Subject: 128Mbyte memory Pentium Pro problem
To: None <current-users@NetBSD.ORG>
From: Tim W. Janes <email@example.com>
Date: 07/26/1996 11:49:00
I am having problems getting NetBSD to see the full 128Mbytes of
memory in a Dell Dimension Pentium Pro machine.
I have been trying various values for the EXTMEM_SIZE parameter in the
kernel config file with some success.
I can increase it up to 111*1024 Kbytes without any problem.
(setting EXTMEM_SIZE= 113664 boot message reports 117047296 bytes)
If I go up to 119*1024 Kbytes ( or any number above) the system will
not boot - it ends up in the debugger.
(setting EXTMEM_SIZE= 121856 boot message reports 125435904 bytes)
I have not determined the exact figure that breaks the system, but it
is between 111 and 119 Mbytes.
The debugger trace is as follows ( manually copied leaving out all the
Changing root device to wd0a
panic: ptdi 24e023
_Debugger (......) at _Debugger+0x4
In fact I have only borrowed this Dell machines to try out PentiumPro
+ NetBSD for a particualr application prior to purchasing a number of
machines (with 128Mbytes memory) of our own.
Is this problem common to all 128Mbyte Pentium Pro's - if not
which Motherboards are OK?
Or is this a known problem that can be fixed?
Thanks for any help
Tim Janes | e-mail : firstname.lastname@example.org
Defence Research Agency | tel : +44 1684 894100
Malvern Worcs | fax : +44 1684 895103
Gt Britain | #include <std/disclaim.h>