Alpha开发板移植uboot

使用2020年的原厂uboot源码来适配开发板

1、网站

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

2、正常编译烧进去

make ARCH=arm CROSS_COMPILE = arm-linux-gnueabihf- mx6ull_14x14_evk_emmc_defconfig
make ARCH=arm CROSS_COMPILE = arm-linux-gnueabihf- -j8

• 串口正常
• LCD能启动但不正常　
• 网络不正常　

3、LCD修改

修改设备树文件： imx6ull-14x14-evk-emmc.dts　 　
添加内容：

&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 = <31000000>;
			hactive = <800>;
			vactive = <480>;
			hfront-porch = <40>;
			hback-porch = <88>;
			hsync-len = <48>;
			vback-porch = <32>;
			vfront-porch = <13>;
			vsync-len = <3>;

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

其中，里面各个参数配置，需根据自己使用的LCD显示屏进行修改。

4、网络修改

修改文件： uboot_freescale_2020_ver/board/freescale/mx6ullevk/mx6ullevk.c　

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

static iomux_v3_cfg_t const fec1_pads[] = {
    
    
	MX6_PAD_SNVS_TAMPER7__GPIO5_IO07 | MUX_PAD_CTRL(NO_PAD_CTRL),
};

static iomux_v3_cfg_t const fec2_pads[] = {
    
    
	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);
	}
		
}

int board_early_init_f(void)
{
    
    
	setup_iomux_uart();

	setup_iomux_fec(1);

	return 0;
}

修改文件： uboot_freescale_2020_ver/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

	/*
	 * Wait if the link is up, and autonegotiation is in progress
	 * (ie - we're capable and it's not done)
	 */
	mii_reg = phy_read(phydev, MDIO_DEVAD_NONE, MII_BMSR);

	/*
	 * If we already saw the link up, and it hasn't gone down, then
	 * we don't need to wait for autoneg again
	 */
	if (phydev->link && mii_reg & BMSR_LSTATUS)
		return 0;

	if ((phydev->autoneg == AUTONEG_ENABLE) &&
	    !(mii_reg & BMSR_ANEGCOMPLETE)) {
    
    
		int i = 0;

		printf("%s Waiting for PHY auto negotiation to complete",
		       phydev->dev->name);
		while (!(mii_reg & BMSR_ANEGCOMPLETE)) {
    
    
			/*
			 * Timeout reached ?
			 */
			if (i > (PHY_ANEG_TIMEOUT / 50)) {
    
    
				printf(" TIMEOUT !\n");
				phydev->link = 0;
				return -ETIMEDOUT;
			}

			if (ctrlc()) {
    
    
				puts("user interrupt!\n");
				phydev->link = 0;
				return -EINTR;
			}

			if ((i++ % 10) == 0)
				printf(".");

			mii_reg = phy_read(phydev, MDIO_DEVAD_NONE, MII_BMSR);
			mdelay(50);	/* 50 ms */
		}
		printf(" done\n");
		phydev->link = 1;
	} else {
    
    
		/* Read the link a second time to clear the latched state */
		mii_reg = phy_read(phydev, MDIO_DEVAD_NONE, MII_BMSR);

		if (mii_reg & BMSR_LSTATUS)
			phydev->link = 1;
		else
			phydev->link = 0;
	}

	return 0;
}

5、改完之后，编译，烧录

一切OK，拜拜。

可自行下载更改后的代码：