In my own experiments, I had success using commands like these:
ext2load mmc 0:2 0x90007fc0 uImage ext2load mmc 0:2 0x907fffc0 initrd.uImg [...] bootm 0x90007fc0 0x907fffc0
The choice of 0x907fffc0 was arbitrary, but seemed to work for me (assuming the kernel zImage is < 8MB of course)
In my own experiments, I had success using commands like these:
ext2load mmc 0:2 0x90007fc0 uImage
ext2load mmc 0:2 0x907fffc0 initrd.uImg
[...]
bootm 0x90007fc0 0x907fffc0
The choice of 0x907fffc0 was arbitrary, but seemed to work for me (assuming the kernel zImage is < 8MB of course)