If U-Boot is already running on your board, you can use this easily
to to download another U-Boot image and install this in place of the
existing image.

Warning: Before you can install the new image, you have to erase the
current one. If anything goes wrong your board will be dead. It is
strongly recommended that you make sure that:
- you have a backup of the old, known to work image
- you know how to install an image on a virgin system

Proceed as follows:
Note: Included topic
DULGData.canyonlandsInstallUBootUsingUBoot? does not exist yet