Date: Tue, 9 Sep 1997 10:00:01 -0700 (PDT) From: Tor Egge <Tor.Egge@idi.ntnu.no> To: freebsd-bugs Subject: Re: kern/4486: ahc(4) in RELENG_2_2 can't do kernel core dumps Message-ID: <199709091700.KAA20310@hub.freebsd.org>
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The following reply was made to PR kern/4486; it has been noted by GNATS.
From: Tor Egge <Tor.Egge@idi.ntnu.no>
To: j@uriah.heep.sax.de
Cc: FreeBSD-gnats-submit@FreeBSD.ORG
Subject: Re: kern/4486: ahc(4) in RELENG_2_2 can't do kernel core dumps
Date: Tue, 09 Sep 1997 18:50:44 +0200
Some S3 cards does not like accesses to the monocrome
video memory address region (starting at memory address 0xb8000),
and the memory dump hangs when dumping that region.
With the following ugly hack/workaround, and defining SDDUMP_HANGS
as an option in the kernel config file, the kernel will probably be
able to perform a core dump.
Index: sd.c
===================================================================
RCS file: /home/ncvs/src/sys/scsi/sd.c,v
retrieving revision 1.95.2.3
diff -c -r1.95.2.3 sd.c
*** sd.c 1997/08/11 02:04:09 1.95.2.3
--- sd.c 1997/08/27 16:57:47
***************
*** 932,937 ****
--- 932,944 ----
blknum = dumplo + blkoff;
while (num > 0) {
+ #if defined(SDDUMP_HANGS) && defined(__i386__)
+ if ((vm_offset_t) addr>=0xa0000 &&
+ (vm_offset_t) addr < 0x100000)
+ pmap_enter(kernel_pmap, (vm_offset_t)CADDR1, trunc_page(0),
+ VM_PROT_READ, TRUE);
+ else
+ #endif
pmap_enter(kernel_pmap, (vm_offset_t)CADDR1, trunc_page(addr),
VM_PROT_READ, TRUE);
/*
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