Kernel internals for ARM

Hi,

Does anybody have a good pointer on Linux kernel internals for ARM architecture? I can locate plenty for x86 but since ARM is RISC I think there would be subtle changes. So if somebody has a knowledge of good document on Linux Kernel internals for ARM or even a comparative study of kernel on x86 and ARM (listing out the differences), I would appreciate sharing it or pointing me to it.

Thanks,
Rakesh