IM6Q yocto平臺　uboot v2014.04_3.14.28_1.0.0_ga編譯和調試

針對已搭建好的 IM6Q yocto平臺進行uboot編譯，我買的開發板是天嵌的Ｅ９開發板，不是爲了做廣告，主要是比較下，感覺這個開發板還比較便宜，而且發現別人寫的博客，參考地址：http://blog.csdn.net/girlkoo?viewmode=contents，我的移植也是參考這個地址，我先按照這位博主移植了uboot-v2013.04_3.10.17_ga，然後，按照官方手冊和之前的移植經驗，進行uboot v2014.04_3.14.28_1.0.0_ga移植．

我的資源地址imx6q 針對E9平臺移植資料

下載uboot也可以通過：git clone git://git.freescale.com/imx/uboot-imx.git　直接下載

下面開始uboot的移植了:

(1)進入源碼目錄

進入你搭建好的yocto平臺，然後進入build-x11/tmp/work/imx6qsabresd-poky-linux-gnueabi/u-boot-imx/2014.04-r0/git，這是我的路徑，你的可能會稍有不同，可以找到．

(2)查看並創建自己的分支

git branch -a

git checkout -b imx6q_v2014.04_3.14.28_1.0.0_ga remotes/origin/imx_v2014.04_3.14.28_1.0.0_ga

我的分支名稱叫：imx6q_v2014.04_3.14.28_1.0.0_ga，使用遠程庫：remotes/origin/imx_v2014.04_3.14.28_1.0.0_ga

這個版本與freescale 官方提供版本移植

(2)針對開發板進行移植

①查找參考平臺

你可以像手冊一樣重新定義自己的平臺的名稱，我就偷個懶直接使用源碼中的例程了．我的平臺使用

參考uboot根目錄下的boards.cfg文件，查找你參考的平臺

我使用的平臺：mx6qsabresd

②定製DDR配置

參數如下，至於解釋參考：http://blog.csdn.net/girlkoo/article/details/45420977

進入/board/freescale/imx/ddr修改mx6q_4x_mt41j128.cfg，我的全部代碼如下：

/*
 * Copyright (C) 2011-2014 Freescale Semiconductor, Inc.
 * Jason Liu <[email protected]>
 *
 * SPDX-License-Identifier:    GPL-2.0+
 *
 * Refer doc/README.imximage for more details about how-to configure
 * and create imximage boot image
 *
 * The syntax is taken as close as possible with the kwbimage
 */

#define __ASSEMBLY__
#include <config.h>
/* image version */
IMAGE_VERSION 2

/*
 * Boot Device : one of spi, sd, sata
 * the board has no nand and eimnor
 * spinor: flash_offset: 0x0400
 * sata:   flash_offset: 0x0400
 * sd/mmc: flash_offset: 0x0400
 */

/* the same flash_offset as sd */
BOOT_FROM      sd

#ifdef CONFIG_USE_PLUGIN
/*PLUGIN    plugin-binary-file    IRAM_FREE_START_ADDR*/
PLUGIN    board/freescale/mx6sabresd/plugin.bin 0x00907000
#else

#ifdef CONFIG_SECURE_BOOT
CSF 0x2000
#endif

/*
 * Device Configuration Data (DCD)
 *
 * Each entry must have the format:
 * Addr-type           Address        Value
 *
 * where:
 *      Addr-type register length (1,2 or 4 bytes)
 *      Address   absolute address of the register
 *      value     value to be stored in the register
 */
DATA 4, 0x020e0798, 0x000C0000
DATA 4, 0x020e0758, 0x00000000
DATA 4, 0x020e0588, 0x00000030
DATA 4, 0x020e0594, 0x00000030
DATA 4, 0x020e056c, 0x00000030
DATA 4, 0x020e0578, 0x00000030
DATA 4, 0x020e074c, 0x00000030
DATA 4, 0x020e057c, 0x00000030
DATA 4, 0x020e058c, 0x00000000
DATA 4, 0x020e059c, 0x00000030
DATA 4, 0x020e05a0, 0x00000030
DATA 4, 0x020e078c, 0x00000030
DATA 4, 0x020e0750, 0x00020000
DATA 4, 0x020e05a8, 0x00000018
DATA 4, 0x020e05b0, 0x00000018
DATA 4, 0x020e0524, 0x00000018
DATA 4, 0x020e051c, 0x00000018
DATA 4, 0x020e0518, 0x00000018
DATA 4, 0x020e050c, 0x00000018
DATA 4, 0x020e05b8, 0x00000018
DATA 4, 0x020e05c0, 0x00000018
DATA 4, 0x020e0774, 0x00020000
DATA 4, 0x020e0784, 0x00000018
DATA 4, 0x020e0788, 0x00000018
DATA 4, 0x020e0794, 0x00000018
DATA 4, 0x020e079c, 0x00000018
DATA 4, 0x020e07a0, 0x00000018
DATA 4, 0x020e07a4, 0x00000018
DATA 4, 0x020e07a8, 0x00000018
DATA 4, 0x020e0748, 0x00000018
DATA 4, 0x020e05ac, 0x00000018
DATA 4, 0x020e05b4, 0x00000018
DATA 4, 0x020e0528, 0x00000018
DATA 4, 0x020e0520, 0x00000018
DATA 4, 0x020e0514, 0x00000018
DATA 4, 0x020e0510, 0x00000018
DATA 4, 0x020e05bc, 0x00000018
DATA 4, 0x020e05c4, 0x00000018
DATA 4, 0x021b0800, 0xa1390003
DATA 4, 0x021b080c, 0x001F001F
DATA 4, 0x021b0810, 0x001F001F
DATA 4, 0x021b480c, 0x001F001F
DATA 4, 0x021b4810, 0x001F001F
DATA 4, 0x021b083c, 0x43270338
DATA 4, 0x021b0840, 0x03200314
DATA 4, 0x021b483c, 0x431A032F
DATA 4, 0x021b4840, 0x03200263
DATA 4, 0x021b0848, 0x4B434748
DATA 4, 0x021b4848, 0x4445404C
DATA 4, 0x021b0850, 0x38444542
DATA 4, 0x021b4850, 0x4935493A
DATA 4, 0x021b081c, 0x33333333
DATA 4, 0x021b0820, 0x33333333
DATA 4, 0x021b0824, 0x33333333
DATA 4, 0x021b0828, 0x33333333
DATA 4, 0x021b481c, 0x33333333
DATA 4, 0x021b4820, 0x33333333
DATA 4, 0x021b4824, 0x33333333
DATA 4, 0x021b4828, 0x33333333
DATA 4, 0x021b08b8, 0x00000800
DATA 4, 0x021b48b8, 0x00000800
DATA 4, 0x021b0004, 0x00020036
DATA 4, 0x021b0008, 0x09444040
DATA 4, 0x021b000c, 0x8A8F7955
DATA 4, 0x021b0010, 0xFF328F64
DATA 4, 0x021b0014, 0x01FF00DB
DATA 4, 0x021b0018, 0x00001740
DATA 4, 0x021b001c, 0x00008000
DATA 4, 0x021b002c, 0x000026d2
DATA 4, 0x021b0030, 0x008F1023
DATA 4, 0x021b0040, 0x00000047
DATA 4, 0x021b0000, 0x841A0000
DATA 4, 0x021b001c, 0x04088032
DATA 4, 0x021b001c, 0x00008033
DATA 4, 0x021b001c, 0x00048031
DATA 4, 0x021b001c, 0x09408030
DATA 4, 0x021b001c, 0x04008040
DATA 4, 0x021b0020, 0x00005800
DATA 4, 0x021b0818, 0x00011117
DATA 4, 0x021b4818, 0x00011117
DATA 4, 0x021b0004, 0x00025576
DATA 4, 0x021b0404, 0x00011006
DATA 4, 0x021b001c, 0x00000000

/* set the default clock gate to save power */
DATA 4, 0x020c4068, 0x00C03F3F
DATA 4, 0x020c406c, 0x0030FC03
DATA 4, 0x020c4070, 0x0FFFC000
DATA 4, 0x020c4074, 0x3FF00000
DATA 4, 0x020c4078, 0x00FFF300
DATA 4, 0x020c407c, 0x0F0000F3
DATA 4, 0x020c4080, 0x000003FF

/* enable AXI cache for VDOA/VPU/IPU */
DATA 4, 0x020e0010, 0xF00000CF
/* set IPU AXI-id0 Qos=0xf(bypass) AXI-id1 Qos=0x7 */
DATA 4, 0x020e0018, 0x007F007F
DATA 4, 0x020e001c, 0x007F007F
/*
 * Setup CCM_CCOSR register as follows:
 *
 * cko1_en  = 1       --> CKO1 enabled
 * cko1_div = 111  --> divide by 8
 * cko1_sel = 1011 --> ahb_clk_root
 *
 * This sets CKO1 at ahb_clk_root/8 = 132/8 = 16.5 MHz
 */
DATA 4, 0x020c4060, 0x000000fb
#endif

③修改控制檯輸出

E9開發板使用uart1作爲輸出

進入目錄：build-x11/tmp/work/imx6qsabresd-poky-linux-gnueabi/u-boot-imx/2014.04-r0/git/board/freescale/mx6sabresd

修改mx6sabresd.c文件，共４處

第１處，uart1引腳配置

iomux_v3_cfg_t const uart1_pads[] = {
        //MX6_PAD_CSI0_DAT10__UART1_TX_DATA | MUX_PAD_CTRL(UART_PAD_CTRL),
        //MX6_PAD_CSI0_DAT11__UART1_RX_DATA | MUX_PAD_CTRL(UART_PAD_CTRL),
        MX6_PAD_SD3_DAT6__UART1_RX_DATA | MUX_PAD_CTRL(UART_PAD_CTRL),
        MX6_PAD_SD3_DAT7__UART1_TX_DATA | MUX_PAD_CTRL(UART_PAD_CTRL),
};

第２處，修改SD卡端子

iomux_v3_cfg_t const usdhc2_pads[] = {
        MX6_PAD_SD2_CLK__SD2_CLK        | MUX_PAD_CTRL(USDHC_PAD_CTRL),
        MX6_PAD_SD2_CMD__SD2_CMD        | MUX_PAD_CTRL(USDHC_PAD_CTRL),
        MX6_PAD_SD2_DAT0__SD2_DATA0     | MUX_PAD_CTRL(USDHC_PAD_CTRL),
        MX6_PAD_SD2_DAT1__SD2_DATA1     | MUX_PAD_CTRL(USDHC_PAD_CTRL),
        MX6_PAD_SD2_DAT2__SD2_DATA2     | MUX_PAD_CTRL(USDHC_PAD_CTRL),
        MX6_PAD_SD2_DAT3__SD2_DATA3     | MUX_PAD_CTRL(USDHC_PAD_CTRL),
        //MX6_PAD_NANDF_D4__SD2_DATA4   | MUX_PAD_CTRL(USDHC_PAD_CTRL),
        //MX6_PAD_NANDF_D5__SD2_DATA5   | MUX_PAD_CTRL(USDHC_PAD_CTRL),
        //MX6_PAD_NANDF_D6__SD2_DATA6   | MUX_PAD_CTRL(USDHC_PAD_CTRL),
        //MX6_PAD_NANDF_D7__SD2_DATA7   | MUX_PAD_CTRL(USDHC_PAD_CTRL),
        //MX6_PAD_NANDF_D2__GPIO2_IO02  | MUX_PAD_CTRL(NO_PAD_CTRL), /* CD */
};

第３處，修改不會跟uart1引腳衝突

iomux_v3_cfg_t const usdhc3_pads[] = {
        MX6_PAD_SD3_CLK__SD3_CLK   | MUX_PAD_CTRL(USDHC_PAD_CTRL),
        MX6_PAD_SD3_CMD__SD3_CMD   | MUX_PAD_CTRL(USDHC_PAD_CTRL),
        MX6_PAD_SD3_DAT0__SD3_DATA0 | MUX_PAD_CTRL(USDHC_PAD_CTRL),
        MX6_PAD_SD3_DAT1__SD3_DATA1 | MUX_PAD_CTRL(USDHC_PAD_CTRL),
        MX6_PAD_SD3_DAT2__SD3_DATA2 | MUX_PAD_CTRL(USDHC_PAD_CTRL),
        MX6_PAD_SD3_DAT3__SD3_DATA3 | MUX_PAD_CTRL(USDHC_PAD_CTRL),
        MX6_PAD_SD3_DAT4__SD3_DATA4 | MUX_PAD_CTRL(USDHC_PAD_CTRL),
        MX6_PAD_SD3_DAT5__SD3_DATA5 | MUX_PAD_CTRL(USDHC_PAD_CTRL),
        //MX6_PAD_SD3_DAT6__SD3_DATA6 | MUX_PAD_CTRL(USDHC_PAD_CTRL),
        //MX6_PAD_SD3_DAT7__SD3_DATA7 | MUX_PAD_CTRL(USDHC_PAD_CTRL),
        MX6_PAD_NANDF_D0__GPIO2_IO00    | MUX_PAD_CTRL(NO_PAD_CTRL), /* CD */
};

第４處，定製cd（card detect）端子

//#define USDHC2_CD_GPIO        IMX_GPIO_NR(2, 2)
#define USDHC2_CD_GPIO  IMX_GPIO_NR(1, 4)
#define USDHC3_CD_GPIO  IMX_GPIO_NR(2, 0)

(3)編寫編譯腳本

vi build.sh

#!/bin/sh
export ARCH=arm
export CROSS_COMPILE=arm-none-linux-gnueabi-
make distclean
make mx6qsabresd_config
make

其中mx6qsabresd爲我的平臺名稱

然後chmod +x build.sh

./build.sh即可進行平臺編譯．

(4)SD卡燒寫腳本

vi flash_sd.sh

#!/bin/sh
sudo dd if=u-boot.imx of=/dev/sdb bs=512 seek=2

其中/dev/sdb爲我的sd的設備名稱

chmod +x flash_sd.sh

./flash_sd.sh即可進行ＳＤ鏡像安裝

(5)配置板子從ＳＤ開啓動，串口打印信息如下：

U-Boot 2014.04-08650-g5b983bd-dirty (Oct 05 2015 - 21:39:03)

CPU:   Freescale i.MX6Q rev1.2 at 792 MHz
CPU:   Temperature 31 C, calibration data: 0x5384a769
Reset cause: POR
Board: MX6-SabreSD
I2C:   ready
DRAM:  1 GiB
MMC:   FSL_SDHC: 0, FSL_SDHC: 1, FSL_SDHC: 2
*** Warning - bad CRC, using default environment

No panel detected: default to Hannstar-XGA
Display: Hannstar-XGA (1024x768)
In:    serial
Out:   serial
Err:   serial
mmc0 is current device
Net:   Phy not found
PHY reset timed out
FEC [PRIME]
Warning: failed to set MAC address
=>                                                                              
Normal Boot                                                                     
Hit any key to stop autoboot:  0                                                
mmc0 is current device                                                          
** No partition table - mmc 0 **                                                
** No partition table - mmc 0 **                                                
Booting from net ...                                                            
*** ERROR: `ethaddr' not set                                                    
*** ERROR: `ethaddr' not set                                                    
Bad Linux ARM zImage magic!                                                     
=>