I found a problem in the implementation of io.h for the ixp425.
It wasn't letting me access memory at VMALLOC_START, only after it.
I've included a patch to fix this problem.  This patch is for the
2.4.x kernel, but it looks like it needs fixing in the 2.6.x kernel as
well.
Signed-off-by: Deepak Saxena <dsaxena@plexity.net>