Linux Lab 正在新增对真实开发板的支持-IMX6ULL

### 手动运行uboot-2020.10 + Linux5.10.0 方法及存在的问题：
1. Linux Host下编译步骤

```
$git clone git://git.busybox.net/buildroot
$cd buildroot
$make imx6ullevk_defconfig
$make menuconfig
```

这里选择kernel和Bootloader版本如下，其他默认即可
	kernel-> kernel version : 5.10
	Bootloader -> U-boot Version : 2020.10

```
$ make -j8
$ ls output/images/ -al
total 91656
drwxr-xr-x 2 vmuser vmuser     4096 1月   2 16:47 .
drwxr-xr-x 6 vmuser vmuser     4096 1月   1 23:51 ..
-rw-r--r-- 1 vmuser vmuser 16777216 1月   2 16:47 boot.vfat
-rwxr-xr-x 1 vmuser vmuser    30847 1月   2 16:46 imx6ull-14x14-evk.dtb
-rw-r--r-- 1 vmuser vmuser 62914560 1月   2 16:47 rootfs.ext2
lrwxrwxrwx 1 vmuser vmuser       11 1月   2 16:47 rootfs.ext4 -> rootfs.ext2
-rw-r--r-- 1 vmuser vmuser 18923520 1月   2 16:47 rootfs.tar
-rw-r--r-- 1 vmuser vmuser 88080384 1月   2 16:47 sdcard.img
-rw-r--r-- 1 vmuser vmuser   371855 1月   2 16:14 u-boot.bin
-rw-r--r-- 1 vmuser vmuser   375808 1月   2 16:14 u-boot-dtb.imx
-rw-r--r-- 1 vmuser vmuser  9528384 1月   2 16:46 zImage
```

这里的sdcard.img 就是我们要烧写的SD卡的镜像

2. 准备SD卡镜像(Linux PC或虚拟机下)
注意：这里X为你的SD卡插入到Linux PC或虚拟机下的设备符，正确识别
`$ sudo dd if=output/images/sdcard.img of=/dev/sdX && sync`

3. 将SD（TF）卡插入板子的TF卡槽，连接串口线

4. 打开串口终端并给开发板上电

5. 在u-boot console下执行如下命令：

```
=> fatload mmc 0 80800000 /zImage
=> run mmcboot

```

就可以运行起来5.10内核啦。。。。。。

Todo List：

1）u-boot 为何不能正确加载zImage？
2）rootfs还是用的emmc上的，而不是SD卡上的？是mmcroot=/dev/mmcblk1p2 这里配置的不对吗？
3）将u-boot 2020.10 和linux 5.10.0 版本适配到Linux Lab

附上最新u-boot的env：

```
=> printenv
baudrate=115200
board_name=EVK
board_rev=14X14
boot_fdt=try
bootargs=console=ttymxc0,115200 root=/dev/nfs ip=dhcp nfsroot=:,v3,tcp
bootcmd=run findfdt;mmc dev ${mmcdev};mmc dev ${mmcdev}; if mmc rescan; then if run loadbootscript; then run bootscript; else if run loadimage; then run mmcboot; else run netboot; fi; fi; else run netboot; fi
bootdelay=2
bootscript=echo Running bootscript from mmc ...; source
console=ttymxc0
ethprime=eth1
fdt_addr=0x83000000
fdt_file=imx6ull-14x14-evk.dtb
fdt_high=0xffffffff
fdtcontroladdr=9ef95f30
fileaddr=80800000
filesize=916440
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 = 14X14; then setenv fdt_file imx6ull-14x14-evk.dtb; fi; if test $fdt_file = undefined; then echo WARNING: Could not determine dtb to use; fi; fi;
get_cmd=dhcp
image=uImage
initrd_high=0xffffffff
ip_dyn=yes
loadaddr=0x80800000
loadbootscript=fatload mmc ${mmcdev}:${mmcpart} ${loadaddr} ${script};
loadfdt=fatload mmc ${mmcdev}:${mmcpart} ${fdt_addr} ${fdt_file}
loadimage=fatload mmc ${mmcdev}:${mmcpart} ${loadaddr} ${image}
mmcargs=setenv bootargs console=${console},${baudrate} root=${mmcroot}
mmcautodetect=yes
mmcboot=echo Booting from mmc ...; run mmcargs; if test ${boot_fdt} = yes || test ${boot_fdt} = try; then if run loadfdt; then bootz ${loadaddr} - ${fdt_addr}; else if test ${boot_fdt} = try; then bootz; else echo WARN: Cannot load the DT; fi; fi; else bootz; fi;
mmcdev=0
mmcpart=1
mmcroot=/dev/mmcblk1p2 rootwait rw
netargs=setenv bootargs console=${console},${baudrate} root=/dev/nfs ip=dhcp nfsroot=${serverip}:${nfsroot},v3,tcp
netboot=echo Booting from net ...; run netargs; if test ${ip_dyn} = yes; then setenv get_cmd dhcp; else setenv get_cmd tftp; fi; ${get_cmd} ${image}; if test ${boot_fdt} = yes || test ${boot_fdt} = try; then if ${get_cmd} ${fdt_addr} ${fdt_file}; then bootz ${loadaddr} - ${fdt_addr}; else if test ${boot_fdt} = try; then bootz; else echo WARN: Cannot load the DT; fi; fi; else bootz; fi;
script=boot.scr
stderr=serial
stdin=serial
stdout=serial
videomode=video=ctfb:x:480,y:272,depth:24,pclk:108695,le:8,ri:4,up:2,lo:4,hs:41,vs:10,sync:0,vmode:0

Environment size: 2259/8188 bytes

```

GVP 泰晓科技/Linux Lab

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GVP泰晓科技/Linux Lab

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