-nodtb.bin dts/dt.dtb FORCE
$(call if_changed,cat)

u-boot.bin: u-boot-dtb.bin FORCE
$(call if_changed,copy)
else
u-boot.bin: u-boot-nodtb.bin FORCE
$(call if_changed,copy)
endif

# we call Makefile in arch/arm/mach-imx which
# has targets which are dependent on targets defined
# here. make could not resolve them and we must ensure
# that they are finished before calling imx targets
ifeq ($(CONFIG_MULTI_DTB_FIT),y)
IMX_DEPS = u-boot-fit-dtb.bin
endif

%.imx: $(IMX_DEPS) %.bin
$(Q)$(MAKE) $(build)=arch/arm/mach-imx $@
$(BOARD_SIZE_CHECK)

%.vyb: %.imx
$(Q)$(MAKE) $(build)=arch/arm/cpu/armv7/vf610 $@

quiet_cmd_copy = COPY $@
cmd_copy = cp $< $@

u-boot.dtb: dts/dt.dtb
$(call cmd,copy)

OBJCOPYFLAGS_u-boot.hex := -O ihex

OBJCOPYFLAGS_u-boot.srec := -O srec

u-boot.hex u-boot.srec: u-boot FORCE
$(call if_changed,objcopy)

OBJCOPYFLAGS_u-boot-elf.srec := $(OBJCOPYFLAGS_u-boot.srec)

u-boot-elf.srec: u-boot.elf FORCE
$(call if_changed,objcopy)

OBJCOPYFLAGS_u-boot-spl.srec = $(OBJCOPYFLAGS_u-boot.srec)

spl/u-boot-spl.srec: spl/u-boot-spl FORCE
$(call if_changed,objcopy)

%.scif: %.srec
$(Q)$(MAKE) $(build)=arch/arm/mach-rmobile $@

OBJCOPYFLAGS_u-boot-nodtb.bin := -O binary \
$(if $(CONFIG_X86_16BIT_INIT),-R .start16 -R .resetvec) \
$(if $(CONFIG_MPC85XX_HAVE_RESET_VECTOR),-R .bootpg -R .resetvec)

OBJCOPYFLAGS_u-boot-spl.hex = $(OBJCOPYFLAGS_u-boot.hex)

spl/u-boot-spl.hex: spl/u-boot-spl FORCE
$(call if_changed,objcopy)

binary_size_check: u-boot-nodtb.bin FORCE
@file_size=$(shell wc -c u-boot-nodtb.bin | awk '{print $$1}') ; \
map_size=$(shell cat u-boot.map | \
awk '/_image_copy_start/ {start = $$1} /_image_binary_end/ {end = $$1} END {if (start != "" && end != "") print "ibase=16; " toupper(end) " - " toupper(start)}' \
| sed 's/0X//g' \
| bc); \
if [ "" != "$$map_size" ]; then \
if test $$map_size -ne $$file_size; then \
echo "u-boot.map shows a binary size of $$map_size" >&2 ; \
echo " but u-boot-nodtb.bin shows $$file_size" >&2 ; \
exit 1; \
fi \
fi

ifdef CONFIG_INIT_SP_RELATIVE
ifneq ($(CONFIG_SYS_MALLOC_F_LEN),)
subtract_sys_malloc_f_len = space=$$(($${space} - $(CONFIG_SYS_MALLOC_F_LEN)))
else
subtract_sys_malloc_f_len = true
endif
# The 1/4 margin below is somewhat arbitrary. The likely initial SP usage is
# so low that the DTB could probably use 90%+ of the available space, for
# current values of CONFIG_SYS_INIT_SP_BSS_OFFSET at least. However, let's be
# safe for now and tweak this later if space becomes tight.
# A rejected alternative would be to check that some absolute minimum stack
# space was available. However, since CONFIG_SYS_INIT_SP_BSS_OFFSET is
# deliberately build-specific, to take account of build-to-build stack usage
# differences due to different feature sets, there is no common absolute value
# to check against.
init_sp_bss_offset_check: u-boot.dtb FORCE
@dtb_size=$(shell wc -c u-boot.dtb | awk '{print $$1}') ; \
space=$(CONFIG_SYS_INIT_SP_BSS_OFFSET) ; \
$(subtract_sys_malloc_f_len) ; \
quarter_space=$$(($${space} / 4)) ; \
if [ $${dtb_size} -gt $${quarter_space} ]; then \
echo "u-boot.dtb is larger than 1 quarter of " >&2 ; \
echo "(CONFIG_SYS_INIT_SP_BSS_OFFSET - CONFIG_SYS_MALLOC_F_LEN)" >&2 ; \
exit 1 ; \
fi
endif

u-boot-nodtb.bin: u-boot FORCE
$(call if_changed,objcopy)
$(call DO_STATIC_RELA,$<,$@,$(CONFIG_SYS_TEXT_BASE))
$(BOARD_SIZE_CHECK)

u-boot.ldr: u-boot
$(CREATE_LDR_ENV)
$(LDR) -T $(CONFIG_CPU) -c $@ $< $(LDR_FLAGS)
$(BOARD_SIZE_CHECK)

# binman
# ---------------------------------------------------------------------------
# Use 'make BINMAN_DEBUG=1' to enable debugging
quiet_cmd_binman = BINMAN $@
cmd_binman = $(srctree)/tools/binman/binman $(if $(BINMAN_DEBUG),-D) \
--toolpath $(objtree)/tools \
$(if $(BINMAN_VERBOSE),-v$(BINMAN_VERBOSE)) \
build -u -d u-boot.dtb -O . -m \
-I . -I $(srctree) -I $(srctree)/board/$(BOARDDIR) \
$(BINMAN_$(@F))

OBJCOPYFLAGS_u-boot.ldr.hex := -I binary -O ihex

OBJCOPYFLAGS_u-boot.ldr.srec := -I binary -O srec

u-boot.ldr.hex u-boot.ldr.srec: u-boot.ldr FORCE
$(call if_changed,objcopy)

#
# U-Boot entry point, needed for booting of full-blown U-Boot
# from the SPL U-Boot version.
#
ifndef CONFIG_SYS_UBOOT_START
CONFIG_SYS_UBOOT_START := 0
endif

# Boards with more complex image requirements can provide an .its source file
# or a generator script
ifneq ($(CONFIG_SPL_FIT_SOURCE),"")
U_BOOT_ITS = $(subst ",,$(CONFIG_SPL_FIT_SOURCE))
else
ifneq ($(CONFIG_SPL_FIT_GENERATOR),"")
U_BOOT_ITS := u-boot.its
ifeq ($(CONFIG_SPL_FIT_GENERATOR),"arch/arm/mach-imx/mkimage_fit_atf.sh")
U_BOOT_ITS_DEPS += u-boot-nodtb.bin
endif
ifeq ($(CONFIG_SPL_FIT_GENERATOR),"arch/arm/mach-rockchip/make_fit_atf.py")
U_BOOT_ITS_DEPS += u-boot
endif
$(U_BOOT_ITS): $(U_BOOT_ITS_DEPS) FORCE
$(srctree)/$(CONFIG_SPL_FIT_GENERATOR) \
$(patsubst %,arch/$(ARCH)/dts/%.dtb,$(subst ",,$(CONFIG_OF_LIST))) > $@
endif
endif

ifdef CONFIG_SPL_LOAD_FIT
MKIMAGEFLAGS_u-boot.img = -f auto -A $(ARCH) -T firmware -C none -O u-boot \
-a $(CONFIG_SYS_TEXT_BASE) -e $(CONFIG_SYS_UBOOT_START) \
-p $(CONFIG_FIT_EXTERNAL_OFFSET) \
-n "U-Boot $(UBOOTRELEASE) for $(BOARD) board" -E \
$(patsubst %,-b arch/$(ARCH)/dts/%.dtb,$(subst ",,$(CONFIG_OF_LIST)))
else
MKIMAGEFLAGS_u-boot.img = -A $(ARCH) -T firmware -C none -O u-boot \
-a $(CONFIG_SYS_TEXT_BASE) -e $(CONFIG_SYS_UBOOT_START) \
-n "U-Boot $(UBOOTRELEASE) for $(BOARD) board"
MKIMAGEFLAGS_u-boot-ivt.img = -A $(ARCH) -T firmware_ivt -C none -O u-boot \
-a $(CONFIG_SYS_TEXT_BASE) -e $(CONFIG_SYS_UBOOT_START) \
-n "U-Boot $(UBOOTRELEASE) for $(BOARD) board"
u-boot-ivt.img: MKIMAGEOUTPUT = u-boot-ivt.img.log
endif

MKIMAGEFLAGS_u-boot-dtb.img = $(MKIMAGEFLAGS_u-boot.img)

# Some boards have the kwbimage.cfg file written in advance, while some
# other boards generate it on the fly during the build in the build tree.
# Let's check if the file exists in the build tree first, otherwise we
# fall back to use the one in the source tree.
KWD_CONFIG_FILE = $(shell \
if [ -f $(objtree)/$(CONFIG_SYS_KWD_CONFIG:"%"=%) ]; then \
echo -n $(objtree)/$(CONFIG_SYS_KWD_CONFIG:"%"=%); \
else \
echo -n $(srctree)/$(CONFIG_SYS_KWD_CONFIG:"%"=%); \
fi)

MKIMAGEFLAGS_u-boot.kwb = -n $(KWD_CONFIG_FILE) \
-T kwbimage -a $(CONFIG_SYS_TEXT_BASE) -e $(CONFIG_SYS_TEXT_BASE)

MKIMAGEFLAGS_u-boot-spl.kwb = -n $(KWD_CONFIG_FILE) \
-T kwbimage -a $(CONFIG_SYS_TEXT_BASE) -e $(CONFIG_SYS_TEXT_BASE) \
$(if $(KEYDIR),-k $(KEYDIR))

MKIMAGEFLAGS_u-boot.pbl = -n $(srctree)/$(CONFIG_SYS_FSL_PBL_RCW:"%"=%) \
-R $(srctree)/$(CONFIG_SYS_FSL_PBL_PBI:"%"=%) -T pblimage

ifeq ($(CONFIG_MPC85xx)$(CONFIG_OF_SEPARATE),yy)
UBOOT_BIN := u-boot-with-dtb.bin
else
UBOOT_BIN := u-boot.bin
endif

u-boot-dtb.img u-boot.img u-boot.kwb u-boot.pbl u-boot-ivt.img: \
$(if $(CONFIG_SPL_LOAD_FIT),u-boot-nodtb.bin \
$(if $(CONFIG_OF_SEPARATE)$(CONFIG_OF_EMBED)$(CONFIG_OF_HOSTFILE),dts/dt.dtb) \
,$(UBOOT_BIN)) FORCE
$(call if_changed,mkimage)
$(BOARD_SIZE_CHECK)

ifeq ($(CONFIG_SPL_LOAD_FIT_FULL),y)
MKIMAGEFLAGS_u-boot.itb =
else
MKIMAGEFLAGS_u-boot.itb = -E
endif

u-boot.itb: u-boot-nodtb.bin \
$(if $(CONFIG_OF_SEPARATE)$(CONFIG_OF_EMBED)$(CONFIG_OF_HOSTFILE),dts/dt.dtb) \
$(U_BOOT_ITS) FORCE
$(call if_changed,mkfitimage)
$(BOARD_SIZE_CHECK)

u-boot-spl.kwb: u-boot.img spl/u-boot-spl.bin FORCE
$(call if_changed,mkimage)

u-boot.sha1: u-boot.bin
tools/ubsha1 u-boot.bin

u-boot.dis: u-boot
$(OBJDUMP) -d $< > $@

ifneq ($(CONFIG_SPL_PAYLOAD),)
SPL_PAYLOAD := $(CONFIG_SPL_PAYLOAD:"%"=%)
else
SPL_PAYLOAD := u-boot.bin
endif

SPL_IMAGE := $(CONFIG_SPL_IMAGE:"%"=%)

OBJCOPYFLAGS_u-boot-with-spl.bin = -I binary -O binary \
--pad-to=$(CONFIG_SPL_PAD_TO)
u-boot-with-spl.bin: $(SPL_IMAGE) $(SPL_PAYLOAD) FORCE
$(call if_changed,pad_cat)

ifeq ($(CONFIG_ARCH_ROCKCHIP),y)
MKIMAGEFLAGS_u-boot-tpl.img = -n $(CONFIG_SYS_SOC) -T rksd
tpl/u-boot-tpl.img: tpl/u-boot-tpl.bin FORCE
$(call if_changed,mkimage)
idbloader.img: tpl/u-boot-tpl.img spl/u-boot-spl.bin FORCE
$(call if_changed,cat)
endif

ifeq ($(CONFIG_ARCH_LPC32XX)$(CONFIG_SPL),yy)
MKIMAGEFLAGS_lpc32xx-spl.img = -T lpc32xximage -a $(CONFIG_SPL_TEXT_BASE)

lpc32xx-spl.img: spl/u-boot-spl.bin FORCE
$(call if_changed,mkimage)

OBJCOPYFLAGS_lpc32xx-boot-0.bin = -I binary -O binary --pad-to=$(CONFIG_SPL_PAD_TO)

lpc32xx-boot-0.bin: lpc32xx-spl.img FORCE
$(call if_changed,objcopy)

OBJCOPYFLAGS_lpc32xx-boot-1.bin = -I binary -O binary --pad-to=$(CONFIG_SPL_PAD_TO)

lpc32xx-boot-1.bin: lpc32xx-spl.img FORCE
$(call if_changed,objcopy)

lpc32xx-full.bin: lpc32xx-boot-0.bin lpc32xx-boot-1.bin u-boot.img FORCE
$(call if_changed,cat)

endif

OBJCOPYFLAGS_u-boot-with-tpl.bin = -I binary -O binary \
--pad-to=$(CONFIG_TPL_PAD_TO)
tpl/u-boot-with-tpl.bin: tpl/u-boot-tpl.bin u-boot.bin FORCE
$(call if_changed,pad_cat)

SPL: spl/u-boot-spl.bin FORCE
$(Q)$(MAKE) $(build)=arch/arm/mach-imx $@

ifeq ($(CONFIG_ARCH_IMX8M)$(CONFIG_ARCH_IMX8), y)
ifeq ($(CONFIG_SPL_LOAD_IMX_CONTAINER), y)
u-boot.cnt: u-boot.bin FORCE
$(Q)$(MAKE) $(build)=arch/arm/mach-imx $@

flash.bin: spl/u-boot-spl.bin u-boot.cnt FORCE
$(Q)$(MAKE) $(build)=arch/arm/mach-imx $@
else
flash.bin: spl/u-boot-spl.bin u-boot.itb FORCE
$(Q)$(MAKE) $(build)=arch/arm/mach-imx $@
endif
endif

u-boot-with-spl.imx u-boot-with-nand-spl.imx: SPL u-boot.bin FORCE
$(Q)$(MAKE) $(build)=arch/arm/mach-imx $@

MKIMAGEFLAGS_u-boot.ubl = -n $(UBL_CONFIG) -T ublimage -e $(CONFIG_SYS_TEXT_BASE)

u-boot.ubl: u-boot-with-spl.bin FORCE
$(call if_changed,mkimage)

MKIMAGEFLAGS_u-boot-spl.ais = -s -n $(if $(CONFIG_AIS_CONFIG_FILE), \
$(srctree)/$(CONFIG_AIS_CONFIG_FILE:"%"=%),"/dev/null") \
-T aisimage -e $(CONFIG_SPL_TEXT_BASE)
spl/u-boot-spl.ais: spl/u-boot-spl.bin FORCE
$(call if_changed,mkimage)

OBJCOPYFLAGS_u-boot.ais = -I binary -O binary --pad-to=$(CONFIG_SPL_PAD_TO)
u-boot.ais: spl/u-boot-spl.ais u-boot.img FORCE
$(call if_changed,pad_cat)

u-boot-signed.sb: u-boot.bin spl/u-boot-spl.bin
$(Q)$(MAKE) $(build)=arch/arm/cpu/arm926ejs/mxs u-boot-signed.sb
u-boot.sb: u-boot.bin spl/u-boot-spl.bin
$(Q)$(MAKE) $(build)=arch/arm/cpu/arm926ejs/mxs u-boot.sb

# On x600 (SPEAr600) U-Boot is appended to U-Boot SPL.
# Both images are created using mkimage (crc etc), so that the ROM
# bootloader can check its integrity. Padding needs to be done to the
# SPL image (with mkimage header) and not the binary. Otherwise the resulting image
# which is loaded/copied by the ROM bootloader to SRAM doesn't fit.
# The resulting image containing both U-Boot images is called u-boot.spr
MKIMAGEFLAGS_u-boot-spl.img = -A $(ARCH) -T firmware -C none \
-a $(CONFIG_SPL_TEXT_BASE) -e $(CONFIG_SPL_TEXT_BASE) -n XLOADER
spl/u-boot-spl.img: spl/u-boot-spl.bin FORCE
$(call if_changed,mkimage)

OBJCOPYFLAGS_u-boot.spr = -I binary -O binary --pad-to=$(CONFIG_SPL_PAD_TO) \
--gap-fill=0xff
u-boot.spr: spl/u-boot-spl.img u-boot.img FORCE
$(call if_changed,pad_cat)

ifneq ($(CONFIG_ARCH_SOCFPGA),)
quiet_cmd_socboot = SOCBOOT $@
cmd_socboot = cat spl/u-boot-spl.sfp spl/u-boot-spl.sfp \
spl/u-boot-spl.sfp spl/u-boot-spl.sfp \
u-boot.img > $@ || rm -f $@
u-boot-with-spl.sfp: spl/u-boot-spl.sfp u-boot.img FORCE
$(call if_changed,socboot)

quiet_cmd_socnandboot = SOCNANDBOOT $@
cmd_socnandboot = dd if=/dev/zero of=spl/u-boot-spl.pad bs=64 count=1024 ; \
cat spl/u-boot-spl.sfp spl/u-boot-spl.pad \
spl/u-boot-spl.sfp spl/u-boot-spl.pad \
spl/u-boot-spl.sfp spl/u-boot-spl.pad \
spl/u-boot-spl.sfp spl/u-boot-spl.pad \
u-boot.img > $@ || rm -f $@ spl/u-boot-spl.pad
u-boot-with-nand-spl.sfp: spl/u-boot-spl.sfp u-boot.img FORCE
$(call if_changed,socnandboot)

endif

ifeq ($(CONFIG_MPC85xx)$(CONFIG_OF_SEPARATE),yy)
u-boot-with-dtb.bin: u-boot.bin u-boot.dtb \
$(if $(CONFIG_MPC85XX_HAVE_RESET_VECTOR), u-boot-br.bin) FORCE
$(call if_changed,binman)

ifeq ($(CONFIG_MPC85XX_HAVE_RESET_VECTOR),y)
OBJCOPYFLAGS_u-boot-br.bin := -O binary -j .bootpg -j .resetvec
u-boot-br.bin: u-boot FORCE
$(call if_changed,objcopy)
endif
endif

# x86 uses a large ROM. We fill it with 0xff, put the 16-bit stuff (including
# reset vector) at the top, Intel ME descriptor at the bottom, and U-Boot in
# the middle. This is handled by binman based on an image description in the
# board's device tree.
ifneq ($(CONFIG_X86_RESET_VECTOR),)
rom: u-boot.rom FORCE

refcode.bin: $(srctree)/board/$(BOARDDIR)/refcode.bin FORCE
$(call if_changed,copy)

quiet_cmd_ldr = LD $@
cmd_ldr = $(LD) $(LDFLAGS_$(@F)) \
$(filter-out FORCE,$^) -o $@

u-boot.rom: u-boot-x86-start16.bin u-boot-x86-reset16.bin u-boot.bin \
$(if $(CONFIG_SPL_X86_16BIT_INIT),spl/u-boot-spl.bin) \
$(if $(CONFIG_TPL_X86_16BIT_INIT),tpl/u-boot-tpl.bin) \
$(if $(CONFIG_HAVE_REFCODE),refcode.bin) FORCE
$(call if_changed,binman)

OBJCOPYFLAGS_u-boot-x86-start16.bin := -O binary -j .start16
u-boot-x86-start16.bin: u-boot FORCE
$(call if_changed,objcopy)

OBJCOPYFLAGS_u-boot-x86-reset16.bin := -O binary -j .resetvec
u-boot-x86-reset16.bin: u-boot FORCE
$(call if_changed,objcopy)
endif

ifneq ($(CONFIG_ARCH_SUNXI),)
ifeq ($(CONFIG_ARM64),)
u-boot-sunxi-with-spl.bin: spl/sunxi-spl.bin u-boot.img u-boot.dtb FORCE
$(call if_changed,binman)
else
u-boot-sunxi-with-spl.bin: spl/sunxi-spl.bin u-boot.itb FORCE
$(call if_changed,cat)
endif
endif

ifneq ($(CONFIG_TEGRA),)
ifneq ($(CONFIG_BINMAN),)
# Makes u-boot-dtb-tegra.bin u-boot-tegra.bin u-boot-nodtb-tegra.bin
%-dtb-tegra.bin %-tegra.bin %-nodtb-tegra.bin: \
spl/%-spl %.bin FORCE
$(call if_changed,binman)
else
OBJCOPYFLAGS_u-boot-nodtb-tegra.bin = -O binary --pad-to=$(CONFIG_SYS_TEXT_BASE)
u-boot-nodtb-tegra.bin: spl/u-boot-spl u-boot-nodtb.bin FORCE
$(call if_changed,pad_cat)

OBJCOPYFLAGS_u-boot-tegra.bin = -O binary --pad-to=$(CONFIG_SYS_TEXT_BASE)
u-boot-tegra.bin: spl/u-boot-spl u-boot.bin FORCE
$(call if_changed,pad_cat)

u-boot-dtb-tegra.bin: u-boot-tegra.bin FORCE
$(call if_changed,copy)
endif # binman
endif

OBJCOPYFLAGS_u-boot-app.efi := $(OBJCOPYFLAGS_EFI)
u-boot-app.efi: u-boot FORCE
$(call if_changed,zobjcopy)

u-boot.bin.o: u-boot.bin FORCE
$(call if_changed,efipayload)

u-boot-payload.lds: $(LDSCRIPT_EFI) FORCE
$(call if_changed_dep,cpp_lds)

# Rule to link the EFI payload which contains a stub and a U-Boot binary
quiet_cmd_u-boot_payload ?= LD $@
cmd_u-boot_payload ?= $(LD) $(LDFLAGS_EFI_PAYLOAD) -o $@ \
-T u-boot-payload.lds arch/x86/cpu/call32.o \
lib/efi/efi.o lib/efi/efi_stub.o u-boot.bin.o \
$(addprefix arch/$(ARCH)/lib/,$(EFISTUB))

u-boot-payload: u-boot.bin.o u-boot-payload.lds FORCE
$(call if_changed,u-boot_payload)

OBJCOPYFLAGS_u-boot-payload.efi := $(OBJCOPYFLAGS_EFI)
u-boot-payload.efi: u-boot-payload FORCE
$(call if_changed,zobjcopy)

u-boot-img.bin: spl/u-boot-spl.bin u-boot.img FORCE
$(call if_changed,cat)

#Add a target to create boot binary having SPL binary in PBI format
#concatenated with u-boot binary. It is need by PowerPC SoC having
#internal SRAM <= 512KB.
MKIMAGEFLAGS_u-boot-spl.pbl = -n $(srctree)/$(CONFIG_SYS_FSL_PBL_RCW:"%"=%) \
-R $(srctree)/$(CONFIG_SYS_FSL_PBL_PBI:"%"=%) -T pblimage \
-A $(ARCH) -a $(CONFIG_SPL_TEXT_BASE)

spl/u-boot-spl.pbl: spl/u-boot-spl.bin FORCE
$(call if_changed,mkimage)

ifeq ($(ARCH),arm)
UBOOT_BINLOAD := u-boot.img
else
ifeq ($(CONFIG_MPC85xx)$(CONFIG_OF_SEPARATE),yy)
UBOOT_BINLOAD := u-boot-with-dtb.bin
else
UBOOT_BINLOAD := u-boot.bin
endif
endif

OBJCOPYFLAGS_u-boot-with-spl-pbl.bin = -I binary -O binary --pad-to=$(CONFIG_SPL_PAD_TO) \
--gap-fill=0xff

u-boot-with-spl-pbl.bin: spl/u-boot-spl.pbl $(UBOOT_BINLOAD) FORCE
$(call if_changed,pad_cat)

# PPC4xx needs the SPL at the end of the image, since the reset vector
# is located at 0xfffffffc. So we can't use the "u-boot-img.bin" target
# and need to introduce a new build target with the full blown U-Boot
# at the start padded up to the start of the SPL image. And then concat
# the SPL image to the end.

OBJCOPYFLAGS_u-boot-img-spl-at-end.bin := -I binary -O binary \
--pad-to=$(CONFIG_UBOOT_PAD_TO) --gap-fill=0xff
u-boot-img-spl-at-end.bin: u-boot.img spl/u-boot-spl.bin FORCE
$(call if_changed,pad_cat)

# Create a new ELF from a raw binary file.
ifndef PLATFORM_ELFENTRY
PLATFORM_ELFENTRY = "_start"
endif
quiet_cmd_u-boot-elf ?= LD $@
cmd_u-boot-elf ?= $(LD) u-boot-elf.o -o $@ \
--defsym=$(PLATFORM_ELFENTRY)=$(CONFIG_SYS_TEXT_BASE) \
-Ttext=$(CONFIG_SYS_TEXT_BASE)
u-boot.elf: u-boot.bin
$(Q)$(OBJCOPY) -I binary $(PLATFORM_ELFFLAGS) $< u-boot-elf.o
$(call if_changed,u-boot-elf)

# MediaTek's ARM-based u-boot needs a header to contains its load address
# which is parsed by the BootROM.
# If the SPL build is enabled, the header will be added to the spl binary,
# and the spl binary and the u-boot.img will be combined into one file.
# Otherwise the header will be added to the u-boot.bin directly.

ifeq ($(CONFIG_SPL),y)
spl/u-boot-spl-mtk.bin: spl/u-boot-spl

u-boot-mtk.bin: u-boot.dtb u-boot.img spl/u-boot-spl-mtk.bin FORCE
$(call if_changed,binman)
else
MKIMAGEFLAGS_u-boot-mtk.bin = -T mtk_image \
-a $(CONFIG_SYS_TEXT_BASE) -e $(CONFIG_SYS_TEXT_BASE) \
-n "$(patsubst "%",%,$(CONFIG_MTK_BROM_HEADER_INFO))"

u-boot-mtk.bin: u-boot.bin FORCE
$(call if_changed,mkimage)
endif

ARCH_POSTLINK := $(wildcard $(srctree)/arch/$(ARCH)/Makefile.postlink)

# Rule to link u-boot
# May be overridden by arch/$(ARCH)/config.mk
quiet_cmd_u-boot__ ?= LD $@
cmd_u-boot__ ?= $(LD) $(LDFLAGS) $(LDFLAGS_u-boot) -o $@ \
-T u-boot.lds $(u-boot-init) \
--start-group $(u-boot-main) --end-group \
$(PLATFORM_LIBS) -Map u-boot.map; \
$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true)

quiet_cmd_smap = GEN common/system_map.o
cmd_smap = \
smap=`$(call SYSTEM_MAP,u-boot) | \
awk '$$2 ~ /[tTwW]/ {printf $$1 $$3 "\\\\000"}'` ; \
$(CC) $(c_flags) -DSYSTEM_MAP="\"$${smap}\"" \
-c $(srctree)/common/system_map.c -o common/system_map.o

u-boot: $(u-boot-init) $(u-boot-main) u-boot.lds FORCE
+$(call if_changed,u-boot__)
ifeq ($(CONFIG_KALLSYMS),y)
$(call cmd,smap)
$(call cmd,u-boot__) common/system_map.o
endif

ifeq ($(CONFIG_RISCV),y)
@tools/prelink-riscv $@ 0
endif

quiet_cmd_sym ?= SYM $@
cmd_sym ?= $(OBJDUMP) -t $< > $@
u-boot.sym: u-boot FORCE
$(call if_changed,sym)

# The actual objects are generated when descending,
# make sure no implicit rule kicks in
$(sort $(u-boot-init) $(u-boot-main)): $(u-boot-dirs) ;

# Handle descending into subdirectories listed in $(u-boot-dirs)
# Preset locale variables to speed up the build process. Limit locale
# tweaks to this spot to avoid wrong language settings when running
# make menuconfig etc.
# Error messages still appears in the original language

PHONY += $(u-boot-dirs)
$(u-boot-dirs): prepare scripts
$(Q)$(MAKE) $(build)=$@

tools: prepare
# The "tools" are needed early
$(filter-out tools, $(u-boot-dirs)): tools
# The "examples" conditionally depend on U-Boot (say, when USE_PRIVATE_LIBGCC
# is "yes"), so compile examples after U-Boot is compiled.
examples: $(filter-out examples, $(u-boot-dirs))

define filechk_uboot.release
echo "$(UBOOTVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
endef

# Store (new) UBOOTRELEASE string in include/config/uboot.release
include/config/uboot.release: include/config/auto.conf FORCE
$(call filechk,uboot.release)


# Things we need to do before we recursively start building the kernel
# or the modules are listed in "prepare".
# A multi level approach is used. prepareN is processed before prepareN-1.
# archprepare is used in arch Makefiles and when processed asm symlink,
# version.h and scripts_basic is processed / created.

# Listed in dependency order
PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3

# prepare3 is used to check if we are building in a separate output directory,
# and if so do:
# 1) Check that make has not been executed in the kernel src $(srctree)
prepare3: include/config/uboot.release
ifneq ($(KBUILD_SRC),)
@$(kecho) ' Using $(srctree) as source for U-Boot'
$(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \
echo >&2 " $(srctree) is not clean, please run 'make mrproper'"; \
echo >&2 " in the '$(srctree)' directory.";\
/bin/false; \
fi;
endif

# prepare2 creates a makefile if using a separate output directory
prepare2: prepare3 outputmakefile cfg

prepare1: prepare2 $(version_h) $(timestamp_h) \
include/config/auto.conf
ifeq ($(wildcard $(LDSCRIPT)),)
@echo >&2 " Could not find linker script."
@/bin/false
endif

ifeq ($(CONFIG_USE_DEFAULT_ENV_FILE),y)
prepare1: $(defaultenv_h)
endif

archprepare: prepare1 scripts_basic

prepare0: archprepare FORCE
$(Q)$(MAKE) $(build)=.

# All the preparing..
prepare: prepare0

# Generate some files
# ---------------------------------------------------------------------------

define filechk_version.h
(echo \#define PLAIN_VERSION \"$(UBOOTRELEASE)\"; \
echo \#define U_BOOT_VERSION \"U-Boot \" PLAIN_VERSION; \
echo \#define CC_VERSION_STRING \"$$(LC_ALL=C $(CC) --version | head -n 1)\"; \
echo \#define LD_VERSION_STRING \"$$(LC_ALL=C $(LD) --version | head -n 1)\"; )
endef

# The SOURCE_DATE_EPOCH mechanism requires a date that behaves like GNU date.
# The BSD date on the other hand behaves different and would produce errors
# with the misused '-d' switch. Respect that and search a working date with
# well known pre- and suffixes for the GNU variant of date.
define filechk_timestamp.h
(if test -n "$${SOURCE_DATE_EPOCH}"; then \
SOURCE_DATE="@$${SOURCE_DATE_EPOCH}"; \
DATE=""; \
for date in gdate date.gnu date; do \
$${date} -u -d "$${SOURCE_DATE}" >/dev/null 2>&1 && DATE="$${date}"; \
done; \
if test -n "$${DATE}"; then \
LC_ALL=C $${DATE} -u -d "$${SOURCE_DATE}" +'#define U_BOOT_DATE "%b %d %C%y"'; \
LC_ALL=C $${DATE} -u -d "$${SOURCE_DATE}" +'#define U_BOOT_TIME "%T"'; \
LC_ALL=C $${DATE} -u -d "$${SOURCE_DATE}" +'#define U_BOOT_TZ "%z"'; \
LC_ALL=C $${DATE} -u -d "$${SOURCE_DATE}" +'#define U_BOOT_DMI_DATE "%m/%d/%Y"'; \
LC_ALL=C $${DATE} -u -d "$${SOURCE_DATE}" +'#define U_BOOT_BUILD_DATE 0x%Y%m%d'; \
else \
return 42; \
fi; \
else \
LC_ALL=C date +'#define U_BOOT_DATE "%b %d %C%y"'; \
LC_ALL=C date +'#define U_BOOT_TIME "%T"'; \
LC_ALL=C date +'#define U_BOOT_TZ "%z"'; \
LC_ALL=C date +'#define U_BOOT_DMI_DATE "%m/%d/%Y"'; \
LC_ALL=C date +'#define U_BOOT_BUILD_DATE 0x%Y%m%d'; \
fi)
endef

define filechk_defaultenv.h
(grep -v '^#' | \
grep -v '^$$' | \
tr '\n' '\0' | \
sed -e 's/\\\x0/\n/g' | \
xxd -i ; echo ", 0x00" ; )
endef

$(version_h): include/config/uboot.release FORCE
$(call filechk,version.h)

$(timestamp_h): $(srctree)/Makefile FORCE
$(call filechk,timestamp.h)

$(defaultenv_h): $(CONFIG_DEFAULT_ENV_FILE:"%"=%) FORCE
$(call filechk,defaultenv.h)

# ---------------------------------------------------------------------------
quiet_cmd_cpp_lds = LDS $@
cmd_cpp_lds = $(CPP) -Wp,-MD,$(depfile) $(cpp_flags) $(LDPPFLAGS) \
-D__ASSEMBLY__ -x assembler-with-cpp -std=c99 -P -o $@ $<

u-boot.lds: $(LDSCRIPT) prepare FORCE
$(call if_changed_dep,cpp_lds)

spl/u-boot-spl.bin: spl/u-boot-spl
@:
$(SPL_SIZE_CHECK)

spl/u-boot-spl: tools prepare \
$(if $(CONFIG_OF_SEPARATE)$(CONFIG_OF_EMBED)$(CONFIG_SPL_OF_PLATDATA),dts/dt.dtb) \
$(if $(CONFIG_OF_SEPARATE)$(CONFIG_OF_EMBED)$(CONFIG_TPL_OF_PLATDATA),dts/dt.dtb)
$(Q)$(MAKE) obj=spl -f $(srctree)/scripts/Makefile.spl all

spl/sunxi-spl.bin: spl/u-boot-spl
@:

spl/sunxi-spl-with-ecc.bin: spl/sunxi-spl.bin
@:

spl/u-boot-spl.sfp: spl/u-boot-spl
@:

spl/boot.bin: spl/u-boot-spl
@:

tpl/u-boot-tpl.bin: tools prepare \
$(if $(CONFIG_OF_SEPARATE)$(CONFIG_OF_EMBED)$(CONFIG_SPL_OF_PLATDATA),dts/dt.dtb)
$(Q)$(MAKE) obj=tpl -f $(srctree)/scripts/Makefile.spl all
$(TPL_SIZE_CHECK)

TAG_SUBDIRS := $(patsubst %,$(srctree)/%,$(u-boot-dirs) include)

FIND := find
FINDFLAGS := -L

tags ctags:
ctags -w -o ctags `$(FIND) $(FINDFLAGS) $(TAG_SUBDIRS) \
-name '*.[chS]' -print`
ln -s ctags tags

etags:
etags -a -o etags `$(FIND) $(FINDFLAGS) $(TAG_SUBDIRS) \
-name '*.[chS]' -print`
cscope:
$(FIND) $(FINDFLAGS) $(TAG_SUBDIRS) -name '*.[chS]' -print > \
cscope.files
@find $(TAG_SUBDIRS) -name '*.[chS]' -type l -print | \
grep -xvf - cscope.files > cscope.files.no-symlinks; \
mv cscope.files.no-symlinks cscope.files
cscope -b -q -k

SYSTEM_MAP = \
$(NM) $1 | \
grep -v '\(compiled\)\|\(\.o$$\)\|\( [aUw] \)\|\(\.\.ng$$\)\|\(LASH[RL]DI\)' | \
LC_ALL=C sort
System.map: u-boot
@$(call SYSTEM_MAP,$<) > $@

#########################################################################

# ARM relocations should all be R_ARM_RELATIVE (32-bit) or
# R_AARCH64_RELATIVE (64-bit).
checkarmreloc: u-boot
@RELOC="`$(CROSS_COMPILE)readelf -r -W $< | cut -d ' ' -f 4 | \
grep R_A | sort -u`"; \
if test "$$RELOC" != "R_ARM_RELATIVE" -a \
"$$RELOC" != "R_AARCH64_RELATIVE"; then \
echo "$< contains unexpected relocations: $$RELOC"; \
false; \
fi

tools/version.h: include/version.h
$(Q)mkdir -p $(dir $@)
$(call if_changed,copy)

envtools: scripts_basic $(version_h) $(timestamp_h) tools/version.h
$(Q)$(MAKE) $(build)=tools/env

tools-only: export TOOLS_ONLY=y
tools-only: scripts_basic $(version_h) $(timestamp_h) tools/version.h
$(Q)$(MAKE) $(build)=tools

tools-all: export HOST_TOOLS_ALL=y
tools-all: envtools tools ;

cross_tools: export CROSS_BUILD_TOOLS=y
cross_tools: tools ;

.PHONY : CHANGELOG
CHANGELOG:
git log --no-merges U-Boot-1_1_5.. | \
unexpand -a | sed -e 's/\s\s*$$//' > $@

#########################################################################

###
# Cleaning is done on three levels.
# make clean Delete most generated files
# Leave enough to build external modules
# make mrproper Delete the current configuration, and all generated files
# make distclean Remove editor backup files, patch leftover files and the like

# Directories & files removed with 'make clean'
CLEAN_DIRS += $(MODVERDIR) \
$(foreach d, spl tpl, $(patsubst %,$d/%, \
$(filter-out include, $(shell ls -1 $d 2>/dev/null))))

CLEAN_FILES += include/bmp_logo.h include/bmp_logo_data.h tools/version.h \
boot* u-boot* MLO* SPL System.map fit-dtb.blob* \
u-boot-ivt.img.log u-boot-dtb.imx.log SPL.log u-boot.imx.log \
lpc32xx-* bl31.c bl31.elf bl31_*.bin image.map tispl.bin* \
idbloader.img

# Directories & files removed with 'make mrproper'
MRPROPER_DIRS += include/config include/generated spl tpl \
.tmp_objdiff
MRPROPER_FILES += .config .config.old include/autoconf.mk* include/config.h \
ctags etags tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS \
drivers/video/fonts/*.S

# clean - Delete most, but leave enough to build external modules
#
clean: rm-dirs := $(CLEAN_DIRS)
clean: rm-files := $(CLEAN_FILES)

clean-dirs := $(foreach f,$(u-boot-alldirs),$(if $(wildcard $(srctree)/$f/Makefile),$f))

clean-dirs := $(addprefix _clean_, $(clean-dirs))

PHONY += $(clean-dirs) clean archclean
$(clean-dirs):
$(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)

clean: $(clean-dirs)
$(call cmd,rmdirs)
$(call cmd,rmfiles)
@find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
\( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
-o -name '*.ko.*' -o -name '*.su' -o -name '*.pyc' \
-o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
-o -name '*.lex.c' -o -name '*.tab.[ch]' \
-o -name '*.asn1.[ch]' \
-o -name '*.symtypes' -o -name 'modules.order' \
-o -name modules.builtin -o -name '.tmp_*.o.*' \
-o -name 'dsdt.aml' -o -name 'dsdt.asl.tmp' -o -name 'dsdt.c' \
-o -name '*.efi' -o -name '*.gcno' -o -name '*.so' \) \
-type f -print | xargs rm -f

# mrproper - Delete all generated files, including .config
#
mrproper: rm-dirs := $(wildcard $(MRPROPER_DIRS))
mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
mrproper-dirs := $(addprefix _mrproper_,scripts)

PHONY += $(mrproper-dirs) mrproper archmrproper
$(mrproper-dirs):
$(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)

mrproper: clean $(mrproper-dirs)
$(call cmd,rmdirs)
$(call cmd,rmfiles)
@rm -f arch/*/include/asm/arch

# distclean
#
PHONY += distclean

distclean: mrproper
@find $(srctree) $(RCS_FIND_IGNORE) \
\( -name '*.orig' -o -name '*.rej' -o -name '*~' \
-o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \
-o -name '.*.rej' -o -name '*%' -o -name 'core' \
-o -name '*.pyc' \) \
-type f -print | xargs rm -f
@rm -f boards.cfg CHANGELOG

backup:
F=`basename $(srctree)` ; cd .. ; \
gtar --force-local -zcvf `LC_ALL=C date "+$$F-%Y-%m-%d-%T.tar.gz"` $$F

help:
@echo 'Cleaning targets:'
@echo ' clean - Remove most generated files but keep the config'
@echo ' mrproper - Remove all generated files + config + various backup files'
@echo ' distclean - mrproper + remove editor backup and patch files'
@echo ''
@echo 'Configuration targets:'
@$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
@echo ''
@echo 'Test targets:'
@echo ''
@echo ' check - Run all automated tests that use sandbox'
@echo ' qcheck - Run quick automated tests that use sandbox'
@echo ''
@echo 'Other generic targets:'
@echo ' all - Build all necessary images depending on configuration'
@echo ' tests - Build U-Boot for sandbox and run tests'
@echo '* u-boot - Build the bare u-boot'
@echo ' dir/ - Build all files in dir and below'
@echo ' dir/file.[oisS] - Build specified target only'
@echo ' dir/file.lst - Build specified mixed source/assembly target only'
@echo ' (requires a recent binutils and recent build (System.map))'
@echo ' tags/ctags - Generate ctags file for editors'
@echo ' etags - Generate etags file for editors'
@echo ' cscope - Generate cscope index'
@echo ' ubootrelease - Output the release version string (use with make -s)'
@echo ' ubootversion - Output the version stored in Makefile (use with make -s)'
@echo " cfg - Don't build, just create the .cfg files"
@echo " envtools - Build only the target-side environment tools"
@echo ''
@echo 'Static analysers'
@echo ' checkstack - Generate a list of stack hogs'
@echo ' coccicheck - Execute static code analysis with Coccinelle'
@echo ''
@echo 'Documentation targets:'
@$(MAKE) -f $(srctree)/doc/Makefile dochelp
@echo ''
@echo ' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
@echo ' make V=2 [targets] 2 => give reason for rebuild of target'
@echo ' make O=dir [targets] Locate all output files in "dir", including .config'
@echo ' make C=1 [targets] Check all c source with $$CHECK (sparse by default)'
@echo ' make C=2 [targets] Force check of all c source with $$CHECK'
@echo ' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
@echo ' make W=n [targets] Enable extra gcc checks, n=1,2,3 where'
@echo ' 1: warnings which may be relevant and do not occur too often'
@echo ' 2: warnings which occur quite often but may still be relevant'
@echo ' 3: more obscure warnings, can most likely be ignored'
@echo ' Multiple levels can be combined with W=12 or W=123'
@echo ''
@echo 'Execute "make" or "make all" to build all targets marked with [*] '
@echo 'For further info see the ./README file'

tests check:
$(srctree)/test/run

qcheck:
$(srctree)/test/run quick

# Documentation targets
# ---------------------------------------------------------------------------
DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \
linkcheckdocs dochelp refcheckdocs
PHONY += $(DOC_TARGETS)
$(DOC_TARGETS): scripts_basic FORCE
$(Q)$(MAKE) $(build)=doc $@

endif #ifeq ($(config-targets),1)
endif #ifeq ($(mixed-targets),1)

PHONY += checkstack ubootrelease ubootversion

checkstack:
$(OBJDUMP) -d u-boot $$(find . -name u-boot-spl) | \
$(PERL) $(src)/scripts/checkstack.pl $(ARCH)

ubootrelease:
@echo "$(UBOOTVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"

ubootversion:
@echo $(UBOOTVERSION)

# Single targets
# ---------------------------------------------------------------------------
# Single targets are compatible with:
# - build with mixed source and output
# - build with separate output dir 'make O=...'
# - external modules
#
# target-dir => where to store outputfile
# build-dir => directory in kernel source tree to use

ifeq ($(KBUILD_EXTMOD),)
build-dir = $(patsubst %/,%,$(dir $@))
target-dir = $(dir $@)
else
zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
build-dir = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
endif

%.s: %.c prepare scripts FORCE
$(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
%.i: %.c prepare scripts FORCE
$(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
%.o: %.c prepare scripts FORCE
$(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
%.lst: %.c prepare scripts FORCE
$(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
%.s: %.S prepare scripts FORCE
$(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
%.o: %.S prepare scripts FORCE
$(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
%.symtypes: %.c prepare scripts FORCE
$(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)

# Modules
/: prepare scripts FORCE
$(cmd_crmodverdir)
$(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
$(build)=$(build-dir)
%/: prepare scripts FORCE
$(cmd_crmodverdir)
$(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
$(build)=$(build-dir)
%.ko: prepare scripts FORCE
$(cmd_crmodverdir)
$(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
$(build)=$(build-dir) $(@:.ko=.o)
$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost

quiet_cmd_genenv = GENENV $@
cmd_genenv = $(OBJCOPY) --dump-section .rodata.default_environment=$@ env/common.o; \
sed --in-place -e 's/\x00/\x0A/g' $@

u-boot-initial-env: u-boot.bin
$(call if_changed,genenv)

# Consistency checks
# ---------------------------------------------------------------------------

PHONY += coccicheck

coccicheck:
$(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@

# FIXME Should go into a make.lib or something
# ===========================================================================

quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN $(wildcard $(rm-dirs)))
cmd_rmdirs = rm -rf $(rm-dirs)

quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files)))
cmd_rmfiles = rm -f $(rm-files)

# read all saved command lines

targets := $(wildcard $(sort $(targets)))
cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))

ifneq ($(cmd_files),)
$(cmd_files): ; # Do not try to update included dependency files
include $(cmd_files)
endif

endif # skip-makefile

PHONY += FORCE
FORCE:

# Declare the contents of the .PHONY variable as phony. We keep that
# information in a variable so we can use it in if_changed and friends.
.PHONY: $(PHONY)


移植开始...

在 arch/arm/dts 目录下创建自己开发板对应的设备树文件,在config目录下创建自己板子对应的xxx_config文件








为(本机x86/x64)编译一个Linux内核,工具和源码准备
1.下载交叉编译工具链;2.下载Linux内核源码;3.安装交叉编译工具并配置环境变量
内核安装
make modules_install #安装模块
make install #安装内核


编写内核程序?
暂略......


---- 华丽分割线 ----

下面是Android的一些实践

https://github.com/TeamWin/android_device_qcom_twrp-common

高通源码官网

高通WIKI

Linux内核网站

谷歌关于dtb/dtbo介绍:

https://source.android.com/devices/architecture/dto/partitions

From LineageOS bset-caf-kernel:

https://github.com/LineageOS/scripts/tree/master/best-caf-kernel


目前手里有台LG V50韩版

官方开源了最新的安卓11内核,从官网上我们可以下载到最新的内核源码

解压内核源码,(以下命令没有特别说明,默认在非特权模式,也就是非root用户)

mv kernel/msm-4.14 lmv500n  #重命名并移动到当前目录下

mkdir lmv500n-caf     #新建文件夹,存放caf内核源码

cd lmv500n #这一步是查看当前内核源码的内核版本 make kernelversion #最后一行,输出了4.14.190,如果你不相信,怎么办?查看源码目录下的makefile文件。 cd ../lmv500n-caf #切换源码目录,这一步开始,需要git fetch高通的源码到本地合并 #我目前也不是很清楚这些版本要怎么找,为什么这么做我也不清除,那么我的结果怎么来的呢? #通过github查看大佬们的提交记录

git fetch https://source.codeaurora.org/quic/la/kernel/msm4.14 LA.UM.9.1.r1-08300-SMxxx0.0

#请耐心等待ing git merge FETCH_HEAD #执行完上面命令后将官方的源码拷贝到caf目录下,过程中提示是否要合并啥的全部确认为合并 git add . #将文件添加到git暂存区/添加所有变更后的代码,为上传到github作准备,文中add后面的 (.点) 表示当前目录 git commit -m "你想要添加的提交说明" #你想要添加的提交说明
git branch -M ”lmv500n-caf“git remote add origin you_urlgit push origin lmv500n-caf



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