移植好st的tf-a文件后，修改自己板子对应的设备树，注意备份
设备树在tf-a/tf-a-stm32mp-2.2.r1/fdts中

stm32mp157d-szm.dts:

// SPDX-License-Identifier: (GPL-2.0+ OR BSD-3-Clause)
/** Copyright (C) STMicroelectronics 2019 - All Rights Reserved* Author: Shao Zheming <957510530@qq.com> for study.*/
/dts-v1/;#include "stm32mp157.dtsi"
#include "stm32mp15xd.dtsi"
#include "stm32mp15-pinctrl.dtsi"
#include "stm32mp15xxaa-pinctrl.dtsi"
#include "stm32mp15xx-szm.dtsi" /* edx系列的通用开发文件，同样需要备份修改 */
#include <dt-bindings/soc/st,stm32-etzpc.h>/ {model = "STMicroelectronics STM32MP157D eval daughter";compatible = "st,stm32mp157d-ed1", "st,stm32mp157";chosen {stdout-path = "serial0:115200n8"; /* 标准输出serial0，不是开发板上的 */};aliases {serial0 = &uart4; /* 设置serial0是对应开发板的串口4 */};
};&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)>;
};

stm32mp157d-szm.dtsi:

删除vin和PMIC节点

// 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>;};/* 2022/05/18 shaozheming 修改 18-52 加入相关电源 *//* 芯片内核电源 */vddcore: regulator-vddcore {compatible = "regulator-fixed";regulator-name = "vddcore";regulator-min-microvolt = <1200000>;regulator-max-microvolt = <1350000>;regulator-off-in-suspend;regulator-always-on;};/* 描述3.3电源 */v3v3: regulator-3p3v {compatible = "regulator-fixed";regulator-name = "v3v3";regulator-min-microvolt = <3300000>;regulator-max-microvolt = <3300000>;regulator-off-in-suspend;regulator-always-on;};/* 描述vdd */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电源 */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;};
};&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_RUNSTM32_PM_CSTOP_ALLOW_LP_STOPSTM32_PM_CSTOP_ALLOW_LPLV_STOPSTM32_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_PLL1PCLK_AXI_PLL2PCLK_MCU_PLL3PCLK_PLL12_HSECLK_PLL3_HSECLK_PLL4_HSECLK_RTC_LSECLK_MCO1_DISABLEDCLK_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_HSECLK_FMC_ACLKCLK_QSPI_ACLKCLK_ETH_DISABLEDCLK_SDMMC12_PLL4PCLK_DSI_DSIPLLCLK_STGEN_HSECLK_USBPHY_HSECLK_SPI2S1_PLL3QCLK_SPI2S23_PLL3QCLK_SPI45_HSICLK_SPI6_HSICLK_I2C46_HSICLK_SDMMC3_PLL4PCLK_USBO_USBPHYCLK_ADC_CKPERCLK_CEC_LSECLK_I2C12_HSICLK_I2C35_HSICLK_UART1_HSICLK_UART24_HSICLK_UART35_HSICLK_UART6_HSICLK_UART78_HSICLK_SPDIF_PLL4PCLK_FDCAN_PLL4RCLK_SAI1_PLL3QCLK_SAI2_PLL3QCLK_SAI3_PLL3QCLK_SAI4_PLL3QCLK_RNG1_LSICLK_RNG2_LSICLK_LPTIM1_PCLK1CLK_LPTIM23_PCLK3CLK_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";
};
/* 2022/05/18 shaozheming 226-245 修改sd卡设置*/
&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";
};
/* 2022/05/18 shaozheming 259-268 修改USB_OTG */
&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>;
};

编译

serialboot修改

我们构建的系统烧写目录中，用到了正点原子出厂镜像中的stm32mp157datk-serialboot.stm32，前面讲了，STM32CubeProgrammer 首先通过 USB 或串口向开发板下载stm32mp157d-atk-serialboot.stm32，名字里面有个“serialboot”，翻译过来就是串行启动，此镜像主要用于初始化 DDR，并且提供 USB 或串口功能，目的是为了进一步将 uboot 镜像下载到 DDR的指定位置，最终通过 uboot 来向外部 flash 设备烧写整个系统镜像。