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_defconfigCONFIG_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_emmccd 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 <peng.fan@nxp.com> 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\0"
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