Re: holes for ISA boards...

Mark Jefferys (mjeffery@europa.com)
Fri, 11 Jun 1999 21:12:33 -0700

On Sat, Jun 12, 1999 at 03:07:34AM +0200, Hirling Endre wrote:
% On Fri, 11 Jun 1999, Aaron J. Grier wrote:
%
% > Any idea what's going on? Is it impossible for me to poke a hole in memory
% > from 12-16MB so I can hack on this silly ISA board?
%
% Your patch creates a hole in Linux's virtual address space, but your
% card needs a hole in the physical RAM, or it will conflict with chips
% in that range. I think there's no way to do this with a machine that
% has more than 12M of RAM.

Some BIOSes have the capability of creating a hole within memory just
for supporting legacy ISA cards. My FIC PA-2013 has such an option,
although only for 14-16M or 15-16M hole.

% But then again, you have Linux, an OS that runs fine with even 12M of
% RAM :)

In fact, I activated the memory hole feature when setting up my machine
and ended up with Linux detecting only 14M. It took me a few days to
notice that I was running on vapors...

Which makes me wonder why Linux doesn't support this situation, and where
I could find info that would let me fix it.

Mark

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