This tutorial describes hoe to update the firmware files in U-Boot.
1. Boot from eMMC or SD and stop autoboot in U-Boot
Hit any key to stop autoboot: 0 =>
2. Set U-Boot variable mmcdev according to the drive you want to write to
=> setenv mmcdev <Nr.>
3. Connect target device via ethernet to a tftp server supplying the frimware images
4. Provide the correct network configuration in U-Boot:
5. Provide U-Boot the file name of the desired image on the tftp server:
6. Perform Update:
The u-boot update scripts automatically implement the selection of the primary copy to boot.