How to Load root-fs image from USB after boot-up with ubuntu OS
1. Make an ext4 partition in usbdisk
2. Extract GTI official Ubuntu rootfs directly to ext4 partition
3. Modify u-boot bootcmd
env default -a
setenv image_name boot/Image
setenv fdt_name boot/armada-7040-mochabin.dtb
setenv bootcmd ‘usb reset; part uuid usb 0:1 partuuid; load usb 0:1 $kernel_addr_r $image_name; load usb 0:1 $fdt_addr_r $fdt_name; setenv bootargs $console root=PARTUUID=$partuuid rw rootwait net.ifnames=0 biosdevname=0 $extra_params; booti $kernel_addr_r – $fdt_addr_r’
saveenv
boot
4. More to say,
The above “load USB 0:1” represents USB device 0, partition 1. If ext4 partition is not in partition 1, it needs to be corrected accordingly
In addition, when U-boot captures USB disks, sometimes it doesn’t capture USB storage somehow, so you need to perform USB reset to retrieve it again
