I have an LS1021A-TWR that I'd like use to run Linux from an SD card, but I'm having trouble getting it to work. First, I tried using the QorIQ SDK 1.7 to build everything and flashed to an SD card, but when booting it has a kernel panic that appears very similar to this one. It appears the author of that post fixed his issue by using u-boot 2015.01, but after flashing both mainline 2015.01 and 2015.04, I can't seem to use the "ext2load" command anymore as it says "Unknown command 'ext2load' - try 'help' ". I don't have much experience with u-boot and embedded systems, so I'm not sure if there is some configuration required when building u-boot to enable ext2load or if there's another way I should be configuring u-boot to read the kernel and dtb files from the SD card. Any help is appreciated, thanks!