1.  概述

   
   

本文将以 MYIR 的 MYC-LD25X 核心模块及MYD-LD25X开发平台为例，讲解如何使用 STM32CubeMX 来实现Developer package最小系统和外设资源的配置。

2. 修改设备树（接上一期）

查看生成的Bring up工程空文件的设备树，CA35的设备树文件夹，其他的是M33核的工程资料。

我们可以看到生成的设备树文件如下

myir@myir-vm:/mnt/hgfs/ShareWorkspace/stm32mp25x-bringup/Bringup/CA35/DeviceTree/Bringup$ tree -l

.

├── kernel

│   ├── stm32mp257d-bringup-mx.dts

│   └── stm32mp257d-bringup-mx-resmem.dtsi

├── optee-os

│   ├── stm32mp257d-bringup-mx.dts

│   ├── stm32mp257d-bringup-mx-rcc.dtsi

│   ├── stm32mp257d-bringup-mx-resmem.dtsi

│   └── stm32mp257d-bringup-mx-rif.dtsi

├── tf-a

│   ├── stm32mp257d-bringup-mx.dts

│   ├── stm32mp257d-bringup-mx-fw-config.dts

│   ├── stm32mp257d-bringup-mx-rcc.dtsi

│   └── stm32mp25-mx.dtsi

└── u-boot

    ├── stm32mp257d-bringup-mx.dts

    ├── stm32mp257d-bringup-mx-resmem.dtsi

    └── stm32mp257d-bringup-mx-u-boot.dtsi

4 directories, 13 files

以上的设备树已经配置了大部分内容的工程，但是工程是还无法全部启动，我们需要先把设备树同步到相应的BSP代码中。

stm32mp25x-BringUp-bsp.tar.gz已拷贝并解压到虚拟机：/home/myir。

 注：windows和ubuntu之间目录共享

myir@myir-vm:~/stm32mp25x-BringUp-bsp$ tree -L 2

.

├── Bringup

│   ├── Bringup.ioc

│   ├── CA35

│   ├── CM33

│   ├── Common

│   └── Drivers

├── build

├── FIP_artifacts

│   ├── arm-trusted-firmware

│   ├── fip

│   ├── flash-all.sh

│   ├── FlashLayout_emmc_stm32mp25x-bringup-mx.tsv

│   ├── flash.sh

│   ├── optee

│   └── u-boot

├── myir-st-optee

│   ├── fiptool-stm32mp

│   ├── Makefile.sdk

│   ├── myir-st-external-dt

│   ├── myir-st-optee

│   └── README

├── myir-st-tfa

│   ├── fiptool-stm32mp

│   ├── Makefile.sdk

│   └── tf-a-myir

├── myir-st-uboot

│   ├── fiptool-stm32mp

│   ├── Makefile.sdk

│   └── u-boot-myir

└── stm32mp-ddr-phy-A2022.11-r0

    ├── README.HOW_TO.txt

    └── stm32mp-ddr-phy-A2022.11

19 directories, 13 files

 在“虚拟机设置”选项中设置完成后， 启动虚拟机执行如下命令进行挂载：

 myir@myir-vm# sudo vmhgfs-fuse .host:/ /mnt/hgfs -o allow_other

sudo 密码为：123456 

在虚拟机的/mnt/hgfs目录下已经成功挂载上共享的目录，如未挂载上，可以重新启动下虚拟机。

/home/myir/目录为我这边虚拟机的目录，实际目录以自己本机为准。

tf-a设备树软链接：

myir@myir-vm:/mnt/hgfs/ShareWorkspace#  ln -s /mnt/hgfs/ShareWorkspace/Bringup/CA35/DeviceTree/bringup/tf-a/* /home/myir/stm32mp25x-BringUp-bsp/myir-st-tfa/tf-a-myir/fdts/

Optee-os设备树stm32mp257d-bringup-mx.dts和stm32mp257d-bringup-mx-rcc.dtsi软链接：

myir@myir-vm:/mnt/hgfs/ShareWorkspace# ln -s /mnt/hgfs/ShareWorkspace/Bringup/CA35/DeviceTree/bringup/optee-os/stm32mp257d-bringup-mx.dts /home/myir/stm32mp25x-BringUp-bsp/myir-st-optee/myir-st-optee/core/arch/arm/dts/

root@myir-vm:/mnt/hgfs/ShareWorkspace# ln -s /mnt/hgfs/ShareWorkspace/Bringup/CA35/DeviceTree/bringup/optee-os/stm32mp257d-bringup-mx-rcc.dtsi /home/myir/stm32mp25x-BringUp-bsp/myir-st-optee/myir-st-optee/core/arch/arm/dts/

Optee-os设备树stm32mp257d-bringup-mx-resmem.dtsi和stm32mp257d-bringup-mx-rif.dtsi直接使用SourceCode压缩包Optee-os目录中的文件，可通过软链接或者拷贝的方式放到stm32mp25x-BringUp-bsp/myir-st-optee/myir-st-optee/core/arch/arm/dts/目录下。

Uboot设备树软链接：

myir@myir-vm:/mnt/hgfs/ShareWorkspace# ln -s /mnt/hgfs/ShareWorkspace/Bringup/CA35/DeviceTree/bringup/u-boot/* /home/myir/stm32mp25x-BringUp-bsp/myir-st-uboot/u-boot-myir/arch/arm/dts/

Kernel设备树软链接：

Note: STM32CubeMX 的规则是先生成 Kernel 的 dts, 然后将生成的 dts 文件拷贝到 u-boot 目录下，也就是说 u-boot 的设备树 stm32mp257d-bringup-mx.dts 是从 kernel 目录拷贝过来的，所以在 U-Boot 阶段修改设备树，添加 User code 时，请同步修改 kernel 的设备树或者将修改好的设备树拷贝到 Kernel 目录，防止下次使用 CubeMX 生成设备树的时候，u-boot 部分的修改被 kernel 未修改的设备树覆盖。

2.1. 配置和编译TF-A

需要手动添加 TF-A 阶段的串口配置的 user code. 使用文本编辑工具打开生成的 打开 TF-A 设备树(BringupCA35DeviceTreeBringuptf-astm32mp257d-bringup-mx.dts)

添加头文件

/* USER CODE BEGIN includes */

#include 'stm32mp25xf.dtsi'

#include 'stm32mp25-pinctrl.dtsi'

/* USER CODE END includes */

在”USER CODE BEGIN root”位置添加”chosen”和”aliases”节点：

/* USER CODE BEGIN root */

aliases {

 serial0 = &usart2;

};

chosen {

 stdout-path = 'serial0:115200n8';

 };

/* USER CODE END root */

增加PMIC配置

&i2c7{

 pinctrl-names = 'default';

 pinctrl-0 = <&i2c7_pins_mx>;

 status = 'okay';

 /* USER CODE BEGIN i2c7 */

 pmic2: stpmic@33 {

  compatible = 'st,stpmic2';

  reg = <0x33>;

  status = 'okay';

  regulators {

   compatible = 'st,stpmic2-regulators';

   vddcpu: buck1 {

    regulator-name = 'vddcpu';

    regulator-min-microvolt = <800000>;

    regulator-max-microvolt = <910000>;

    regulator-always-on;

   };

   vddcore: buck2 {

    regulator-name = 'vddcore';

    regulator-min-microvolt = <820000>;

    regulator-max-microvolt = <820000>;

    regulator-always-on;

   };

   vddgpu: buck3 {

    regulator-name = 'vddgpu';

    regulator-min-microvolt = <800000>;

    regulator-max-microvolt = <900000>;

    regulator-always-on;

   };

   vddio_pmic: buck4 {

    regulator-name = 'vddio_pmic';

    regulator-min-microvolt = <3300000>;

    regulator-max-microvolt = <3300000>;

    regulator-always-on;

   };

   v1v8: buck5 {

    regulator-name = 'v1v8';

    regulator-min-microvolt = <1800000>;

    regulator-max-microvolt = <1800000>;

    regulator-always-on;

   };

   vdd2_ddr: buck6 {

    regulator-name = 'vdd2_ddr';

    regulator-min-microvolt = <1100000>;

    regulator-max-microvolt = <1100000>;

   };

   v3v3: buck7 {

    regulator-name = 'v3v3';

    regulator-min-microvolt = <3300000>;

    regulator-max-microvolt = <3300000>;

    regulator-always-on;

   };

   vdda1v8_aon: ldo1 {

    regulator-name = 'vdda1v8_aon';

    regulator-min-microvolt = <1800000>;

    regulator-max-microvolt = <1800000>;

    regulator-always-on;

   };

   vdd_emmc: ldo2 {

    regulator-name = 'vdd_emmc';

    regulator-min-microvolt = <3300000>;

    regulator-max-microvolt = <3300000>;

    regulator-always-on;

   };

   vdd1_ddr: ldo3 {

    regulator-name = 'vdd1_ddr';

    regulator-min-microvolt = <1800000>;

    regulator-max-microvolt = <1800000>;

    regulator-enable-ramp-delay = <1000>;

   };

   vdd3v3_usb: ldo4 {

    regulator-name = 'vdd3v3_usb';

    regulator-min-microvolt = <3300000>;

    regulator-max-microvolt = <3300000>;

    regulator-always-on;

   };

   v5v_hdmi: ldo5 {

    regulator-name = 'v5v_hdmi';

    regulator-min-microvolt = <2000000>;

    regulator-max-microvolt = <2000000>;

   };

   vdd_sdcard: ldo7 {

    regulator-name = 'vdd_sdcard';

    regulator-min-microvolt = <3300000>;

    regulator-max-microvolt = <3300000>;

    regulator-always-on;

   };

   vddio_sdcard: ldo8 {

    regulator-name = 'vddio_sdcard';

    st,regulator-bypass-microvolt = <3300000>;

    regulator-min-microvolt = <3300000>;

    regulator-max-microvolt = <3300000>;

    regulator-always-on;

   };

  };

 };

 /* USER CODE END i2c7 */

};

&ddr{

 status = 'okay';

 /* USER CODE BEGIN ddr */

 vdd1-supply = <&vdd1_ddr>;

 vdd2-supply = <&vdd2_ddr>;

 vddq-supply = <&vdd2_ddr>;

 /* USER CODE END ddr */

};

使用文本编辑工具打开生成的 打开 TF-A 设备树(BringupCA35DeviceTreeBringuptf-astm32mp257d-bringup-mx-fw-config.dts)

本次配置不涉及防火墙内容，因此屏蔽如下内容：

/*      st-mem-firewall {

                bl31_context: bl31-context@81ff0000 {

                        reg = <0x0 0x81ff0000 0x0 0x10000>;

                        st,protreg = ;

                };

                op_tee: op-tee@82000000 {

                        reg = <0x0 0x82000000 0x0 0x2000000>;

                        st,protreg = ;