EBC access

[Silwer star]

Hi,

I am working on the PPC 405EX processor with a peripheral attached to the
EBC. I've requested for I/O memory & mapped it using ioremap. The following
are my doubts:

1) How do I ensure that the memory range that I requested is non-cacheable.
I've to work with non-cacheable memory.  I've requested for memory using
request_mem_region( ). 
2) Between any consecutive writes or any consecutive reads, if I introduce a
delay of 500msec, the read/write is completing.  Does this have to do
anything with caching? What could be the  reason for this?

Any help will be appreciated.

Regards,
Silwer Star
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