Subject: Re: port-macppc/30410: netbsd-2, netbsd-3, and -current GENERIC crash
To: None <port-macppc-maintainer@netbsd.org, gnats-admin@netbsd.org,>
From: Timo Schoeler <timo.schoeler@macfinity.net>
List: netbsd-bugs
Date: 06/02/2005 22:28:02
The following reply was made to PR port-macppc/30410; it has been noted by GNATS.
From: Timo Schoeler <timo.schoeler@macfinity.net>
To: gnats-bugs@netbsd.org
Cc: port-macppc-maintainer@netbsd.org, netbsd-bugs@netbsd.org
Subject: Re: port-macppc/30410: netbsd-2, netbsd-3, and -current GENERIC crash
with MCHK trap on G4
Date: Fri, 03 Jun 2005 00:27:48 +0200
thus riz@tastylime.net spake:
>>Number: 30410
>>Category: port-macppc
>>Synopsis: post-2.0 GENERIC kernels crash with MCHK trap on G4/466
>>Confidential: no
>>Severity: critical
>>Priority: high
>>Responsible: port-macppc-maintainer
>>State: open
>>Class: sw-bug
>>Submitter-Id: net
>>Arrival-Date: Thu Jun 02 22:13:00 +0000 2005
>>Originator: Jeff Rizzo
>>Release: NetBSD 2.0_STABLE
>>Organization:
>>Environment:
>
>
>
> System: NetBSD grendel 2.0_STABLE NetBSD 2.0_STABLE (GENERIC) #0: Sun May 22 18:12:21 PDT 2005 riz@grendel:/home/riz/buildobj/usr/src/sys/arch/macppc/compile/GENERIC macppc
> Architecture: powerpc
> Machine: macppc
>
>>Description:
>
> A GENERIC kernel compiled in the standard way (no special COPTS)
> crashes with an MCHK trap during bootup on certain G4 systems.
>
> Here's the crash message, in a ten-finger copy:
>
> [...boot messages...]
> atapibus0 at atabus1: 2 targets
> trap: pid 3.1 (atabus1): kernel MCHK trap @ 0x518e0c (SRR1=3D0x2041020)
> panic: trap
> Stopped in pid 3.1 (atabus1) at netbsd:cpu_Debugger+0x18: lwz r11, r1, 0x0
> db>
>
> There have been several mailing list threads about this. Most recently:
>
> http://mail-index.netbsd.org/port-macppc/2005/04/03/0003.html
>
> Note that compiling GENERIC with certain flags (such as -O3, or -maltivec)
> creates a kernel that _does_ boot.
>
>
>>How-To-Repeat:
>
> Try to boot a -current, 3.0_BETA, or 2.0_STABLE GENERIC kernel
> on a power mac G4.
>
>
>>Fix:
>
>
> Workaround: compile the kernel with COPTS+=-O3 .
IIRC somebody mentioned that it's possible to solve via some fiddling on
PowerPC assembler code used. unfortunately, i'm not able to dig into this...
cheers,
--
Timo Schoeler | http://macfinity.net/~tis | timo.schoeler@macfinity.net
//macfinity -- finest IT services | http://macfinity.net
Key fingerprint = F844 51BE C22C F6BD 1196 90B2 EF68 C851 6E12 2D8A
There are 10 types of people in the world. Those who understand binary
and those who don't.