Is it possible to move Kernel Virtual Space to 0xE0000000

Hello PPCTeam,
I would like to know whether I can move kernel virtual space to 0xE0000000
from 0xC0000000, if so can someone suggest me what are the pros and cons, I
know moving kernel is not good idea since Non Linux Standard, but then I
need to expand user space as one of my applications uses huge mmap space.
I tried so far
Giving Kernel virtual space to 0xD0000000 and it boots without any problems,
however when I increase it more to 0xE0000000 it throws Program Exception. I
will be glad if someone helps me out with refernces for Linux Porting on
MPCs.

Regards
Subbu