[IMX6ULL]移植lf-v2022.04 U-boot

移植lf-v2022.04 U-boot

文章目录

移植lf-v2022.04 U-boot
- 1 下载 NXP uboot
- 2 编译 NXP uboot
- - 2.1 编译命令
  - 2.2 编译错误
- 3 烧写NXP uboot
- 4 适配正点原子alpha板子
- - 4.1 添加配置文件
  - 4.2 添加设备树文件
  - - 4.2.1 添加板级设备树文件
    - 4.2.2 根据板子原理图裁剪和修改设备树内容
  - 4.3 将alpha开发板添加进编译uboot的编译选项（menuconfig）
  - 4.4 编译alpha-uboot
  - 4.5 添加网卡支持
  - 4.6 添加alpha7寸屏幕支持
  - 4.7 测试引导Linux内核

1 下载 NXP uboot

git clone https://github.com/nxp-imx/uboot-imx.git
git checkout lf_v2022.04

GitHub 地址:nxp-imx/uboot-imx

2 编译 NXP uboot

2.1 编译命令

make ARCH=arm CROSS_COMPILE=arm-linux-gnueabihf- distclean
make ARCH=arm CROSS_COMPILE=arm-linux-gnueabihf- mx6ull_14x14_evk_emmc_defconfig
make V=1 ARCH=arm CROSS_COMPILE=arm-linux-gnueabihf- -j16

2.2 编译错误

bison: not found

  HOSTCC  scripts/basic/fixdep
  HOSTCC  scripts/kconfig/conf.o
  YACC    scripts/kconfig/zconf.tab.c
/bin/sh: 1: bison: not found
make[1]: *** [scripts/Makefile.lib:224：scripts/kconfig/zconf.tab.c] 错误 127
make: *** [Makefile:574：mx6ull_14x14_evk_emmc_defconfig] 错误 2

解决方法：

sudo apt-get install bison -y

flex: not found

  YACC    scripts/kconfig/zconf.tab.c
  LEX     scripts/kconfig/zconf.lex.c
/bin/sh: 1: flex: not found
make[1]: *** [scripts/Makefile.lib:216：scripts/kconfig/zconf.lex.c] 错误 127
make: *** [Makefile:574：mx6ull_14x14_evk_emmc_defconfig] 错误 2

解决方法：

sudo apt-get install flex -y

Your GCC is older than 6.0 and is not supported

*** Your GCC is older than 6.0 and is not supported
make: *** [arch/arm/config.mk:74：checkgcc6] 错误 1

解决方法：

安装版本更新的arm-linux-gnueabihf , 安装步骤参考正点原子文档4.3章节。

3 烧写NXP uboot

./tools/imxdownload u-boot.bin /dev/sdb

记得选择SD启动

4 适配正点原子alpha板子

4.1 添加配置文件

板级defconfig文件

cp configs/mx6ull_14x14_evk_emmc_defconfig configs/mx6ull_14x14_alpha_emmc_defconfig

修改内容为:

# 将下面config修改为
CONFIG_TARGET_MX6ULL_14X14_ALPHA=y
CONFIG_DEFAULT_DEVICE_TREE="imx6ull-14x14-alpha-emmc"

板级头文件

cp ./include/configs/mx6ullevk.h ./include/configs/mx6ullalpha.h

修改内容为:

// 修改点1：修改头文件标识
#ifndef __MX6ULLALPHA_CONFIG_H
#define __MX6ULLALPHA_CONFIG_H


//修改点2：根据board_name和board_rev选择alpha的dtb文件

		"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 = ALPHA && test $board_rev = 14X14; then " \
					"setenv fdt_file imx6ull-14x14-alpha-emmc.dtb; fi; " \				
				"if test $fdt_file = undefined; then " \
					"echo WARNING: Could not determine dtb to use; " \
				"fi; " \
			"fi;\0" \

cp -r ./board/freescale/mx6ullevk ./board/freescale/mx6ullalpha
cd ./board/freescale/mx6ullalpha
mv mx6ullevk.c mx6ullalpha.c

修改mx6ullalpha.c

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

	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

int checkboard(void)
{
	if (is_mx6ull_9x9_evk())
		puts("Board: MX6ULL 9x9 EVK\n");
	else if (is_cpu_type(MXC_CPU_MX6ULZ))
		puts("Board: MX6ULZ 14x14 EVK\n");
	else
		puts("Board: MX6ULL 14x14 ALPHA\n"); //uboot的打印信息

	return 0;
}

修改imximage.cfg

#ifdef CONFIG_USE_IMXIMG_PLUGIN
/*PLUGIN    plugin-binary-file    IRAM_FREE_START_ADDR*/
PLUGIN	board/freescale/mx6ullalpha/plugin.bin 0x00907000
#else

修改Kconfig

if TARGET_MX6ULL_14X14_ALPHA

config SYS_BOARD
	default "mx6ullalpha"

config SYS_VENDOR
	default "freescale"

config SYS_CONFIG_NAME
	default "mx6ullalpha"

config IMX_CONFIG
	default "board/freescale/mx6ullalpha/imximage.cfg"

config SYS_TEXT_BASE
	default 0x87800000
endif

修改MAINTAINERS

MX6ULLALPHA BOARD
M:	Peng Fan <peng.fan@nxp.com>
S:	Maintained
F:	board/freescale/mx6ullalpha/
F:	include/configs/mx6ullalpha.h
F:	configs/mx6ull_14x14_alpha_emmc_defconfig

修改Makefile

obj-y  := mx6ullalpha.o

4.2 添加设备树文件

4.2.1 添加板级设备树文件

cp ./arch/arm/dts/imx6ull-14x14-evk-emmc.dts ./arch/arm/dts/imx6ull-14x14-alpha-emmc.dts
cp ./arch/arm/dts/imx6ull-14x14-evk.dts ./arch/arm/dts/imx6ull-14x14-alpha.dts
cp ./arch/arm/dts/imx6ul-14x14-evk.dtsi ./arch/arm/dts/imx6ul-14x14-alpha.dtsi
cp ./arch/arm/dts/imx6ul-14x14-evk-u-boot.dtsi ./arch/arm/dts/imx6ul-14x14-alpha-u-boot.dtsi

修改imx6ull-14x14-alpha-emmc.dts

#include "imx6ull-14x14-alpha.dts"

&usdhc2 {
	pinctrl-names = "default", "state_100mhz", "state_200mhz";
	pinctrl-0 = <&pinctrl_usdhc2_8bit>;
	pinctrl-1 = <&pinctrl_usdhc2_8bit_100mhz>;
	pinctrl-2 = <&pinctrl_usdhc2_8bit_200mhz>;
	bus-width = <8>;
	non-removable;
	status = "okay";
};

修改imx6ull-14x14-alpha.dts

#include "imx6ull.dtsi"
#include "imx6ul-14x14-alpha.dtsi"
#include "imx6ul-14x14-alpha-u-boot.dtsi"

/ {
	model = "i.MX6 ULL 14x14 ALPHA Board";
	compatible = "fsl,imx6ull-14x14-alpha", "fsl,imx6ull";
};

修改arch/arm/dts/Makefile, 添加alpha板子

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-alpha-emmc.dtb \
	imx6ull-14x14-evk-gpmi-weim.dtb \
	imx6ull-9x9-evk.dtb \
	imx6ull-colibri.dtb \
	imx6ull-colibri-emmc.dtb \
	imx6ull-myir-mys-6ulx-eval.dtb \
	imx6ull-seeed-npi-imx6ull-dev-board.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

4.2.2 根据板子原理图裁剪和修改设备树内容

4.3 将alpha开发板添加进编译uboot的编译选项（menuconfig）

修改arch/arm/mach-imx/mx6/Kconfig

config TARGET_MX6ULL_14X14_ALPHA
	bool "Support mx6ull_14x14_alpha"
	depends on MX6ULL
	select BOARD_LATE_INIT
	select DM
	select DM_THERMAL
	select IMX_MODULE_FUSE
	select OF_SYSTEM_SETUP
	imply CMD_DM

source "board/freescale/mx6ullalpha/Kconfig"

4.4 编译alpha-uboot

make ARCH=arm CROSS_COMPILE=arm-linux-gnueabihf- distclean
make ARCH=arm CROSS_COMPILE=arm-linux-gnueabihf- mx6ull_14x14_alpha_emmc_defconfig
make V=1 ARCH=arm CROSS_COMPILE=arm-linux-gnueabihf- -j16

烧录

./tools/imxdownload u-boot-dtb.imx /dev/sdb
或者
sudo dd if=u-boot-dtb.imx of=/dev/sdb bs=1k seek=1 conv=fsync

4.5 添加网卡支持

修改imx6ul-14x14-alpha.dtsi

向追加iomuxc_snvs两个phy的RST引脚定义
分别修改fec1、fec2的复位引脚初始化电平以及持续时间
修改ethphy的地址

    &fec2 {
        pinctrl-names = "default";
        pinctrl-0 = <&pinctrl_enet2 &pinctrl_eth2rst>;
        phy-mode = "rmii";
        phy-handle = <&ethphy1>;
        phy-reset-gpios = <&gpio5 8 GPIO_ACTIVE_LOW>;
        phy-reset-duration = <100>;
        status = "okay";

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

            ethphy1: ethernet-phy@1 {
                reg = <1>;
                micrel,led-mode = <1>;
                clocks = <&clks IMX6UL_CLK_ENET2_REF>;
                clock-names = "rmii-ref";
            };
        };
    };

...
	spi4 {
		compatible = "spi-gpio";
		pinctrl-names = "default";
		pinctrl-0 = <&pinctrl_spi4>;
		status = "disable";
		pinctrl-assert-gpios = <&gpio5 8 GPIO_ACTIVE_LOW>;
		gpio-sck = <&gpio5 11 0>;
		gpio-mosi = <&gpio5 10 0>;
		cs-gpios = <&gpio5 7 0>;
		num-chipselects = <1>;
		#address-cells = <1>;
		#size-cells = <0>;

		gpio_spi: gpio@0 {
			compatible = "fairchild,74hc595";
			gpio-controller;
			#gpio-cells = <2>;
			reg = <0>;
			registers-number = <1>;
			registers-default = /bits/ 8 <0x57>;
			spi-max-frequency = <100000>;
		};
	};

修改drivers/net/phy/phy.c

int genphy_update_link(struct phy_device *phydev)
{
	unsigned int mii_reg;

#ifdef CONFIG_PHY_SMSC
	static int lan8720_flag = 0;
	int bmcr_reg = 0;
	if (lan8720_flag == 0)
	{
		bmcr_reg = phy_read(phydev, MDIO_DEVAD_NONE, MII_BMCR);
		phy_write(phydev, MDIO_DEVAD_NONE, MII_BMCR, BMCR_RESET);
		while(phy_read(phydev, MDIO_DEVAD_NONE, MII_BMCR) & 0X8000)
		{
			udelay(100);
		}

		phy_write(phydev, MDIO_DEVAD_NONE, MII_BMCR, bmcr_reg);
		lan8720_flag = 1;
	}
#endif
...
}

修改mx6ull_14x14_alpha_emmc_defconfig

CONFIG_PHYLIB=y
CONFIG_PHY_SMSC=y
CONFIG_NET_RANDOM_ETHADDR=y
#CONFIG_PHY_MICREL=y
#CONFIG_PHY_MICREL_KSZ8XXX=y

测试:

setenv eth1addr 32:34:46:78:9A:DD
setenv serverip 192.168.3.7
setenv ipaddr 192.168.3.34
setenv gatewayip 192.168.3.1
setenv netmask 255.255.255.0
saveenv

tip: u-boot的环境变量是设置在MMC中的，不会随着UBoot重新编译而清除，如果修改乱了可以使用如下命令恢复默认:

(或者格式化mmc设备)

env default -a // 恢复默认设置

saveenv // 将改变覆盖到MMC

4.6 添加alpha7寸屏幕支持

修改设备树arch/arm/dts/imx6ul-14x14-alpha.dtsi

将ALPHA 板子的7寸1024x600的屏幕参数替换到lcdif节点

&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>;
			};
		};
	};
};

ALPHA 开发板上的 LCD 接口用了三个 SGM3157 模拟开关，为了防止模拟开关影响到网络，因此这里需要降低 LCD 数据线的驱动能力, 将0x79改为0x49

	pinctrl_lcdif_dat: lcdifdatgrp {
		fsl,pins = <
			MX6UL_PAD_LCD_DATA00__LCDIF_DATA00  0x49
			MX6UL_PAD_LCD_DATA01__LCDIF_DATA01  0x49
			MX6UL_PAD_LCD_DATA02__LCDIF_DATA02  0x49
			MX6UL_PAD_LCD_DATA03__LCDIF_DATA03  0x49
			MX6UL_PAD_LCD_DATA04__LCDIF_DATA04  0x49
			MX6UL_PAD_LCD_DATA05__LCDIF_DATA05  0x49
			MX6UL_PAD_LCD_DATA06__LCDIF_DATA06  0x49
			MX6UL_PAD_LCD_DATA07__LCDIF_DATA07  0x49
			MX6UL_PAD_LCD_DATA08__LCDIF_DATA08  0x49
			MX6UL_PAD_LCD_DATA09__LCDIF_DATA09  0x49
			MX6UL_PAD_LCD_DATA10__LCDIF_DATA10  0x49
			MX6UL_PAD_LCD_DATA11__LCDIF_DATA11  0x49
			MX6UL_PAD_LCD_DATA12__LCDIF_DATA12  0x49
			MX6UL_PAD_LCD_DATA13__LCDIF_DATA13  0x49
			MX6UL_PAD_LCD_DATA14__LCDIF_DATA14  0x49
			MX6UL_PAD_LCD_DATA15__LCDIF_DATA15  0x49
			MX6UL_PAD_LCD_DATA16__LCDIF_DATA16  0x49
			MX6UL_PAD_LCD_DATA17__LCDIF_DATA17  0x49
			MX6UL_PAD_LCD_DATA18__LCDIF_DATA18  0x49
			MX6UL_PAD_LCD_DATA19__LCDIF_DATA19  0x49
			MX6UL_PAD_LCD_DATA20__LCDIF_DATA20  0x49
			MX6UL_PAD_LCD_DATA21__LCDIF_DATA21  0x49
			MX6UL_PAD_LCD_DATA22__LCDIF_DATA22  0x49
			MX6UL_PAD_LCD_DATA23__LCDIF_DATA23  0x49
		>;
	};

ALPHA 板子不同于NXP的EVK开发板，它的LCD RESET使用的是硬件上电复位，所以不需要使用软件复位，即不需要单独的Pin去reset，所以注释EVK用到的lcd reset, 节约引脚（软件上，在LCD时序也需要注释掉它调用reset脚的时序点，在下面有讲到）

	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
			/*alpha board use hardware reset, so do not need software reset*/
			/* used for lcd reset */
			/*MX6UL_PAD_SNVS_TAMPER9__GPIO5_IO09  0x79*/
		>;
	};

修改board/freescale/mx6ullalpha/mx6ullalpha.c

软件上，在LCD时序也需要注释掉它调用reset脚的时序点

static int setup_lcd(void)
{
	enable_lcdif_clock(LCDIF1_BASE_ADDR, 1);

	imx_iomux_v3_setup_multiple_pads(lcd_pads, ARRAY_SIZE(lcd_pads));

	/*alpha board use hardware reset, so do not need software reset*/
	/* Reset the LCD */
	// 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);

	/* Set Brightness to high */
	gpio_request(IMX_GPIO_NR(1, 8), "backlight");
	gpio_direction_output(IMX_GPIO_NR(1, 8) , 1);

	return 0;
}
#else
static inline int setup_lcd(void) { return 0; }
#endif