How to Upgrade U-Boot

Please follow the following steps to upgrade u-boot on your board:

1. First download "6x_upgrade" and "upgrade.scr" from the following link:
   http://linode.boundarydevices.com/u-boot-images/ 
2.  (if you already have a u-boot file of your own that you want to upgrade to, please ignore this step) Then if you want to upgrade your u-boot to the latest version download the specific u-boot file for your board from the following link:
   http://linode.boundarydevices.com/u-boot-images/
   For example for nitrogen8m board, download "u-boot.nitrogen8m". If you are unsure about which version to use, U-Boot should be able to tell you by issuing the following command in its prompt:
   

=> printenv uboot_defconfig uboot_defconfig=nitrogen8m Do NOT flash a different U-Boot, if unsure, please contact us.

3. Copy "6x_upgrade", "upgrade.scr" and the u-boot file to the root of your storage media. (It can be a SD card, eMMC or USB drive)
4. Insert the storage media into your board.
5. Connect the board using the serial cable to your host pc, turn on the board and stop it in u-boot through console on your host pc. If unsure on how to connect the serial cable, please read this article: Getting Started Part 1: Serial Connection 
6. Type the following command in U-Boot prompt:

=> run upgradeu

7. Wait until it finishes and then restart the board.
8. Enjoy

As always, let us know your experiences (both good and bad).