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（六）正点原子STM32MP135移植——内核移植

news 2025/12/9 21:13:18

一、概述

二、编译官方代码

三、移植

四、编译

一、概述

前面已经移植好了TF-A、optee、u-boot，在u-boot能正常跑起来的情况下，现在来移植内核。

二、编译官方代码

进入kernel目录

2.1 解压源码、打补丁

/* 解压源码 */
tar xf linux-6.1.28.tar.xz/* 进入源码目录 */
cd linux-6.1.28//* 打补丁 */
for p in `ls -1 ../*.patch`; do patch -p1 < $p; done

2.2 配置Kernel

根据官方手册进行配置即可

/* 配置交叉编译器 */
source /opt/st/stm32mp1/4.2.1-openstlinux-6.1-yocto-mickledore-mp1-v23.06.21/environment-setup-cortexa7t2hf-neon-vfpv4-ostl-linux-gnueabi /* 输出文件夹 */
export OUTPUT_BUILD_DIR=$PWD/../build
mkdir -p ${OUTPUT_BUILD_DIR}/* 默认配置文件 */
make ARCH=arm O="${OUTPUT_BUILD_DIR}" multi_v7_defconfig fragment*.config

2.3 编译内核

编译模块好像要好久，可以不要编译

/* 编译uImage 设备树 */
make ARCH=arm uImage vmlinux dtbs LOADADDR=0xC2000040 O="${OUTPUT_BUILD_DIR}"/* 编译模块 */
make ARCH=arm modules O="${OUTPUT_BUILD_DIR}"/* 配置输出文件路径 */
make ARCH=arm INSTALL_MOD_PATH="${OUTPUT_BUILD_DIR}/install_artifact" modules_install O="${OUTPUT_BUILD_DIR}"
mkdir -p ${OUTPUT_BUILD_DIR}/install_artifact/boot//* 拷贝输出文件 */
cp ${OUTPUT_BUILD_DIR}/arch/arm/boot/uImage ${OUTPUT_BUILD_DIR}/install_artifact/boot/
cp ${OUTPUT_BUILD_DIR}/arch/arm/boot/dts/st*.dtb ${OUTPUT_BUILD_DIR}/install_artifact/boot/

这时候去查看build/install_artifact目录下，有boot和lib两个文件夹，boot里有uImage和设备树，lib里是内核模块

三、移植

3.1 复制文件

/* 进入设备树目录 */
cd arch/arm/boot/dts/cp stm32mp135f-dk.dts stm32mp135-atk.dts
cp stm32mp13-pinctrl.dtsi stm32mp135-pinctrl-atk.dtsi/* 回到源码根目录 */
cd ../../../../

3.2 修改头文件

打开stm32mp135-atk.dts，把引脚头文件改成我们的

// #include "stm32mp13-pinctrl.dtsi"
#include "stm32mp13-pinctrl-atk.dtsi"

3.3 修改电源

首先找到&scmi_regu节点，全都干掉

// &scmi_regu {
// 	scmi_vddcpu: voltd-vddcpu {
// 		reg = <VOLTD_SCMI_STPMIC1_BUCK1>;
// 		regulator-name = "vddcpu";
// 	};
// 	scmi_vdd: voltd-vdd {
// 		reg = <VOLTD_SCMI_STPMIC1_BUCK3>;
// 		regulator-name = "vdd";
// 	};
// 	scmi_vddcore: voltd-vddcore {
// 		reg = <VOLTD_SCMI_STPMIC1_BUCK4>;
// 		regulator-name = "vddcore";
// 	};
// 	scmi_vdd_adc: voltd-vdd-adc {
// 		reg = <VOLTD_SCMI_STPMIC1_LDO1>;
// 		regulator-name = "vdd_adc";
// 	};
// 	scmi_vdd_usb: voltd-vdd-usb {
// 		reg = <VOLTD_SCMI_STPMIC1_LDO4>;
// 		regulator-name = "vdd_usb";
// 	};
// 	scmi_vdd_sd: voltd-vdd-sd {
// 		reg = <VOLTD_SCMI_STPMIC1_LDO5>;
// 		regulator-name = "vdd_sd";
// 	};
// 	scmi_v1v8_periph: voltd-v1v8-periph {
// 		reg = <VOLTD_SCMI_STPMIC1_LDO6>;
// 		regulator-name = "v1v8_periph";
// 	};
// 	scmi_v3v3_sw: voltd-v3v3-sw {
// 		reg = <VOLTD_SCMI_STPMIC1_PWR_SW2>;
// 		regulator-name = "v3v3_sw";
// 	};
// };

去根节点下添加我们对电源的描述，找到v3v3_ao这个节点，把它删了，替换成我们的

	// v3v3_ao: v3v3-ao {// 	compatible = "regulator-fixed";// 	regulator-name = "v3v3_ao";// 	regulator-min-microvolt = <3300000>;// 	regulator-max-microvolt = <3300000>;// 	regulator-always-on;// };
vddcore: vddcore {compatible = "regulator-fixed";regulator-name = "vddcore";regulator-min-microvolt = <1250000>;regulator-max-microvolt = <1250000>;regulator-off-in-suspend;regulator-always-on;};vddcpu: vddcpu {compatible = "regulator-fixed";regulator-name = "vddcpu";regulator-min-microvolt = <1350000>;regulator-max-microvolt = <1350000>;regulator-off-in-suspend;regulator-always-on;};v3v3: v3v3 {compatible = "regulator-fixed";regulator-name = "v3v3";regulator-min-microvolt = <3300000>;regulator-max-microvolt = <3300000>;regulator-off-in-suspend;regulator-always-on;};vbus_otg: vbus_otg {compatible = "regulator-fixed";regulator-name = "vbus_otg";regulator-min-microvolt = <5000000>;regulator-max-microvolt = <5000000>;regulator-off-in-suspend;regulator-always-on;};vdd: vdd {compatible = "regulator-fixed";regulator-name = "vdd";regulator-min-microvolt = <3300000>;regulator-max-microvolt = <3300000>;regulator-off-in-suspend;regulator-always-on;};vdd_usb: vdd_usb {compatible = "regulator-fixed";regulator-name = "vdd_usb";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-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;};

3.4 添加看门狗

由于笔者前面移植u-boot、optee、TF-A哪里遗忘了一个iwdg2，正点原子使用的是iwdg2，而ST官方使用的是arm_wdt，如果前面用到了iwdg2，那就在这里添加上，如果没有则pass这一部分

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

3.5 修改网络

找到eth1和eth2，修改成正点原子的

&eth1 {status = "okay";pinctrl-0 = <&eth1_rgmii_pins_a>;pinctrl-1 = <&eth1_rgmii_sleep_pins_a>;pinctrl-names = "default", "sleep";phy-mode = "rgmii-id";max-speed = <1000>;phy-handle = <&phy0_eth1>;nvmem-cells = <&ethernet_mac1_address>;nvmem-cell-names = "mac-address";mdio1 {#address-cells = <1>;#size-cells = <0>;compatible = "snps,dwmac-mdio";phy0_eth1: ethernet-phy@1 {reg = <1>;};};
};&eth2 {status = "okay";pinctrl-0 = <&eth2_rgmii_pins_a>;pinctrl-1 = <&eth2_rgmii_sleep_pins_a>;pinctrl-names = "default", "sleep";phy-mode = "rgmii-id";max-speed = <1000>;phy-handle = <&phy0_eth2>;phy-supply = <&v3v3>;nvmem-cells = <&ethernet_mac2_address>;nvmem-cell-names = "mac-address";mdio1 {#address-cells = <1>;#size-cells = <0>;compatible = "snps,dwmac-mdio";phy0_eth2: ethernet-phy@2 {reg = <2>;};};
};

3.6 修改sdmmc

找到sdmmc1和sdmmc2，修改成我们的

&sdmmc1 {pinctrl-names = "default", "opendrain", "sleep";pinctrl-0 = <&sdmmc1_b4_pins_a &sdmmc1_clk_pins_a>;pinctrl-1 = <&sdmmc1_b4_od_pins_a &sdmmc1_clk_pins_a>;pinctrl-2 = <&sdmmc1_b4_sleep_pins_a>;cd-gpios = <&gpiof 15 (GPIO_ACTIVE_LOW | GPIO_PULL_UP)>;st,neg-edge;no-1-8-v;bus-width = <4>;vmmc-supply = <&v3v3>;#address-cells = <1>;#size-cells = <0>;status = "okay";
};/* EMMC */
&sdmmc2 {pinctrl-names = "default", "opendrain", "sleep";pinctrl-0 = <&sdmmc2_b4_pins_a &sdmmc2_b4_b7_pins_a &sdmmc2_clk_pins_a>;pinctrl-1 = <&sdmmc2_b4_od_pins_a &sdmmc2_b4_b7_od_pins_a &sdmmc2_clk_pins_a>;pinctrl-2 = <&sdmmc2_b4_sleep_pins_a &sdmmc2_b4_b7_sleep_pins_a>;non-removable;st,neg-edge;mmc-ddr-3_3v;no-1-8-v;bus-width = <8>;vmmc-supply = <&v3v3>;keep-power-in-suspend;#address-cells = <1>;#size-cells = <0>;status = "okay";
};

3.7 删掉其它

如果根文件系统是在emmc里，只需要修改一个sdmmc2能用就行；如果根文件系统需要通过nfs挂载，那就需要修改eth1和eth2节点。而对于其他部分，USB、OTG、LCD等外设，都是可以删除的，这些都是正点原子会讲会移植的东西，所以笔者在这里把不需要的外设全部移除

1.        usbh_ehci、usbotg_hs、usbphyc、usbphyc_port0、usbphyc_port1

2.        usart1、 usart2、uart8

3.        timers3、timers4、timers8、timers14

4.        spi5

5.        rtc

6.        ltdc

7.        i2c1、i2c5

8.        dcmipp

9.        adc1

10.      根节点下：gpio-keys、leds、panel_backlight、panel_rgb、wake_up、wifi_pwrseq

删除之后可以得到一个相对精简的设备树：

// SPDX-License-Identifier: (GPL-2.0+ OR BSD-3-Clause)
/** Copyright (C) STMicroelectronics 2021 - All Rights Reserved* Author: Alexandre Torgue <alexandre.torgue@foss.st.com> for STMicroelectronics.*//dts-v1/;#include <dt-bindings/gpio/gpio.h>
#include <dt-bindings/input/input.h>
#include <dt-bindings/leds/common.h>
#include <dt-bindings/regulator/st,stm32mp13-regulator.h>
#include <dt-bindings/rtc/rtc-stm32.h>
#include "stm32mp135.dtsi"
#include "stm32mp13xf.dtsi"
#include "stm32mp13-pinctrl-atk.dtsi"/ {model = "ATK STM32MP135-ATK Discovery Board";compatible = "st,stm32mp135-ATK", "st,stm32mp135";aliases {ethernet0 = &eth1;ethernet1 = &eth2;serial0 = &uart4;};chosen {stdout-path = "serial0:115200n8";#address-cells = <1>;#size-cells = <1>;ranges;framebuffer {compatible = "simple-framebuffer";clocks = <&rcc LTDC_PX>;status = "disabled";};};clocks {clk_ext_camera: clk-ext-camera {#clock-cells = <0>;compatible = "fixed-clock";clock-frequency = <24000000>;};clk_mco1: clk-mco1 {#clock-cells = <0>;compatible = "fixed-clock";clock-frequency = <24000000>;};};memory@c0000000 {device_type = "memory";reg = <0xc0000000 0x20000000>;};reserved-memory {#address-cells = <1>;#size-cells = <1>;ranges;optee@dd000000 {reg = <0xdd000000 0x3000000>;no-map;};};vddcore: vddcore {compatible = "regulator-fixed";regulator-name = "vddcore";regulator-min-microvolt = <1250000>;regulator-max-microvolt = <1250000>;regulator-off-in-suspend;regulator-always-on;};vddcpu: vddcpu {compatible = "regulator-fixed";regulator-name = "vddcpu";regulator-min-microvolt = <1350000>;regulator-max-microvolt = <1350000>;regulator-off-in-suspend;regulator-always-on;};v3v3: v3v3 {compatible = "regulator-fixed";regulator-name = "v3v3";regulator-min-microvolt = <3300000>;regulator-max-microvolt = <3300000>;regulator-off-in-suspend;regulator-always-on;};vbus_otg: vbus_otg {compatible = "regulator-fixed";regulator-name = "vbus_otg";regulator-min-microvolt = <5000000>;regulator-max-microvolt = <5000000>;regulator-off-in-suspend;regulator-always-on;};vdd: vdd {compatible = "regulator-fixed";regulator-name = "vdd";regulator-min-microvolt = <3300000>;regulator-max-microvolt = <3300000>;regulator-off-in-suspend;regulator-always-on;};vdd_usb: vdd_usb {compatible = "regulator-fixed";regulator-name = "vdd_usb";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-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;};
};&iwdg2 {timeout-sec = <32>;status = "okay";
};&arm_wdt {timeout-sec = <32>;status = "okay";
};&crc1 {status = "okay";
};&cryp {status = "okay";
};&dts {status = "okay";
};&eth1 {status = "okay";pinctrl-0 = <&eth1_rgmii_pins_a>;pinctrl-1 = <&eth1_rgmii_sleep_pins_a>;pinctrl-names = "default", "sleep";phy-mode = "rgmii-id";max-speed = <1000>;phy-handle = <&phy0_eth1>;nvmem-cells = <&ethernet_mac1_address>;nvmem-cell-names = "mac-address";mdio1 {#address-cells = <1>;#size-cells = <0>;compatible = "snps,dwmac-mdio";phy0_eth1: ethernet-phy@1 {reg = <1>;};};
};&eth2 {status = "okay";pinctrl-0 = <&eth2_rgmii_pins_a>;pinctrl-1 = <&eth2_rgmii_sleep_pins_a>;pinctrl-names = "default", "sleep";phy-mode = "rgmii-id";max-speed = <1000>;phy-handle = <&phy0_eth2>;phy-supply = <&v3v3>;nvmem-cells = <&ethernet_mac2_address>;nvmem-cell-names = "mac-address";mdio1 {#address-cells = <1>;#size-cells = <0>;compatible = "snps,dwmac-mdio";phy0_eth2: ethernet-phy@2 {reg = <2>;};};
};&sdmmc1 {pinctrl-names = "default", "opendrain", "sleep";pinctrl-0 = <&sdmmc1_b4_pins_a &sdmmc1_clk_pins_a>;pinctrl-1 = <&sdmmc1_b4_od_pins_a &sdmmc1_clk_pins_a>;pinctrl-2 = <&sdmmc1_b4_sleep_pins_a>;cd-gpios = <&gpiof 15 (GPIO_ACTIVE_LOW | GPIO_PULL_UP)>;st,neg-edge;no-1-8-v;bus-width = <4>;vmmc-supply = <&v3v3>;#address-cells = <1>;#size-cells = <0>;status = "okay";
};/* EMMC */
&sdmmc2 {pinctrl-names = "default", "opendrain", "sleep";pinctrl-0 = <&sdmmc2_b4_pins_a &sdmmc2_b4_b7_pins_a &sdmmc2_clk_pins_a>;pinctrl-1 = <&sdmmc2_b4_od_pins_a &sdmmc2_b4_b7_od_pins_a &sdmmc2_clk_pins_a>;pinctrl-2 = <&sdmmc2_b4_sleep_pins_a &sdmmc2_b4_b7_sleep_pins_a>;non-removable;st,neg-edge;mmc-ddr-3_3v;no-1-8-v;bus-width = <8>;vmmc-supply = <&v3v3>;keep-power-in-suspend;#address-cells = <1>;#size-cells = <0>;status = "okay";
};&uart4 {pinctrl-names = "default", "sleep", "idle";pinctrl-0 = <&uart4_pins_a>;pinctrl-1 = <&uart4_sleep_pins_a>;pinctrl-2 = <&uart4_idle_pins_a>;/delete-property/dmas;/delete-property/dma-names;status = "okay";
};

3.8 修改引脚

由于前面删了很多无关外设，引脚我们只需要复制原子的部分即可：eth1、eth2、emmc1、emmc2

// SPDX-License-Identifier: (GPL-2.0+ OR BSD-3-Clause)
/** Copyright (C) STMicroelectronics 2021 - All Rights Reserved* Author: Alexandre Torgue <alexandre.torgue@foss.st.com>*/
#include <dt-bindings/pinctrl/stm32-pinfunc.h>&pinctrl {eth1_rgmii_pins_a: eth1-rgmii-1 {pins1 {pinmux = <STM32_PINMUX('F', 12, AF11)>, /* ETH1_RGMII_CLK125 */<STM32_PINMUX('C', 1, AF11)>, 	/* ETH1_RGMII_GTX_CLK */<STM32_PINMUX('G', 13, AF11)>, /* ETH1_RGMII_TXD0 */<STM32_PINMUX('G', 14, AF11)>, /* ETH1_RGMII_TXD1 */<STM32_PINMUX('C', 2, AF11)>, 	/* ETH1_RGMII_TXD2 */<STM32_PINMUX('E', 5, AF10)>, 	/* ETH1_RGMII_TXD3 */<STM32_PINMUX('B', 11, AF11)>, /* ETH1_RGMII_TX_CTL */<STM32_PINMUX('A', 2, AF11)>, 	/* ETH1_MDIO */<STM32_PINMUX('G', 2, AF11)>; 	/* ETH1_MDC */bias-disable;drive-push-pull;slew-rate = <2>;};pins2 {pinmux = <STM32_PINMUX('C', 4, AF11)>, /* ETH1_RGMII_RXD0 */<STM32_PINMUX('C', 5, AF11)>, /* ETH1_RGMII_RXD1 */<STM32_PINMUX('B', 0, AF11)>, /* ETH1_RGMII_RXD2 */<STM32_PINMUX('B', 1, AF11)>, /* ETH1_RGMII_RXD3 */<STM32_PINMUX('A', 1, AF11)>, /* ETH1_RGMII_RX_CLK */<STM32_PINMUX('A', 7, AF11)>; /* ETH1_RGMII_RX_CTL */bias-disable;};};eth1_rgmii_sleep_pins_a: eth1-rgmii-sleep-1 {pins1 {pinmux = <STM32_PINMUX('F', 12, ANALOG)>, /* ETH1_RGMII_CLK125 */<STM32_PINMUX('C', 1, ANALOG)>, 	/* ETH1_RGMII_GTX_CLK */<STM32_PINMUX('G', 13, ANALOG)>, 	/* ETH1_RGMII_TXD0 */<STM32_PINMUX('G', 14, ANALOG)>, 	/* ETH1_RGMII_TXD1 */<STM32_PINMUX('C', 2, ANALOG)>, 	/* ETH1_RGMII_TXD2 */<STM32_PINMUX('E', 5, ANALOG)>, 	/* ETH1_RGMII_TXD3 */<STM32_PINMUX('B', 11, ANALOG)>, 	/* ETH1_RGMII_TX_CTL */<STM32_PINMUX('A', 2, ANALOG)>, 	/* ETH1_MDIO */<STM32_PINMUX('G', 2, ANALOG)>, 	/* ETH1_MDC */<STM32_PINMUX('C', 4, ANALOG)>, 	/* ETH1_RGMII_RXD0 */<STM32_PINMUX('C', 5, ANALOG)>, 	/* ETH1_RGMII_RXD1 */<STM32_PINMUX('B', 0, ANALOG)>, 	/* ETH1_RGMII_RXD2 */<STM32_PINMUX('B', 1, ANALOG)>, 	/* ETH1_RGMII_RXD3 */<STM32_PINMUX('A', 1, ANALOG)>, 	/* ETH1_RGMII_RX_CLK */<STM32_PINMUX('A', 7, ANALOG)>; 	/* ETH1_RGMII_RX_CTL */};};eth2_rgmii_pins_a: eth2-rgmii-2 {pins1 {pinmux = <STM32_PINMUX('H', 2, AF13)>, /* ETH2_RGMII_CLK125 */<STM32_PINMUX('F', 7, AF11)>, 	/* ETH2_RGMII_TXD0 */<STM32_PINMUX('G', 11, AF10)>, /* ETH2_RGMII_TXD1 */<STM32_PINMUX('G', 1, AF10)>, 	/* ETH2_RGMII_TXD2 */<STM32_PINMUX('E', 6, AF11)>, 	/* ETH2_RGMII_TXD3 */<STM32_PINMUX('G', 3, AF10)>, 	/* ETH2_RGMII_GTX_CLK */<STM32_PINMUX('F', 6, AF11)>, 	/* ETH2_RGMII_TX_CTL */<STM32_PINMUX('B', 2, AF11)>, 	/* ETH2_MDIO */<STM32_PINMUX('G', 5, AF10)>; 	/* ETH2_MDC */bias-disable;drive-push-pull;slew-rate = <2>;};pins2 {pinmux = <STM32_PINMUX('F', 4, AF11)>, /* ETH2_RGMII_RXD0 */<STM32_PINMUX('E', 2, AF10)>, 	/* ETH2_RGMII_RXD1 */<STM32_PINMUX('H', 6, AF12)>, 	/* ETH2_RGMII_RXD2 */<STM32_PINMUX('A', 8, AF11)>, 	/* ETH2_RGMII_RXD3 */<STM32_PINMUX('H', 11, AF11)>, /* ETH2_RGMII_RX_CLK */<STM32_PINMUX('G', 12, AF12)>; /* ETH2_RGMII_RX_CTL */bias-disable;};};eth2_rgmii_sleep_pins_a: eth2-rgmii-sleep-2 {pins1 {pinmux = <STM32_PINMUX('H', 2, ANALOG)>, /* ETH2_RGMII_CLK125 */<STM32_PINMUX('F', 7, ANALOG)>, 	/* ETH2_RGMII_TXD0 */<STM32_PINMUX('G', 11, ANALOG)>, 	/* ETH2_RGMII_TXD1 */<STM32_PINMUX('G', 1, ANALOG)>, 	/* ETH2_RGMII_TXD2 */<STM32_PINMUX('E', 6, ANALOG)>, 	/* ETH2_RGMII_TXD3 */<STM32_PINMUX('G', 3, ANALOG)>, 	/* ETH2_RGMII_GTX_CLK */<STM32_PINMUX('F', 6, ANALOG)>, 	/* ETH2_RGMII_TX_CTL */<STM32_PINMUX('B', 2, ANALOG)>, 	/* ETH2_MDIO */<STM32_PINMUX('G', 5, ANALOG)>, 	/* ETH2_MDC */<STM32_PINMUX('F', 4, ANALOG)>, 	/* ETH2_RGMII_RXD0 */<STM32_PINMUX('E', 2, ANALOG)>, 	/* ETH2_RGMII_RXD1 */<STM32_PINMUX('H', 6, ANALOG)>, 	/* ETH2_RGMII_RXD2 */<STM32_PINMUX('A', 8, ANALOG)>, 	/* ETH2_RGMII_RXD3 */<STM32_PINMUX('H', 11, ANALOG)>, 	/* ETH2_RGMII_RX_CLK */<STM32_PINMUX('G', 12, ANALOG)>; 	/* ETH2_RGMII_RX_CTL */};};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_b4_od_pins_a: sdmmc1-b4-od-0 {pins1 {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 */slew-rate = <1>;drive-push-pull;bias-disable;};pins2 {pinmux = <STM32_PINMUX('D', 2, AF12)>; /* SDMMC1_CMD */slew-rate = <1>;drive-open-drain;bias-disable;};};sdmmc1_b4_sleep_pins_a: sdmmc1-b4-sleep-0 {pins {pinmux = <STM32_PINMUX('C', 8, ANALOG)>, /* SDMMC1_D0 */<STM32_PINMUX('C', 9, ANALOG)>, /* SDMMC1_D1 */<STM32_PINMUX('C', 10, ANALOG)>, /* SDMMC1_D2 */<STM32_PINMUX('C', 11, ANALOG)>, /* SDMMC1_D3 */<STM32_PINMUX('C', 12, ANALOG)>, /* SDMMC1_CK */<STM32_PINMUX('D', 2, ANALOG)>; /* SDMMC1_CMD */};};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_b4_od_pins_a: sdmmc2-b4-od-0 {pins1 {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 */slew-rate = <1>;drive-push-pull;bias-pull-up;};pins2 {pinmux = <STM32_PINMUX('G', 6, AF10)>; /* SDMMC2_CMD */slew-rate = <1>;drive-open-drain;bias-pull-up;};};sdmmc2_b4_b7_od_pins_a: sdmmc2-b4-b7-od-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_b4_sleep_pins_a: sdmmc2-b4-sleep-0 {pins {pinmux = <STM32_PINMUX('B', 14, ANALOG)>, /* SDMMC2_D0 */<STM32_PINMUX('B', 15, ANALOG)>, /* SDMMC2_D1 */<STM32_PINMUX('B', 3, ANALOG)>, /* SDMMC2_D2 */<STM32_PINMUX('B', 4, ANALOG)>, /* SDMMC2_D3 */<STM32_PINMUX('E', 3, ANALOG)>, /* SDMMC2_CK */<STM32_PINMUX('G', 6, ANALOG)>; /* SDMMC2_CMD */};};sdmmc2_b4_b7_sleep_pins_a: sdmmc2-b4-b7-sleep-0 {pins {pinmux = <STM32_PINMUX('F', 0, ANALOG)>, /* SDMMC2_D4 */<STM32_PINMUX('B', 9, ANALOG)>, /* SDMMC2_D5 */<STM32_PINMUX('C', 6, ANALOG)>, /* SDMMC2_D6 */				 <STM32_PINMUX('C', 7, ANALOG)>; /* SDMMC2_D7 */};};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;};};uart4_idle_pins_a: uart4-idle-0 {pins1 {pinmux = <STM32_PINMUX('D', 6, ANALOG)>; /* UART4_TX */};pins2 {pinmux = <STM32_PINMUX('D', 8, AF8)>; /* UART4_RX */bias-pull-up;};};uart4_sleep_pins_a: uart4-sleep-0 {pins {pinmux = <STM32_PINMUX('D', 6, ANALOG)>, /* UART4_TX */<STM32_PINMUX('D', 8, ANALOG)>; /* UART4_RX */};};
};

3.9 修改Makefile

在源码目录下arch/arm/boot/dts/这个目录里有一个Makefile，找到里面的stm32

dtb-$(CONFIG_ARCH_STM32) += \stm32f429-disco.dtb \stm32f469-disco.dtb \stm32f746-disco.dtb \stm32f769-disco.dtb \stm32429i-eval.dtb \stm32746g-eval.dtb \stm32h743i-eval.dtb \stm32h743i-disco.dtb \stm32h750i-art-pi.dtb \stm32mp135f-dk.dtb \stm32mp135f-dk-a7-examples.dtb \stm32mp151a-prtt1a.dtb \stm32mp151a-prtt1c.dtb \stm32mp151a-prtt1s.dtb \stm32mp153c-dhcom-drc02.dtb \stm32mp153c-dhcor-drc-compact.dtb \stm32mp157a-avenger96.dtb \stm32mp157a-dhcor-avenger96.dtb \stm32mp157a-dk1.dtb \stm32mp157a-dk1-a7-examples.dtb \stm32mp157a-dk1-m4-examples.dtb \stm32mp157a-ed1.dtb \stm32mp157a-ev1.dtb \stm32mp157a-ev1-a7-examples.dtb \stm32mp157a-ev1-m4-examples.dtb \stm32mp157a-iot-box.dtb \stm32mp157a-microgea-stm32mp1-microdev2.0.dtb \stm32mp157a-microgea-stm32mp1-microdev2.0-of7.dtb \stm32mp157a-icore-stm32mp1-ctouch2.dtb \stm32mp157a-icore-stm32mp1-ctouch2-of10.dtb \stm32mp157a-icore-stm32mp1-edimm2.2.dtb \stm32mp157a-stinger96.dtb \stm32mp157c-dhcom-pdk2.dtb \stm32mp157c-dhcom-picoitx.dtb \stm32mp157c-dk2.dtb \stm32mp157c-dk2-a7-examples.dtb \stm32mp157c-dk2-m4-examples.dtb \stm32mp157c-ed1.dtb \stm32mp157c-emsbc-argon.dtb \stm32mp157c-ev1.dtb \stm32mp157c-ev1-a7-examples.dtb \stm32mp157c-ev1-m4-examples.dtb \stm32mp157c-lxa-mc1.dtb \stm32mp157c-odyssey.dtb \stm32mp157d-dk1.dtb \stm32mp157d-dk1-a7-examples.dtb \stm32mp157d-dk1-m4-examples.dtb \stm32mp157d-ed1.dtb \stm32mp157d-ev1.dtb \stm32mp157d-ev1-a7-examples.dtb \stm32mp157d-ev1-m4-examples.dtb \stm32mp157f-dk2.dtb \stm32mp157f-dk2-a7-examples.dtb \stm32mp157f-dk2-m4-examples.dtb \stm32mp157f-ed1.dtb \stm32mp157f-ev1.dtb \stm32mp157f-ev1-a7-examples.dtb \stm32mp157f-ev1-m4-examples.dtb \

添加上我们的设备树，或者全删了只留我们自己的设备树

dtb-$(CONFIG_ARCH_STM32) += \stm32mp135-atk.dtb

至此，内核所需要修改的文件已全部完成。

四、编译

4.1 配置内核

在这里笔者遇到一个问题，内核编译后直接跑，会提示无法修改CPU主频，然后上网找到了需要配置内核：

/* 打开Linux图形化配置界面 */
make ARCH=arm O="${OUTPUT_BUILD_DIR}" menuconfig

->CPU Power Management

        ->CPU Frequency scaling

                ->[*]        CPU frequency transition statistics

                        ->        Default CPUFreq governor(userspace)

把CPUFreq改为userspace这个选项

cp ../build/.config arch/arm/configs/stm32mp135_atk_defconfig

把配置文件保存为我们的默认配置文件，以便下次使用

4.2 编译

/* 编译内核、设备树 */
make ARCH=arm uImage vmlinux dtbs LOADADDR=0xC2000040 O="${OUTPUT_BUILD_DIR}"/* 复制文件到输出文件夹 */
cp ${OUTPUT_BUILD_DIR}/arch/arm/boot/uImage ${OUTPUT_BUILD_DIR}/install_artifact/boot/
cp ${OUTPUT_BUILD_DIR}/arch/arm/boot/dts/st*.dtb ${OUTPUT_BUILD_DIR}/install_artifact/boot/

这时候查看build/install_artifact/boot文件夹，会发现有刚刚编译好的uImage和stm32mp135-atk.dtb，剩下的烧写就就可以根据原子的详细教程就行了

4.3 nfs挂载根文件系统

这里可能有个小小的坑，在设备树中，ethernet0是eth1，ethernet1是eth2，所以用nfs挂根文件系统的时候，应该选eth0或eth1。反正大家可以多尝试几个。

笔者用tftp和nfs启动内核：

setenv bootcmd 'tftp c2000000 uImage;tftp c4000000 stm32mp135-atk.dtb;bootm c2000000 - c4000000'
setenv bootargs 'console=ttySTM0,115200 root=/dev/nfs nfsroot=192.168.1.2:/home/zhangrl/Linux/nfs/rootfs,proto=tcp rw ip=192.168.1.3:192.168.1.2:192.168.1.1:255.255.255.0::eth1:off'

4.4 emmc挂根文件系统

烧写到emmc中的时候，先去uboot里查看自己的内核在emmc的哪一个分区，rootfs在哪一个分区：

使用ext4ls命令，对一个一个分区进行扫描，直到看到自己的分区（笔者只会这个笨方法）

ext4ls:

第一个参数mmc，设备，选择mmc设备

第二个参数1，选择mmc1，就是我们的emmc

第三个参数，选择分区，一个一个试

知道自己的分区之后，就可以该bootcmd和bootargs:

setenv bootcmd  'ext4load mmc 1:6 c2000000 uImage;ext4load mmc 1:6 c4000000 stm32mp135-atk.dtb;bootm c2000000 - c4000000'
setenv bootargs 'console=ttySTM0,115200 root=/dev/mmcblk1p7 rootwait rw'

至此，STM32MP135的全套移植教程完成，补上了正点原子的空白，剩下的根文件系统直接跟正点原子的教程即可，使用buildroot和busybox都可以。笔者今年刚学Linux，从i.mx6ull学完过来，对Linux的理解可能并不到位

如果文章有错误，希望大家指正

一、概述

二、编译官方代码

2.1 解压源码、打补丁

2.2 配置Kernel

2.3 编译内核

三、移植

3.1 复制文件

3.2 修改头文件

3.3 修改电源

3.4 添加看门狗

3.5 修改网络

3.6 修改sdmmc

3.7 删掉其它

3.8 修改引脚

3.9 修改Makefile

四、编译

4.1 配置内核

4.2 编译

4.3 nfs挂载根文件系统

4.4 emmc挂根文件系统

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