（二）正点原子STM32MP135移植—

一、TF-A概述

二、编译官方代码

2.1 解压源码

2.2 打补丁

2.3 编译准备

（1）修改Makfile.sdk

（2）设置环境变量

（3）编译

三、移植

3.1 复制官方文件

3.2 修改电源

3.3 修改TF卡和emmc

3.4 添加clk_hse

3.5 删除其他串口

3.6 修改引脚

四、编译

一、TF-A概述

总而言之，和安全相关，篇幅受限，不做详细介绍，可以参考其他博主的帖子，本帖只做移植教程

二、编译官方代码

2.1 解压源码

这里面有一个压缩包，把它解压可以得到源码，根据版本不同，不要照搬，只要能解压出来就行

tar xf tf-a-stm32mp-v2.8.6-stm32mp-r1-r0.tar.xz

特别注意：有一个README.HOW_TO.txt这是官方写给我们的使用文档，完全可以按照里面的方法去编译

2.2 打补丁

官方的源码还是不能编译的，要先打补丁！！！

先进入到源码目录，就是上一步解压出来的文件夹

cd tf-a-stm32mp-v2.8.6-stm32mp-r1-r0.tar.xz
for p in `ls -1 ../*.patch`; do patch -p1 < $p; done

2.3 编译准备

（1）修改Makfile.sdk

编译源码不使用源码目录下的Makefile，使用上一级目录的Makefile.sdk，先对他进行修改。

DEPLOYDIR ?= $(SRC_PATH)/../../FIP_artifacts/arm-trusted-firmware

Makefile.sdk第4行，把DEPLOYDIR目录指向FIP_artifacts下的arm-trusted-firmware，这样编译出来的文件会直接输出到arm-trusted-firmware文件夹，方便后面fiptool打包

TF_A_DEVICETREE ?= stm32mp135f-dk

Makefile.sdk第19行，把其他设备树都给删了，只留下135的板子，之后添加自己板子的时候也要在这里添加

（2）设置环境变量

打开一个终端，之后就不要关闭它了！！！

终端要在源码目录下打开，源码！

source /opt/st/stm32mp1/4.2.1-openstlinux-6.1-yocto-mickledore-mp1-v23.06.21/environment-setup-cortexa7t2hf-neon-vfpv4-ostl-linux-gnueabiexport FIP_DEPLOYDIR_ROOT=$PWD/../../FIP_artifacts

source是要用arm-ostl-linux-gnueabi这个交叉编译器

export是设置FIP的目录，绝对路径或者相对路径都可以，可能写到Makefile.sdk里也可以，可以写一个sh脚本，不用每次都加载这个环境。

注意：笔者交叉编译器安装路径直接默认了，大家安装的时候记得路径记一下

（3）编译

make -f ../Makefile.sdk all

最后提示 Missing u-boot-stm32mp135f-dk.dtb file in folder: '$FIP_DEPLOYDIR_UBOOT' or '$FIP_DEPLOYDIR_ROOT/u-boot'

没有关系，别在意这个，这是因为Makefile.sdk里自动调用fiptool给我们打包了，但是现在又还没有编译u-boot和optee，所以会报这个

最后会在FIP_artifacts/arm-trusted-fimware里生成如下：

1.        tf-a-stm32mp135f-dk-emmc.stm32

2.        tf-a-stm32mp135f-dk-usb.stm32

3.        tf-a-stm32mp135f-dk-uart.stm32

4.        ...(这几个都是.stm32文件，不列了

n.        metadata.bin

n+1.        fwconfig/stm32mp135f-dk-fw-config-optee.dtb

三、移植

修改头文件引用

#include "stm32mp13-pinctrl-atk.dtsi"

3.1 复制官方文件

cd fdts/
cp stm32mp135f-dk.dts stm32mp135-atk.dts
cp stm32mp13-pinctrl.dtsi stm32mp13-pinctrl-atk.dtsi
cp stm32mp135f-dk-fw-config.dts stm32mp135-atk-fw-config.dts
cd ..

3.2 修改电源

最重要的部分就是修改电源配置，ST官方使用的是电源管理芯片，而正点原子考虑成本因素使用分立电源的设计。

打开stm32mp135-atk.dts文件，第67行开始的代码，这一部分的代码全部删了，是ST官方关于电源的描述

&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";pmic: stpmic@33 {compatible = "st,stpmic1";reg = <0x33>;status = "okay";regulators {compatible = "st,stpmic1-regulators";buck1-supply = <&vin>;buck2-supply = <&vin>;buck3-supply = <&vin>;buck4-supply = <&vin>;ldo1-supply = <&vin>;ldo4-supply = <&vin>;ldo5-supply = <&vin>;ldo6-supply = <&vin>;vref_ddr-supply = <&vin>;pwr_sw1-supply = <&bst_out>;pwr_sw2-supply = <&v3v3_ao>;vddcpu: buck1 {regulator-name = "vddcpu";regulator-min-microvolt = <1250000>;regulator-max-microvolt = <1250000>;regulator-always-on;regulator-over-current-protection;};vdd_ddr: buck2 {regulator-name = "vdd_ddr";regulator-min-microvolt = <1350000>;regulator-max-microvolt = <1350000>;regulator-always-on;regulator-over-current-protection;};vdd: buck3 {regulator-name = "vdd";regulator-min-microvolt = <3300000>;regulator-max-microvolt = <3300000>;regulator-always-on;st,mask-reset;regulator-over-current-protection;};vddcore: buck4 {regulator-name = "vddcore";regulator-min-microvolt = <1250000>;regulator-max-microvolt = <1250000>;regulator-always-on;regulator-over-current-protection;};vdd_adc: ldo1 {regulator-name = "vdd_adc";regulator-min-microvolt = <3300000>;regulator-max-microvolt = <3300000>;};vdd_usb: ldo4 {regulator-name = "vdd_usb";regulator-min-microvolt = <3300000>;regulator-max-microvolt = <3300000>;};vdd_sd: ldo5 {regulator-name = "vdd_sd";regulator-min-microvolt = <3300000>;regulator-max-microvolt = <3300000>;regulator-boot-on;};v1v8_periph: ldo6 {regulator-name = "v1v8_periph";regulator-min-microvolt = <1800000>;regulator-max-microvolt = <1800000>;};vref_ddr: vref_ddr {regulator-name = "vref_ddr";regulator-always-on;};bst_out: boost {regulator-name = "bst_out";};v3v3_sw: pwr_sw2 {regulator-name = "v3v3_sw";regulator-active-discharge = <1>;regulator-always-on;};};};
};

然后在第49行代码之后，补上我们对电源的描述↓↓

vddcore: regulator-vddcore {compatible = "regulator-fixed";regulator-name = "vddcore";regulator-min-microvolt = <1250000>;regulator-max-microvolt = <1250000>;regulator-off-in-suspend;regulator-always-on;};vddcpu: regulator-vddcpu {compatible = "regulator-fixed";regulator-name = "vddcpu";regulator-min-microvolt = <1350000>;regulator-max-microvolt = <1350000>;regulator-off-in-suspend;regulator-always-on;};v3v3: regulator-v3v3 {compatible = "regulator-fixed";regulator-name = "v3v3";regulator-min-microvolt = <3300000>;regulator-max-microvolt = <3300000>;regulator-off-in-suspend;regulator-always-on;};vdd: regulator-vdd {compatible = "regulator-fixed";regulator-name = "vdd";regulator-min-microvolt = <3300000>;regulator-max-microvolt = <3300000>;regulator-off-in-suspend;regulator-always-on;};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;};

这里有一个天坑！！！天真的我以为改了设备树就好了，如果就这么改，压根跑不起来，烧录的时候卡死在第一步

找了全网，只找到一个帖子提到了，我们添加了电源描述之后，还要去一个文件里修改电源描述的数量。

在plat\st\stm32mp1下的stm32mp1_def.h里，第695行有一个

#define PLAT_NB_FIXED_REGUS		U(6)
/* 把它改成电源描述数量+1 */

3.3 修改TF卡和emmc

找到sdmmc1这个节点（就在stm32mp135-atk.dts下），删掉它，替换成我们的

&sdmmc1 {pinctrl-names = "default";pinctrl-0 = <&sdmmc1_b4_pins_a &sdmmc1_clk_pins_a>;disable-wp;st,neg-edge;no-1-8-v;bus-width = <4>;vmmc-supply = <&v3v3>;status = "okay";
};&sdmmc2 {pinctrl-names = "default";pinctrl-0 = <&sdmmc2_b4_pins_a &sdmmc2_b4_b7_pins_a &sdmmc2_clk_pins_a>;non-removable;st,neg-edge;mmc-ddr-3_3v;no-1-8-v;bus-width = <8>;vmmc-supply = <&v3v3>;vqmmc-supply = <&v3v3>;status = "okay";
};

3.4 添加clk_hse

在末尾添加一个节点

&clk_hse {st,digbypass;
};

3.5 删除其他串口

ST官方板子有uart1和uart8，我们把它删掉，只留下uart4

	aliases {serial0 = &uart4;serial1 = &usart1;// serial2 = &uart8;// serial3 = &usart2;};

&uart8 {pinctrl-names = "default";pinctrl-0 = <&uart8_pins_a>;status = "disabled";
};&usart1 {pinctrl-names = "default";pinctrl-0 = <&usart1_pins_a>;uart-has-rtscts;status = "disabled";
};

然后打开stm32mp13-bl2.dtsi文件，我们把对应删了的引脚也给删掉

// /omit-if-no-ref/ &i2c4_pins_a;
/omit-if-no-ref/ &sdmmc1_b4_pins_a;
/omit-if-no-ref/ &sdmmc1_clk_pins_a;
/omit-if-no-ref/ &sdmmc2_b4_pins_a;
/omit-if-no-ref/ &sdmmc2_clk_pins_a;
/omit-if-no-ref/ &uart4_pins_a;
// /omit-if-no-ref/ &uart8_pins_a;
// /omit-if-no-ref/ &usart1_pins_a;

3.6 修改引脚

切换到stm32mp13-pinctrl-atk.dtsi文件，这里为了方便，直接复制了原子的文件，也可以对照着修改，笔者直接用原子的文件替换掉了，代码如下

// SPDX-License-Identifier: (GPL-2.0+ OR BSD-3-Clause)
/** Copyright (C) STMicroelectronics 2019 - All Rights Reserved* Author: Alexandre Torgue <alexandre.torgue@st.com>*/
#include <dt-bindings/pinctrl/stm32-pinfunc.h>&pinctrl {sdmmc1_b4_pins_a: sdmmc1-b4-0 {pins {pinmux = <STM32_PINMUX('C', 8, AF12)>, /* SDMMC1_D0 */<STM32_PINMUX('C', 9, AF12)>, /* SDMMC1_D1 */<STM32_PINMUX('C', 10, AF12)>, /* SDMMC1_D2 */<STM32_PINMUX('C', 11, AF12)>, /* SDMMC1_D3 */<STM32_PINMUX('D', 2, AF12)>; /* SDMMC1_CMD */slew-rate = <1>;drive-push-pull;bias-disable;};};sdmmc1_clk_pins_a: sdmmc1-clk-0 {pins {pinmux = <STM32_PINMUX('C', 12, AF12)>; /* SDMMC1_CK */slew-rate = <1>;drive-push-pull;bias-disable;};};sdmmc2_b4_pins_a: sdmmc2-b4-0 {pins {pinmux = <STM32_PINMUX('B', 14, AF10)>, /* SDMMC2_D0 */<STM32_PINMUX('B', 15, AF10)>, /* SDMMC2_D1 */<STM32_PINMUX('B', 3, AF10)>, /* SDMMC2_D2 */<STM32_PINMUX('B', 4, AF10)>, /* SDMMC2_D3 */<STM32_PINMUX('G', 6, AF10)>; /* SDMMC2_CMD */slew-rate = <1>;drive-push-pull;bias-pull-up;};};sdmmc2_b4_b7_pins_a: sdmmc2-b4-b7-0 {pins {pinmux = <STM32_PINMUX('F', 0, AF10)>, /* SDMMC2_D4 */<STM32_PINMUX('B', 9, AF10)>, /* SDMMC2_D5 */<STM32_PINMUX('C', 6, AF10)>, /* SDMMC2_D6 */				 <STM32_PINMUX('C', 7, AF10)>; /* SDMMC2_D7 */slew-rate = <1>;drive-push-pull;bias-pull-up;};};sdmmc2_clk_pins_a: sdmmc2-clk-0 {pins {pinmux = <STM32_PINMUX('E', 3, AF10)>; /* SDMMC2_CK */slew-rate = <1>;drive-push-pull;bias-pull-up;};};uart4_pins_a: uart4-0 {pins1 {pinmux = <STM32_PINMUX('D', 6, AF8)>; /* UART4_TX */bias-disable;drive-push-pull;slew-rate = <0>;};pins2 {pinmux = <STM32_PINMUX('D', 8, AF8)>; /* UART4_RX */bias-pull-up;};};
};