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Date:      Mon, 04 May 1998 13:36:59 +0930
From:      Matthew Thyer <thyerm@camtech.net.au>
To:        Jonathan Lemon <jlemon@americantv.com>
Cc:        Andreas Braukmann <braukmann@tse-online.de>, freebsd-current@FreeBSD.ORG
Subject:   Re: 'fatal trap 12' on boot (smp and up)
Message-ID:  <354D3EE3.825EF59E@camtech.net.au>
References:  <19980415202740.43100@paert.tse-online.de> <3536B24B.AF3DBB0D@camtech.net.au> <19980416233701.05315@right.PCS>

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Is anyone working on this problem ?

I like to be able to boot FreeBSD from Win95 with the icon I have
(which runs fbsdboot.exe in DOS mode).

However I can't do this if I have options VM86 in the kernel.


Jonathan Lemon wrote:
> 
> On Apr 04, 1998 at 11:07:15AM +0930, Matthew Thyer wrote:
> > I also get the same crash if *and only if* I boot FreeBSD using
> > FBSDBOOT.EXE from DOS (I have multiple OS's on my disk).
> 
> Okay, that makes sense.  The startup code tries making some INTn
> calls to size memory.  If DOS happens to hook the interrupt vector,
> then the INTn call will try to jump to what it thinks is a DOS
> routine in low memory, which fails.
> 
> Hmm.  I'm not sure what the best solution for this is.
> 
> > The answer for me was to re-install my normal bootblock 'BootEasy'
> > which had been lost when I recently re-installed Windows 95.
> 
> That works, since it doesn't patch the real-mode interrupt vectors.
> 
> > I found that I could successfully boot my kernel built from CTM
> > src-cur 3287 sources  (~Mar 22 which *does* include options VM86).
> 
> I put the new changes in on Mar 23rd...
> --
> Jonathan

-- 
/=====================================================================\
|Work: Matthew.Thyer@dsto.defence.gov.au | Home: thyerm@camtech.net.au|
\=====================================================================/
"If it is true that our Universe has a zero net value for all conserved
quantities, then it may simply be a fluctuation of the vacuum of some
larger space in which our Universe is imbedded. In answer to the
question of why it happened, I offer the modest proposal that our
Universe is simply one of those things which happen from time to time."
 E. P. Tryon   from "Nature" Vol.246 Dec.14, 1973

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