I have partially solved this problem:
I'm running this app under Windows 7, and needed to run the app as an administrator.
However when I try and run Android it fails. I have entered the following into uBoot:
U-Boot > setenv bootcmd booti mmc2 [Load the boot.img from SD card]
U-Boot > setenv bootargs console=ttymxc0,115200 init=/init video=mxcfb0 video=mxcfb1:off
video=mxcfb2:off fbmem=10M fb0base=0x27b00000 vmalloc=400M androidboot.console=ttymxc0
[Optional]
U-Boot > saveenv [Save the environments]
The above was taken from page 11 of the Android user guide. However uBoot says booti is an unknown command.
What else is needed to make Android boot successfully?