ioremap() bug in Nios2 kernel

Update, please disregard my first port.

Actually, the original code did not do anything about uncache.

I could agree with that, if all the access are consistent.

ie, always use the uncached functions (from io.h) to access memory,

and never mix access with the cached virt address .

see,

http://forum.niosforum.com/forum/index.php...&st=0&p=18788&# (http://forum.niosforum.com/forum/index.php?showtopic=4925&st=0&p=18788&#)