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IMX6ULL-移植uboot-imx

报关员培训•2022-11-6•随笔•阅读39

IMX6ULL-移植uboot-imx,第1张

IMX6ULL-移植uboot-imx

作者：zzssdd2

E-mail：zzssdd2@foxmail.com

一、说明
  • 主机系统：Ubuntu 20.04.3 LTS
  • 开发板：TOPEET-IMX6ULL
  • Uboot版本：imx_v2020.04_5.4.70_2.3.0
  • 交叉编译器：gcc-arm-10.3-2021.07-x86_64-arm-none-linux-gnueabihf
二、环境搭建 2.1、uboot源码

  1. 获取NXP维护的uboot源码：

    git clone https://source.codeaurora.org/external/imx/uboot-imx

  2. 使用命令git branch -a查看分支然后切换到目标分支

    git checkout imx_v2020.04_5.4.70_2.3.0

  3. 接下来就基于该分支源码进行uboot的移植(根目录下README文件有助于了解uboot的编译移植)

2.2、交叉编译器

  1. 在armDeveloper网站下载交叉编译工具

    GNU Toolchain for the A-profile Architecture: 10.3-2021.07
|
|__ x86_64 Linux hosted cross compilers
	|
	|__ AArch32 target with hard float (arm-linux-none-gnueabihf)
		|
		|__ gcc-arm-10.3-2021.07-x86_64-arm-none-linux-gnueabihf.tar.xz

  2. 将工具解压至本地

    # 创建文件夹
sudo mkdir /usr/local/arm
# 拷贝文件
sudo cp gcc-arm-10.3-2021.07-x86_64-arm-none-linux-gnueabihf.tar.xz /usr/local/arm/
# 解压文件
sudo tar -vxf /usr/local/arm/gcc-arm-10.3-2021.07-x86_64-arm-none-linux-gnueabihf.tar.xz

  3. 可以导入工具链到环境变量中

    # 导入到系统环境变量(对所有用户有效)
sudo vim /etc/profile
export PATH=$PATH:/usr/local/arm/gcc-arm-10.3-2021.07-x86_64-arm-none-linux-gnueabihf/bin
# 或导入到用户环境变量(仅对当前用户有效)
sudo vim ~/.bashrc 
export PATH=$PATH:/usr/local/arm/gcc-arm-10.3-2021.07-x86_64-arm-none-linux-gnueabihf/bin
三、编译源码

手上的开发板参考NXP官方的EVK开发板设计，所以移植都是参考mx6ullevk开发板相关代码进行

  1. 查看board/freescale/mx6ullevk文件夹下面的README文件说明

  2. 新建编译脚本文件make.sh 并增加可执行权限chmod +x make.sh

#!/bin/bash

# 若之前已经导入到环境变量则不需要
export PATH=$PATH:/usr/local/arm/gcc-arm-10.3-2021.07-x86_64-arm-none-linux-gnueabihf/bin
# 若已经在顶层Makefile文件中指定则不需要
export ARCH=arm
# 若已经在顶层Makefile文件中指定则不需要
export CROSS_COMPILE=arm-none-linux-gnueabihf-

make distclean
# make mrproper
make mx6ull_14x14_evk_emmc_defconfig
make

  1. 执行编译./make.sh并等待完成。

  2. 编译源码这一步的目的：一是为了验证编译环境是否正常；二是为了下一步移植过程中的代码分析（一些文件只有在编译后才会生成）

注意：若是在系统上第一次编译uboot源码可能会遇到缺少bison、flex的报错信息导致编译失败，只需安装后重新执行编译即可

# 语法分析工具
sudo apt install bison 
# 词法分析工具
sudo apt install flex
四、移植 4.1、工程管理

  1. Ubuntu上安装VScode

  2. uboot源码根目录创建文件夹.vscode。使用VScode打开uboot源码文件夹，然后点击文件->将工作区另存为...保存文件名uboot.code-workspace在.vscode文件夹下。内容如下

    {
	"folders": [
		{
			"path": ".."
		}
	],

	"settings": {
		"files.associations": {
			"*.cfg": "c",
			"*.S": "c",
		}
	}
}

  3. 为了便于文件分析，在搜索和源码中隐藏一些不需要的文件，保留imx6相关文件。在.vscode目录下新建文件settings.json，添加以下内容

    {
    "search.exclude": {
        "**/node_modules": true,
        "**/bower_components": true,
        "**.git": true,
        "**/.svn": true,
        "**/.hg": true,
        "**/CVS": true,
        "**/.DS_Store": true,
        "**/Thumbs.db": true,

        "arch/ar[!m]":true,
        "arch/m*":true,
        "arch/n*":true,
        "arch/p*":true,
        "arch/r*":true,
        "arch/s*":true,
        "arch/x*":true,
        "arch/arm/mach-[a-h,j-z]*":true,
        "arch/arm/mach-i[!m]*":true,
        "arch/arm/mach-imx/i*":true,
        "arch/arm/mach-imx/mx[!6]*":true,
        "arch/arm/cpu/arm[!v]*":true,
        "arch/arm/cpu/armv7m":true,
        "arch/arm/cpu/armv8":true,
        "arch/arm/cpu/pxa":true,
        "arch/arm/cpu/sa1100":true,
        "arch/arm/dts/[a-h,j-z,A-L,N-Z]*":true,
        "arch/arm/dts/imx[!6]*":true,
        "board/[a-e,g-z,0-9,A-Z]*":true,
        "board/fir*":true,
        "board/freescale/[a-l,n-z,A-Z]*":true,
        "board/freescale/m[!x]*":true,
        "board/freescale/mx[!6]*":true,
        "configs/[0-9,a-l,n-z,A-Z]*":true,
        "configs/m[!x]*":true,
        "configs/mx[!6]*":true,
        "include/configs/[0-9,a-l,n-z,A-Z]*":true,
        "include/configs/m[!x]*":true,
        "include/configs/mx[!6]*":true,
    }
}

  4. 安装C/C++插件。在.vscode目录下新建文件c_cpp_properties.json内容如下

    {
    "configurations": [
        {
            "name": "Linux",
            "includePath": [
                "${default}"
            ],
            "compilerPath": "/usr/bin/gcc",
            "cStandard": "gnu11",
            "cppStandard": "gnu++14",
            "intelliSenseMode": "linux-gcc-x64",

            "forcedInclude": ["${workspaceFolder}/u-boot.cfg"]
        }
    ],
    "version": 4
}

    u-boot.cfg文件为uboot编译后生成的文件，里面包含源码中的宏定义配置。

4.2、添加文件

这一步主要是参考mx6ullevk开发板在源码中添加自己的开发板文件

  1. 添加配置文件

    cp configs/mx6ull_14x14_evk_emmc_defconfig configs/mx6ull_14x14_topeet_emmc_defconfig

    cp include/configs/mx6ullevk.h include/configs/mx6ull_topeet.h

  2. 添加开发板文件夹

    cp -r board/freescale/mx6ullevk/ board/freescale/mx6ull_topeet/

    更改文件名：

    mv board/freescale/mx6ull_topeet/mx6ullevk.c board/freescale/mx6ull_topeet/mx6ull_topeet.c

  3. 添加设备树文件

    新版本uboot更多的参考了Linux内核引入了设备树和驱动模型(Driver Model)。所以移植内容就更多的是设备树文件的修改。

    1. imx6ull-14x14-topeet-emmc.dts文件：

      添加：

      cp arch/arm/dts/imx6ull-14x14-evk-emmc.dts arch/arm/dts/imx6ull-14x14-topeet-emmc.dts

      修改：

      #include "imx6ull-14x14-evk.dts"
改为
#include "imx6ull-14x14-topeet.dts"

    2. imx6ull-14x14-topeet.dts文件：

      添加

      cp arch/arm/dts/imx6ull-14x14-evk.dts arch/arm/dts/imx6ull-14x14-topeet.dts

      修改：

      #include "imx6ul-14x14-evk.dtsi"
#include "imx6ul-14x14-evk-u-boot.dtsi"
改为
#include "imx6ul-14x14-topeet.dtsi"
#include "imx6ul-14x14-topeet-u-boot.dtsi"

    3. 添加 imx6ul-14x14-topeet.dtsi和imx6ul-14x14-topeet-u-boot.dtsi文件

      cp arch/arm/dts/imx6ul-14x14-evk.dtsi arch/arm/dts/imx6ul-14x14-topeet.dtsi

      cp arch/arm/dts/imx6ul-14x14-evk-u-boot.dtsi arch/arm/dts/imx6ul-14x14-topeet-u-boot.dtsi
4.3、修改文件 4.3.1、mx6ull_14x14_topeet_emmc_defconfig文件

  1. 第一处（目标板）

    CONFIG_TARGET_MX6ULL_14X14_EVK=y
改为
CONFIG_TARGET_MX6ULL_14X14_TOPEET=y

  2. 第二处（imximage配置文件）

    CONFIG_SYS_EXTRA_OPTIONS="IMX_ConFIG=board/freescale/mx6ullevk/imximage.cfg"
改为
CONFIG_SYS_EXTRA_OPTIONS="IMX_ConFIG=board/freescale/mx6ull_topeet/imximage.cfg"

  3. 第三处（设备树）

    CONFIG_DEFAULT_DEVICE_TREE="imx6ull-14x14-evk-emmc"
改为
CONFIG_DEFAULT_DEVICE_TREE="imx6ull-14x14-topeet-emmc"

  4. 第四处（74lv595相关，自己的开发板没有该芯片）

    CONFIG_DM_74X164=y
改为
# CONFIG_DM_74X164 is not set
    
CONFIG_SOFT_SPI=y
改为
# CONFIG_SOFT_SPI is not set
4.3.2、mx6ull_topeet.h文件修改

添加自己开发板的内容，修改如下：

		"findfdt="
			"if test $fdt_file = undefined; then " 
				"if test $board_name = ULZ-EVK && test $board_rev = 14X14; then " 
					"setenv fdt_file imx6ulz-14x14-evk.dtb; fi; " 
				"if test $board_name = EVK && test $board_rev = 9X9; then " 
					"setenv fdt_file imx6ull-9x9-evk.dtb; fi; " 
				"if test $board_name = EVK && test $board_rev = 14X14; then " 
					"setenv fdt_file imx6ull-14x14-evk.dtb; fi; " 
				"if test $board_name = TOPEET && test $board_rev = 14X14; then " 
					"setenv fdt_file imx6ull-14x14-topeet.dtb; fi; " 
				"if test $fdt_file = undefined; then " 
					"echo WARNING: Could not determine dtb to use; " 
				"fi; " 
			"fi;" 
		"findtee="
			"if test $tee_file = undefined; then " 
				"if test $board_name = ULZ-EVK && test $board_rev = 14X14; then " 
					"setenv tee_file uTee-6ulzevk; fi; " 
				"if test $board_name = EVK && test $board_rev = 9X9; then " 
					"setenv tee_file uTee-6ullevk; fi; " 
				"if test $board_name = EVK && test $board_rev = 14X14; then " 
					"setenv tee_file uTee-6ullevk; fi; " 
				"if test $board_name = TOPEET && test $board_rev = 14X14; then " 
					"setenv tee_file uTee-6ull_topeet; fi; " 
				"if test $tee_file = undefined; then " 
					"echo WARNING: Could not determine tee to use; " 
				"fi; " 
			"fi;"
4.3.3、mx6ull_topeet文件夹

  1. Kconfig文件修改如下（最后endif之后务必添加换行）

    if TARGET_MX6ULL_14X14_TOPEET

config SYS_BOARD
	default "mx6ull_topeet"

config SYS_VENDOR
	default "freescale"

config SYS_CONFIG_NAME
	default "mx6ull_topeet"

config SYS_TEXT_base
	default 0x87800000
endif

  2. Makefile文件修改如下

    obj-y  := mx6ull_topeet.o

  3. 由于CONFIG_USE_IMXIMG_PLUGIN没有使能，所以imximage_lpddr2.cfg文件和和imximage.cfg无需修改。否则改动如下

    PLUGIN	board/freescale/mx6ullevk/plugin.bin 0x00907000
改为
PLUGIN	board/freescale/mx6ull_topeet/plugin.bin 0x00907000

  4. mx6ull_topeet.c文件修改

    1. LCD电源引脚

      static iomux_v3_cfg_t const lcd_pads[] = {
	
	MX6_PAD_GPIO1_IO08__GPIO1_IO08 | MUX_PAD_CTRL(NO_PAD_CTRL),
	
	MX6_PAD_LCD_DATA08__GPIO3_IO13 | MUX_PAD_CTRL(NO_PAD_CTRL),
};

static int setup_lcd(void)
{
	enable_lcdif_clock(LCDIF1_base_ADDR, 1);

	imx_iomux_v3_setup_multiple_pads(lcd_pads, ARRAY_SIZE(lcd_pads));

	
	gpio_request(IMX_GPIO_NR(3, 13), "lcd power");
	gpio_direction_output(IMX_GPIO_NR(3, 13) , 1);

	
	gpio_request(IMX_GPIO_NR(5, 9), "lcd reset");
	gpio_direction_output(IMX_GPIO_NR(5, 9) , 0);
	udelay(500);
	gpio_direction_output(IMX_GPIO_NR(5, 9) , 1);

	
	gpio_request(IMX_GPIO_NR(1, 8), "backlight");
	gpio_direction_output(IMX_GPIO_NR(1, 8) , 1);

	return 0;
}

    2. 输出信息修改

      int board_late_init(void)
{
#ifdef CONFIG_CMD_BMODE
	add_board_boot_modes(board_boot_modes);
#endif

	env_set("tee", "no");
#ifdef CONFIG_IMX_OPTEE
	env_set("tee", "yes");
#endif

#ifdef CONFIG_ENV_VARS_UBOOT_RUNTIME_CONFIG
	env_set("board_name", "TOPEET");

	if (is_mx6ull_9x9_evk())
		env_set("board_rev", "9X9");
	else
		env_set("board_rev", "14X14");

	if (is_cpu_type(MXC_CPU_MX6ULZ)) {
		env_set("board_name", "ULZ-EVK");
		env_set("usb_net_cmd", "usb start");
    }
#endif

	setup_lcd();

#ifdef CONFIG_ENV_IS_IN_MMC
	board_late_mmc_env_init();
#endif

	set_wdog_reset((struct wdog_regs *)WDOG1_base_ADDR);

	return 0;
}


int checkboard(void)
{
	if (is_mx6ull_9x9_evk())
		puts("Board: MX6ULL 9x9 EVKn");
	else if (is_cpu_type(MXC_CPU_MX6ULZ))
		puts("Board: MX6ULZ 14x14 EVKn");
	else
		puts("Board: MX6ULL 14x14 TOPEETn");

	return 0;
}
4.3.4、设备树

  • imx6ull-14x14-topeet.dts文件

    model = "i.MX6 ULL 14x14 EVK Board";
compatible = "fsl,imx6ull-14x14-evk", "fsl,imx6ull";
改为
model = "i.MX6 ULL 14x14 TOPEET Board";
compatible = "fsl,imx6ull-14x14-topeet", "fsl,imx6ull";

  • imx6ul-14x14-topeet.dtsi文件

    1.官方evk开发板使用了一颗扩展IO的芯片74lv595，手上的开发板没有该芯片，所以需要去掉该芯片相关内容。屏蔽或删除以下内容：

    	aliases {
		
	};




&can1 {
	pinctrl-names = "default";
	pinctrl-0 = <&pinctrl_flexcan1>;
	
	status = "okay";
};

&can2 {
	pinctrl-names = "default";
	pinctrl-0 = <&pinctrl_flexcan2>;
	
	status = "okay";
};

  1. LCD修改。手上的开发板使用的是1024x600的rgb液晶屏，主要修改display-timings以及电源引脚

    pinctrl_lcdif_dat修改：

    	pinctrl_lcdif_dat: lcdifdatgrp {
		fsl,pins = <
			
			MX6UL_PAD_LCD_DATA03__LCDIF_DATA03  0x79
			MX6UL_PAD_LCD_DATA04__LCDIF_DATA04  0x79
			MX6UL_PAD_LCD_DATA05__LCDIF_DATA05  0x79
			MX6UL_PAD_LCD_DATA06__LCDIF_DATA06  0x79
			MX6UL_PAD_LCD_DATA07__LCDIF_DATA07  0x79
			
			MX6UL_PAD_LCD_DATA10__LCDIF_DATA10  0x79
			MX6UL_PAD_LCD_DATA11__LCDIF_DATA11  0x79
			MX6UL_PAD_LCD_DATA12__LCDIF_DATA12  0x79
			MX6UL_PAD_LCD_DATA13__LCDIF_DATA13  0x79
			MX6UL_PAD_LCD_DATA14__LCDIF_DATA14  0x79
			MX6UL_PAD_LCD_DATA15__LCDIF_DATA15  0x79
			
			MX6UL_PAD_LCD_DATA19__LCDIF_DATA19  0x79
			MX6UL_PAD_LCD_DATA20__LCDIF_DATA20  0x79
			MX6UL_PAD_LCD_DATA21__LCDIF_DATA21  0x79
			MX6UL_PAD_LCD_DATA22__LCDIF_DATA22  0x79
			MX6UL_PAD_LCD_DATA23__LCDIF_DATA23  0x79
		>;
	};

    pinctrl_lcdif_ctrl修改：

    	pinctrl_lcdif_ctrl: lcdifctrlgrp {
		fsl,pins = <
			MX6UL_PAD_LCD_CLK__LCDIF_CLK	    0x79
			MX6UL_PAD_LCD_ENABLE__LCDIF_ENABLE  0x79
			MX6UL_PAD_LCD_HSYNC__LCDIF_HSYNC    0x79
			MX6UL_PAD_LCD_VSYNC__LCDIF_VSYNC    0x79
			
			MX6UL_PAD_SNVS_TAMPER9__GPIO5_IO09  0x79
			
			MX6UL_PAD_LCD_DATA08__GPIO3_IO13	0x79
		>;
	};

    display-timings修改：

    &lcdif {
	pinctrl-names = "default";
	pinctrl-0 = <&pinctrl_lcdif_dat
		     &pinctrl_lcdif_ctrl>;

	display = <&display0>;
	status = "okay";

	display0: display@0 {
		bits-per-pixel = <24>;
		bus-width = <24>;

		display-timings {
			native-mode = <&timing0>;
			timing0: timing0 {
			clock-frequency = <51200000>;
			hactive = <1024>;
			vactive = <600>;
			hfront-porch = <160>;
			hback-porch = <140>;
			hsync-len = <20>;
			vback-porch = <20>;
			vfront-porch = <12>;
			vsync-len = <3>;

			hsync-active = <0>;
			vsync-active = <0>;
			de-active = <1>;
			pixelclk-active = <0>;
			};
		};
	};
};

    关于display-timings的说明可以参考uboot源码下的该文档：doc/device-tree-bindings/video/display-timing.txt

  2. 网络芯片修改。手上开发板使用的网络芯片与官方板同款KSZ8081，除了复位引脚不同外其他一样，官方开发板是通过74lv595扩展IO控制复位引脚。修改如下：

    &fec2 {
	pinctrl-names = "default";
	pinctrl-0 = <&pinctrl_enet2>;
	phy-mode = "rmii";
	phy-handle = <ðphy1>;
	status = "okay";

	mdio {
		#address-cells = <1>;
		#size-cells = <0>;

		ethphy0: ethernet-phy@2 {
			reg = <2>;
			micrel,led-mode = <1>;
			clocks = <&clks IMX6UL_CLK_ENET_REF>;
			clock-names = "rmii-ref";
			phy-reset-gpios = <&gpio5 7 GPIO_ACTIVE_LOW>;
			phy-reset-duration = <10>;
			phy-reset-post-delay = <10>;
		};

		ethphy1: ethernet-phy@1 {
			reg = <1>;
			micrel,led-mode = <1>;
			clocks = <&clks IMX6UL_CLK_ENET2_REF>;
			clock-names = "rmii-ref";
			phy-reset-gpios = <&gpio5 8 GPIO_ACTIVE_LOW>;
			phy-reset-duration = <10>;
			phy-reset-post-delay = <10>;
		};
	};
};

    phy-reset-gpios、phy-reset-duration、phy-reset-post-delay参数在文件drivers/net/fec_mxc.c中用到。

  3. 修改设备树Makefile文件arch/arm/dts/Makefile，添加自己的开发板。

    dtb-$(CONFIG_MX6ULL) += 
	imx6ull-14x14-ddr3-val.dtb 
	imx6ull-14x14-ddr3-val-epdc.dtb 
	imx6ull-14x14-ddr3-val-emmc.dtb 
	imx6ull-14x14-ddr3-val-gpmi-weim.dtb 
	imx6ull-14x14-ddr3-val-tsc.dtb 
	imx6ull-14x14-evk.dtb 
	imx6ull-14x14-evk-emmc.dtb 
	imx6ull-14x14-topeet-emmc.dtb 
	imx6ull-14x14-evk-gpmi-weim.dtb 
	imx6ull-9x9-evk.dtb 
	imx6ull-colibri.dtb 
	imx6ull-phytec-segin-ff-rdk-emmc.dtb 
	imx6ull-dart-6ul.dtb 
	imx6ull-somlabs-visionsom.dtb 
	imx6ulz-14x14-evk.dtb 
	imx6ulz-14x14-evk-emmc.dtb 
	imx6ulz-14x14-evk-gpmi-weim.dtb
4.3.5、其他修改

arch/arm/mach-imx/mx6/Kconfig文件修改:

添加自己开发板平台

config TARGET_MX6ULL_14X14_TOPEET
	bool "Support mx6ull_14x14_topeet"
	select BOARD_LATE_INIT
	select DM
	select DM_THERMAL
	select MX6ULL
	imply CMD_DM

添加自己的开发板Kconfig文件

source "board/freescale/mx6ull_topeet/Kconfig"
五、编译启动

  1. 修改make.sh文件

    make mx6ull_14x14_evk_emmc_defconfig
改为
make mx6ull_14x14_topeet_emmc_defconfig

    执行./make.sh等待编译完成。

  2. 烧录至SD卡

    sudo dd if=u-boot-dtb.imx of=/dev/sdb bs=1K seek=1 && sync

    编译完成后使用上述命令将uboot固件烧录至SD卡，sdb是我的SD卡挂载到Ubuntu下的名字，可以通过命令ls /dev/sd*查看挂载了哪些设备来确定烧录对象。

  3. 启动开发板

    开发板拨码开关对应启动方式：

    12345678启动设备01------串行下载（USB _OTG烧写镜像）10000010SD 卡启动10100110EMMC 启动10001001NAND FLASH 启动
六、其他 6.1、endif错误 
board/freescale/mx6ull_topeet/Kconfig:14: 'endif' in different file than 'if'
board/freescale/mx6ull_topeet/Kconfig:3: location of the 'if'
arch/arm/mach-imx/mx6/Kconfig:913: 'endif' in different file than 'if'
board/freescale/mx6ull_topeet/Kconfig:3: location of the 'if'
arch/arm/Kconfig:1893: 'endmenu' in different file than 'menu'
board/freescale/mx6ull_topeet/Kconfig:3: location of the 'menu'
make[1]: *** [scripts/kconfig/Makefile:128：mx6ull_14x14_topeet_emmc_defconfig] 错误 1
make: *** [Makefile:539：mx6ull_14x14_topeet_emmc_defconfig] 错误 2
scripts/kconfig/conf  --syncconfig Kconfig
board/freescale/mx6ull_topeet/Kconfig:14: 'endif' in different file than 'if'
board/freescale/mx6ull_topeet/Kconfig:3: location of the 'if'
arch/arm/mach-imx/mx6/Kconfig:913: 'endif' in different file than 'if'
board/freescale/mx6ull_topeet/Kconfig:3: location of the 'if'
arch/arm/Kconfig:1893: 'endmenu' in different file than 'menu'
board/freescale/mx6ull_topeet/Kconfig:3: location of the 'menu'
make[2]: *** [scripts/kconfig/Makefile:47：syncconfig] 错误 1
make[1]: *** [Makefile:539：syncconfig] 错误 2
make: *** 没有规则可制作目标“include/config/auto.conf”，由“include/config/uboot.release” 需求。 停止。

出现该错误的原因是因为我在修改board/freescale/mx6ull_topeet/Kconfig文件时没有在文件最后endif之后添加换行，在该文件最后敲个换行即可解决。

6.2、Net Error错误 
U-Boot 2020.04-00001-g44f5949dd9-dirty (Oct 17 2021 - 19:25:28 +0800)

CPU:   i.MX6ULL rev1.1 792 MHz (running at 396 MHz)
CPU:   Industrial temperature grade (-40C to 105C) at 37C
Reset cause: POR
Model: i.MX6 ULL 14x14 TOPEET Board
Board: MX6ULL 14x14 TOPEET
DRAM:  512 MiB
MMC:   FSL_SDHC: 0, FSL_SDHC: 1
Loading Environment from MMC... *** Warning - bad CRC, using default environment

[*]-Video link 0 (1024 x 600)
        [0] lcdif@21c8000, video
In:    serial
Out:   serial
Err:   serial
switch to partitions #0, OK
mmc0 is current device
flash target is MMC:0
Net:
Error: ethernet@20b4000 address not set.

Error: ethernet@20b4000 address not set.

Error: ethernet@20b4000 address not set.
FEC: can't find phy-handle

Error: ethernet@20b4000 address not set.
Could not get PHY for FEC0: addr 2

Error: ethernet@20b4000 address not set.
FEC: can't find phy-handle

Error: ethernet@20b4000 address not set.
Could not get PHY for FEC0: addr 2
No ethernet found.

若uboot启动后终端输出如上错误信息，有两种解决方案：

方案一：

在文件configs/mx6ull_14x14_topeet_emmc_defconfig添加以下内容使能uboot给网卡分配随机MAC地址的功能，然后重新编译后烧录启动

CONFIG_NET_RANDOM_ETHADDR=y

使能随机分配MAC功能后结果：

U-Boot 2020.04-00001-g44f5949dd9-dirty (Oct 17 2021 - 21:57:35 +0800)

CPU:   i.MX6ULL rev1.1 792 MHz (running at 396 MHz)
CPU:   Industrial temperature grade (-40C to 105C) at 36C
Reset cause: POR
Model: i.MX6 ULL 14x14 TOPEET Board
Board: MX6ULL 14x14 TOPEET
DRAM:  512 MiB
MMC:   FSL_SDHC: 0, FSL_SDHC: 1
Loading Environment from MMC... *** Warning - bad CRC, using default environment

[*]-Video link 0 (1024 x 600)
        [0] lcdif@21c8000, video
In:    serial
Out:   serial
Err:   serial
switch to partitions #0, OK
mmc0 is current device
flash target is MMC:0
Net:
Warning: ethernet@20b4000 (eth1) using random MAC address - 5a:49:f1:d9:07:cd
eth1: ethernet@20b4000 [PRIME]Get shared mii bus on ethernet@2188000

Warning: ethernet@2188000 (eth0) using random MAC address - ca:85:77:84:17:ae
, eth0: ethernet@2188000

方案二：

在终端中使用以下命令设置MAC地址

# 设置网卡1
setenv ethaddr ca:38:29:c3:28:30
# 设置网卡2
setenv eth1addr 76:7d:33:a8:f0:e7
# 保存
saveenv
# 重启
reset

重启后输出结果：

U-Boot 2020.04-00001-g44f5949dd9-dirty (Oct 17 2021 - 22:03:25 +0800)

CPU:   i.MX6ULL rev1.1 792 MHz (running at 396 MHz)
CPU:   Industrial temperature grade (-40C to 105C) at 45C
Reset cause: POR
Model: i.MX6 ULL 14x14 TOPEET Board
Board: MX6ULL 14x14 TOPEET
DRAM:  512 MiB
MMC:   FSL_SDHC: 0, FSL_SDHC: 1
Loading Environment from MMC... OK
[*]-Video link 0 (1024 x 600)
        [0] lcdif@21c8000, video
In:    serial
Out:   serial
Err:   serial
switch to partitions #0, OK
mmc0 is current device
flash target is MMC:0
Net:   eth1: ethernet@20b4000 [PRIME]Get shared mii bus on ethernet@2188000
, eth0: ethernet@2188000

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