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From: migieger@luva.stgt.sub.org (Michael Giegerich)
Subject: Re: FreeBSD, 16 to 32MB unrecognized on EISA machine
References: <348au2$bd@csnews.cs.colorado.edu> <348efq$l1v@orion.cc.andrews.edu>
Organization: private FreeBSD site
Date: Sun, 4 Sep 1994 09:37:11 GMT
Message-ID: <CvLMqD.7Is@luva.stgt.sub.org>
Lines: 68
In article <348efq$l1v@orion.cc.andrews.edu>,
Andrew Gillham <gillham@andrews.edu> wrote:
>In article <348au2$bd@csnews.cs.colorado.edu> rickcole@redwood.cs.Colorado.EDU (Rick Cole) writes:
>>
>>I recently saw someone ask this same question, but can't find it now.
>>Upgrading from 16 to 32MB mem. on a Dell EISA machine with an EISA
>>SCSI controller. The new 16MB are not recognized/used. However,
>>boot-up does give some indication that it is there (first line of
>>boot-up says "386bsd ... at ... 639/31744" or somesuch), and my CMOS
>>setup says it's there, and DOS thinks it's there, but I still get
>>"Testing 15MB" only. Ideas? -Rick
>
>I have the same problem on a Dell 466SE. Dell must store the
>extended memory differently in the CMOS. I ended up having to
Me too. With a Dell 425TE - It's their Phoenix BIOS, it stores
only 15 MB of extended memory.
One Dell employee told me they are doing this for compatibility
reasons...
>"hardcode" my RAM in /sys/arch/i386/i386/machdep.c (this is netbsd)
>The line looks like:
> biosextmem = (rtcin(RTC_EXTHI)<<8) | (rtcin(RTC_EXTLO));
>You change it to be:
> biosextmem = 31 * 1024; /* 31MB of extended, 1MB of base */
>Or '63 * 1024', etc..
Did the same for FreeBSD-1.0.2 when I added memory to 20 MB total.
Here the patches for *two* files:
*** usr/src/sys/i386/boot/bios.S-1.0.2 Fri Nov 5 08:36:04 1993
--- usr/src/sys/i386/boot/bios.S Sun Jan 30 11:10:18 1994
***************
*** 317,322 ****
--- 317,325 ----
int $0x15
cli
+ xor %ax, %ax #
+ movb $0x4c, %ah # hardcoded 19M ext. memory
+
xdone:
mov %eax, %ebx
*** usr/src/sys/i386/i386/machdep.c-1.0.2 Sun Dec 12 00:24:34 1993
--- usr/src/sys/i386/i386/machdep.c Sun Jan 30 10:56:43 1994
***************
*** 1071,1076 ****
--- 1071,1079 ----
*/
biosbasemem = rtcin(RTC_BASELO)+ (rtcin(RTC_BASEHI)<<8);
biosextmem = rtcin(RTC_EXTLO)+ (rtcin(RTC_EXTHI)<<8);
+
+ biosextmem = 0x4c00; /* hardcoded 19M ext. memory */
+
/*printf("bios base %d ext %d ", biosbasemem, biosextmem);*/
/*
Hope this helps,
-Michael
--
------------------------------+------------------------------
Michael Giegerich | migieger@luva.lb.bawue.de
| (migieger@luva.stgt.sub.org)
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