Load Images With U-Boot Via TFTP

With an available network connection, U-Boot can load images quickly and easily via TFTP.

Preparation

Setup TFTP Server for U-Boot

We’ll start off with a terminal connected to the board and sitting at the U-Boot prompt.

Upgrade Bootloader

1 2	kvim# tftp 1080000 u-boot.bin kvim# store rom_write 1080000 0 $filesize

Note
You might also need to clean up the old U-Boot environment value stored in the env partition, and then save it as a new value:
1
2
kvim# defenv
kvim# saveenv
Run reset or press reset button to boot from the new bootloader:
1
kvim# reset

Load and Run boot.img

Load image into memory, then run bootm to boot from memory:

1 2	kvim# tftp 1080000 boot.img kvim# bootm

Note
Only for Android.

Load and Run Linux Kernel Image

Download and run Linux:

kvim# tftp 1080000 zImage
kvim# tftp 10000000 uInitrd
kvim# tftp 20000000 kvim.dtb 
kvim# booti 1080000 10000000 20000000

Note
Only for Ubuntu.

Troubleshooting

Failed to saveenv:

kvim# saveenv
Saving Environment to aml-storage...
get partition info failed !!
kvim#

You need to write a DTB first!

Resources

U-Boot Offical Guide