Date: Thu, 22 Jun 1995 14:40:01 -0700 From: regnauld@tetard.frmug.fr.net To: freebsd-bugs Subject: i386/541: Alternate Reset method by unmapping ALSO broken Message-ID: <199506222140.OAA27154@freefall.cdrom.com> In-Reply-To: Your message of Thu, 22 Jun 1995 20:01:46 %2B0200 <199506221801.UAA01032@tetard.freenix.fr>
index | next in thread | previous in thread | raw e-mail
>Number: 541
>Category: i386
>Synopsis: Alternate Reset method by unmapping ALSO broken
>Confidential: no
>Severity: critical
>Priority: high
>Responsible: freebsd-bugs (FreeBSD bugs mailing list)
>State: open
>Class: sw-bug
>Submitter-Id: current-users
>Arrival-Date: Thu Jun 22 14:40:01 1995
>Originator: Philippe Regnauld
>Organization:
>Release: FreeBSD 2.0-BUILT-19950615 i386
>Environment:
- 486 DX 2/80 (*Processor is AMD*)
- Motherboard is 30pin/72pin RAM 486 VLB Isa
(keyboard controller could not be located)
- FreeBSD 2.0.5 current
>Description:
Keyboard Reset supposedly bogus, and shutdown -r or reboot
systematically produces:
Keyboard reset did not work, attempting CPU shutdown
... and then the system hangs.
I've tried localizing the problem by inserting visual checkpoints
in /sys/i386/i386/vm_machdep.c (line 786+)
----
/* force a shutdown by unmapping entire address space ! */
-> printf("Unmapping address space:");
bzero((caddr_t) PTD, NBPG);
-> printf(" Done.\n");
/* "good night, sweet prince .... <THUNK!>" */
-> printf("Pmap Update:");
pmap_update();
-> printf(" Done.\n");
/* NOTREACHED */
while(1);
---
After recompiling a kernel and booting it, the result is this:
Keyboard reset did not work, attempting CPU shutdown
Unmapping address space:
... and nothing more.
Obviously bzero((caddr_t) PTD, NBPG) never makes it...
(Pretty annoying, as I can't be away long if it crashes and
attempts to reboot while I'm not around (like this summer...))
>How-To-Repeat:
# shutdown -r now
or
# reboot
>Fix:
Unknown.
>Audit-Trail:
>Unformatted:
help
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?199506222140.OAA27154>