Ah, I was looking for it again, and didn't come up with it. Thanks for
re-pointing me to it.
Anyway, the problem I was having turned out to actually be somewhat
bigphysarea-related. In the earlier kernels, the pointer that
bigphysarea_alloc returned was below PAGE_OFFSET (0xc0000000 in my
case), while in 2.1.11X, it was above. Telling the hardware to DMA
there seemes to work, but when I tell mmap where to map to I need to
apply the __pa macro to it to get it to work.
What becomes clear here is that I don't quite understand all the
different memory maps that exist in linux. Does anybody have a good
source for (current) information on this, or willing to offer a short
description of what I'm looking at?
One thing that changed between 2.1.85 and 2.1.11X, as far as I can tell,
is at some of the static allocation of memory that happens in
init/main.c. I'd like to make a bigphys-2.1.113 patch, and I've got a
working system now, but I'd like to make sure its something close to the
right working system.
Thanks for the help,
-Chris
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