Date: Wed, 15 Apr 1998 22:18:29 +0200 From: Andreas Braukmann <braukmann@tse-online.de> To: freebsd-current@FreeBSD.ORG Subject: Re: 'fatal trap 12' on boot (smp and up) Message-ID: <19980415221829.03759@paert.tse-online.de> In-Reply-To: <19980415141155.44599@right.PCS>; from Jonathan Lemon on Wed, Apr 15, 1998 at 02:11:55PM -0500 References: <19980415202740.43100@paert.tse-online.de> <19980415141155.44599@right.PCS>
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Hello,
On Wed, Apr 15, 1998 at 02:11:55PM -0500, Jonathan Lemon wrote:
> On Apr 04, 1998 at 08:27:40PM +0200, Andreas Braukmann wrote:
> > The hardware:
> > * Gigabyte 686DX Dual PPro 200
> > * Award BIOS
> > * 128 MB Ram
> >
> > The trap: (from the uni-proc. kernel, cited from hand-written notes)
> > Fatal trap 12: page fault while in vm86 mode
> > fault virtual address: 0x26e0
> > fault code: user read, page not present
> > ip = 0x24a:0x240
> > sp = 0x0:0xff8
> > fp = 0x0:0x0
> > cs = base 0xf0000008, limit 0xd14c8, type 0xf
> > DPL 0, pres 1, def 32 0, gran 0
> > proc eflags = trace trap, int enabled, resume, vm86, IOPL=0
> > cur proc = idle
> > int mask = net tty bio cam
>
> This is the VM86 memory sizing code on bootup; it is trying to coax the
> BIOS to tell it how much memory is in the machine. The BIOS routines
> are supposed to be at 0xA0000, for some reason, your machine is trying
> to execute code at 0x26e0. This fails, since I haven't mapped that
> particular page page into the address space.
hmmm, anybody out here with the same mainboard? Which BIOS-revision does
it have?
> Do you have `BIOS shadowing' set in your BIOS? Try turning if off, if so.
no.
> For a quick workaround, you can just take out "options VM86" from
> the kernel, but I'd really like to try to get this fixed.
It works. My smp-kernel is up and running without 'vm86'.
Tomorrow I will do some more tests.
Thanks for the help.
Regards,
Andreas
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