(snip)

The crucial thing is mmap some region of io space
read from a page write to the same page
Repeat and rinse, something will corrupt the system.

reads alone are ok.
writes alone are ok.
write followed by any combination of reads or writes is ok
read followed by write = trouble

I am an embedded PPC Linux novice, so, tell me if I'm way off base.
This sounds like a pipeline problem; out of order I/O execution.
Could there be an "eieio" missing somewhere?

Greg Griffes


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