步骤

1. 对源码进行解压

tar -xvf tf-a-stm32mp-2.2.r2-r0.tar.gz

2. 将补丁文件全打上

for p in `ls -1 ../*.patch`; do patch -p1 < $p; done

3. 配置交叉编译工具链，在TF-A顶层目录下打开Makefile.sdk文件修改，搜索cross_compile，然后进行相应的修改

4. 复制设备树

• 进入到 tf-a 源码目录,添加设备树文件

cp fdts/stm32mp15xx-dkx.dtsi fdts/stm32mp15xx-fsmp1x.dtsi
cp fdts/stm32mp157a-dk1.dts fdts/stm32mp157a-fsmp1a.dts

• 再在顶层目录下修改Makefile.sdk中的TFA_DEVICETREE配置项，加上 stm32mp157a-fsmp1a
  
• 以及修改 fdts/stm32mp157a-fsmp1a.dts中的头文件将

#include "stm32mp15xx-dkx.dtsi"改为#include "stm32mp15xx-fsmp1x.dtsi"

5. 编译

执行如下指令编译：

time make -j4 -f ../Makefile.sdk TFA_DEVICETREE=stm32mp157a-fsmp1a all

6. 查找镜像文件

• 进入镜像文件的下载目录：

cd ../build/trusted/

• 生成了相应的文件
  

7. 测试

• 执行如下指令烧写 u-boot到TF卡中

sudo dd if=tf-a-stm32mp157a-fsmp1a-trusted.stm32 of=/dev/sdb1 conv=fdatasync
sudo dd if=tf-a-stm32mp157a-fsmp1a-trusted.stm32 of=/dev/sdb2 conv=fdatasync
sudo dd if=u-boot-stm32mp157a-fsmp1a-trusted.stm32  of=/dev/sdb3 conv=fdatasync

• 将TF卡插入开发板中，上电后出现错误提示
  

8. 修改设备树电源配置

• 将原有的DK1相关电源配置删除
  • 修改 fdts/stm32mp15xx-fsmp1x.dtsi 文件
  • 将文件中 i2c4 节点相关内容整体删除，并将cpu0和cpu1相关内容删除
• 添加固定电源配置
  • 根节点末尾位置添加如下内容

    v3v3: regulator-3p3v {
    compatible = "regulator-fixed";
    regulator-name = "v3v3";
    regulator-min-microvolt = <3300000>;
    regulator-max-microvolt = <3300000>;
    regulator-always-on;
    regulator-boot-on;
    };
    v1v8_audio: regulator-v1v8-audio {
    compatible = "regulator-fixed";
    regulator-name = "v1v8_audio";
    regulator-min-microvolt = <1800000>;
    regulator-max-microvolt = <1800000>;
    regulator-always-on;
    regulator-boot-on;
    };
    v3v3_hdmi: regulator-v3v3-hdmi {
     compatible = "regulator-fixed";
     regulator-name = "v3v3_hdmi";
     regulator-min-microvolt = <3300000>;
     regulator-max-microvolt = <3300000>;
     regulator-always-on;
    regulator-boot-on;
    };
    v1v2_hdmi: regulator-v1v2-hdmi {
    compatible = "regulator-fixed";
    regulator-name = "v1v2_hdmi";
    regulator-min-microvolt = <1200000>;
    regulator-max-microvolt = <1200000>;
    regulator-always-on;
    regulator-boot-on;
    };
    vdd: regulator-vdd {
    compatible = "regulator-fixed";
    regulator-name = "vdd";
    regulator-min-microvolt = <3300000>;
    regulator-max-microvolt = <3300000>;
    regulator-always-on;
    regulator-boot-on;
    };
    vdd_usb: regulator-vdd-usb {
    compatible = "regulator-fixed";
    regulator-name = "vdd_usb";
    regulator-min-microvolt = <3300000>;
    regulator-max-microvolt = <3300000>;
    regulator-always-on;
    regulator-boot-on;
    };
    

9.再次编译并将源码烧写到TF中观察结果