根据nxp原厂uboot移植

Posted 2020-11-22 lzd626

1.首先拿到一个原厂uboot，先编译一下；查找根目录下config目录里自己需要的配置文件，通过在根目录新建如下脚本imx_emmc.sh后，执行 ./imx_emmc.sh后完成编译工作

#!/bin/bash
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- -j8

2.把编译得到的uboot.bin烧进板子就可以看到那些部分是支持，那些是不支持的，不支持的就需要我们的移植工作了；既然如此，那就新建一套自己板子的uboot，感受一下一整套流程

2.1：添加配置文件

cd configs

cp mx6ull_14x14_evk_emmc_defconfig mx6ull_alientek_emmc_defconfig

CONFIG_SYS_EXTRA_OPTIONS="IMX_CONFIG=board/freescale/mx6ull_alientek_emmc/imximage.cfg,MX6ULL_EVK_EMMC_REWORK"
CONFIG_ARM=y
CONFIG_ARCH_MX6=y
CONFIG_TARGET_MX6ULL_ALIENTEK_EMMC=y
CONFIG_CMD_GPIO=y

2.2：添加头文件

cd include/configs

cp mx6ullevk.h mx6ull_alientek_emmc.h

记得修改预处理，这个头文件的主要内容就是配置或者裁剪 uboot

 

2.3：添加板级文件夹

cd board/freescale/

cp mx6ullevk/ -r mx6ull_alientek_emmc

cd mx6ull_alientek_emmc
mv mx6ullevk.c mx6ull_alientek_emmc.c

2.3.1：修改Makefile

# (C) Copyright 2015 Freescale Semiconductor, Inc.
#
# SPDX-License-Identifier:	GPL-2.0+
#

obj-y  := mx6ull_alientek_emmc.o

extra-$(CONFIG_USE_PLUGIN) :=  plugin.bin
$(obj)/plugin.bin: $(obj)/plugin.o
	$(OBJCOPY) -O binary --gap-fill 0xff $< $@

2.3.2：修改imximage.cfg

PLUGIN	board/freescale/mx6ull_alientek_emmc/plugin.bin 0x00907000

2.3.3：修改Kconfig

if TARGET_MX6ULL_ALIENTEK_EMMC

config SYS_BOARD
	default "mx6ull_alientek_emmc"

config SYS_VENDOR
	default "freescale"

config SYS_CONFIG_NAME
	default "mx6ull_alientek_emmc"

endif

2.3.4：修改 MAINTAINERS

MX6ULL_ALIENTEK_EMMC BOARD
M:	Peng Fan <[e-mail]>
S:	Maintained
F:	board/freescale/mx6ull_alientek_emmc/
F:	include/configs/mx6ull_alientek_emmc.h

2.4：修改uboot图形界面配置文件：arch/arm/cpu/armv7/mx6/Kconfig

config TARGET_MX6ULL_ALIENTEK_EMMC
	bool "Support mx6ull_alientek_emmc"
	select MX6ULL
	select DM
	select DM_THERMAL

。。。。

source "board/freescale/mx6ull_alientek_emmc/Kconfig"

2.5：新建脚本编译新建的uboot

#!/bin/bash
make ARCH=arm CROSS_COMPILE=arm-linux-gnueabihf- distclean
make ARCH=arm CROSS_COMPILE=arm-linux-gnueabihf- mx6ull_alientek_emmc_defconfig
make V=1 ARCH=arm CROSS_COMPILE=arm-linux-gnueabihf- -j8

2.6：修改lcd驱动，（1）检查gpio引脚；（2）检查lcd信息结构体参数（lcd控制器需要设置的参数）

2.6.1：一般驱动的配置都在xxx.h与.c文件中，在mx6ull_alientek_emmc.c中修改如下

struct display_info_t const displays[] = {{
	.bus = MX6UL_LCDIF1_BASE_ADDR,
	.addr = 0,
	.pixfmt = 24,
	.detect = NULL,
	.enable	= do_enable_parallel_lcd,
	.mode	= {
		.name			= "TFT7016",
		.xres           = 480,
		.yres           = 272,
		.pixclock       = 19531,
		.left_margin    = 140,
		.right_margin   = 160,
		.upper_margin   = 20,
		.lower_margin   = 12,
		.hsync_len      = 20,
		.vsync_len      = 3,
		.sync           = 0,
		.vmode          = FB_VMODE_NONINTERLACED
} } };

2.6.2：在mx6ull_alientek_emmc.h文件中修改如下：

"panel=TFT7016"

2.7：网络驱动修改，看原理图可知，网络信号通过以太网接口，传给phy芯片处理后，再交给ENET1/2控制器处理；imx的ENET_MDIO通过不同的器件地址来访问某个phy芯片；开发板 ENET1 上连接的LAN8720A器件地址为 0X0，所示我们要修改 ENET1 网络驱动；（1）ENET1 复位引脚初始化。（2）LAN8720A 的器件 ID。（3）LAN8720 驱动。      ENET2同理

2.7.1：在mx6ull_alientek_emmc.c中修改地址

#define CONFIG_CMD_NET
#ifdef CONFIG_CMD_NET
#define CONFIG_CMD_PING
#define CONFIG_CMD_DHCP
#define CONFIG_CMD_MII
#define CONFIG_FEC_MXC
#define CONFIG_MII
#define CONFIG_FEC_ENET_DEV		1

#if (CONFIG_FEC_ENET_DEV == 0)
#define IMX_FEC_BASE			ENET_BASE_ADDR
#define CONFIG_FEC_MXC_PHYADDR          0x1
#define CONFIG_FEC_XCV_TYPE             RMII
#elif (CONFIG_FEC_ENET_DEV == 1)
#define IMX_FEC_BASE			ENET2_BASE_ADDR
#define CONFIG_FEC_MXC_PHYADDR		0x0
#define CONFIG_FEC_XCV_TYPE		RMII
#endif
#define CONFIG_ETHPRIME			"FEC"

#define CONFIG_PHYLIB
#define CONFIG_PHY_SMSC  //产品公司名称
#endif

2.7.2：在mx6ull_alientek_emmc.c中删除掉74LV595 的驱动代码；复位引脚修增加如下

#define ENET1_RESET IMX_GPIO_NR(5, 7)
#define ENET2_RESET IMX_GPIO_NR(5, 8)

2.7.3：在mx6ull_alientek_emmc.c中添加复位引脚驱动

static iomux_v3_cfg_t const fec1_pads[] = {
	MX6_PAD_GPIO1_IO06__ENET1_MDIO | MUX_PAD_CTRL(MDIO_PAD_CTRL),
	MX6_PAD_GPIO1_IO07__ENET1_MDC | MUX_PAD_CTRL(ENET_PAD_CTRL),
	MX6_PAD_ENET1_TX_DATA0__ENET1_TDATA00 | MUX_PAD_CTRL(ENET_PAD_CTRL),
	MX6_PAD_ENET1_TX_DATA1__ENET1_TDATA01 | MUX_PAD_CTRL(ENET_PAD_CTRL),
	MX6_PAD_ENET1_TX_EN__ENET1_TX_EN | MUX_PAD_CTRL(ENET_PAD_CTRL),
	MX6_PAD_ENET1_TX_CLK__ENET1_REF_CLK1 | MUX_PAD_CTRL(ENET_CLK_PAD_CTRL),
	MX6_PAD_ENET1_RX_DATA0__ENET1_RDATA00 | MUX_PAD_CTRL(ENET_PAD_CTRL),
	MX6_PAD_ENET1_RX_DATA1__ENET1_RDATA01 | MUX_PAD_CTRL(ENET_PAD_CTRL),
	MX6_PAD_ENET1_RX_ER__ENET1_RX_ER | MUX_PAD_CTRL(ENET_PAD_CTRL),
	MX6_PAD_ENET1_RX_EN__ENET1_RX_EN | MUX_PAD_CTRL(ENET_PAD_CTRL),
	MX6_PAD_SNVS_TAMPER7__GPIO5_IO07 | MUX_PAD_CTRL(NO_PAD_CTRL),
};

static iomux_v3_cfg_t const fec2_pads[] = {
	MX6_PAD_GPIO1_IO06__ENET2_MDIO | MUX_PAD_CTRL(MDIO_PAD_CTRL),
	MX6_PAD_GPIO1_IO07__ENET2_MDC | MUX_PAD_CTRL(ENET_PAD_CTRL),

	MX6_PAD_ENET2_TX_DATA0__ENET2_TDATA00 | MUX_PAD_CTRL(ENET_PAD_CTRL),
	MX6_PAD_ENET2_TX_DATA1__ENET2_TDATA01 | MUX_PAD_CTRL(ENET_PAD_CTRL),
	MX6_PAD_ENET2_TX_CLK__ENET2_REF_CLK2 | MUX_PAD_CTRL(ENET_CLK_PAD_CTRL),
	MX6_PAD_ENET2_TX_EN__ENET2_TX_EN | MUX_PAD_CTRL(ENET_PAD_CTRL),

	MX6_PAD_ENET2_RX_DATA0__ENET2_RDATA00 | MUX_PAD_CTRL(ENET_PAD_CTRL),
	MX6_PAD_ENET2_RX_DATA1__ENET2_RDATA01 | MUX_PAD_CTRL(ENET_PAD_CTRL),
	MX6_PAD_ENET2_RX_EN__ENET2_RX_EN | MUX_PAD_CTRL(ENET_PAD_CTRL),
	MX6_PAD_ENET2_RX_ER__ENET2_RX_ER | MUX_PAD_CTRL(ENET_PAD_CTRL),
	MX6_PAD_SNVS_TAMPER8__GPIO5_IO08 | MUX_PAD_CTRL(NO_PAD_CTRL),
};

static void setup_iomux_fec(int fec_id)
{
	if (fec_id == 0)
	{
		imx_iomux_v3_setup_multiple_pads(fec1_pads,
						 ARRAY_SIZE(fec1_pads));
		gpio_direction_output(ENET1_RESET, 1);
		gpio_set_value(ENET1_RESET, 0);
		mdelay(20);
		gpio_set_value(ENET1_RESET, 1);
	}
	else
	{
		imx_iomux_v3_setup_multiple_pads(fec2_pads,
						 ARRAY_SIZE(fec2_pads));
		gpio_direction_output(ENET2_RESET, 1);
		gpio_set_value(ENET2_RESET, 0);
		mdelay(20);
		gpio_set_value(ENET2_RESET, 1);
	}
}

2.7.4：修改 drivers/net/phy/phy.c 文件中的函数 genphy_update_link，添加如下代码段

	#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