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Date:      Thu, 17 Feb 2000 15:05:47 -0500 (EST)
From:      John Baldwin <jhb@FreeBSD.org>
To:        Mike Smith <msmith@FreeBSD.org>
Cc:        freebsd-current@FreeBSD.org, Gerald Abshez <gerald@manhattanprojects.com>, "David E. Cross" <crossd@cs.rpi.edu>
Subject:   Re: Thinkpad won't boot ISO image
Message-ID:  <200002172005.PAA68820@server.baldwin.cx>
In-Reply-To: <200002172005.MAA00520@mass.cdrom.com>

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On 17-Feb-00 Mike Smith wrote:
>> 
>> On 17-Feb-00 Mike Smith wrote:
>> >> 
>> >> On 16-Feb-00 Mike Smith wrote:
>> >> >> This is a problem with the thinkpad BIOS that I have not had the time to be
>> >> >> able to track down.  It would *appear* to be that the BIOS does not do 
>> >> >> int 13 handling on boot cdroms, and the boot/loader makes much use of that 
>> >> >> for loading the kernel and drivers.
>> >> > 
>> >> > The problem with the Thinkpad BIOS is where it puts the emulated floppy 
>> >> > image's disk number - it's not in the 'normal' place, and I don't exactly 
>> >> > know how to deal with it cleanly.  If someone were to lend me a thinkpad 
>> >> > or look at this it would be easy to fix.
>> >> 
>> >> Err, which place?  The emulated device is always BIOS drive 0x00, aka the
>> >> first floppy drive when you are emulating a floppy.
>> > 
>> > It's not, which is the "Thinkpad CDROM boot problem".  The one report I 
>> > recall put it on 0x87, but I don't have any concrete evidence to suggest 
>> > that it's always there either.
>> 
>> Gah.  Then they need to learn how to read standards.  It is passed in via %dl
>> at least?
> 
> After David's response, I'm wondering whether the problem isn't that they 
> _arent_ passing the value in via %dl, and we're just getting trash.  Not 
> sure how it is that boot1/2 are working though.

I don't think boot1/2 would work at all if %dl was wrong.  One thing to note, is
that when I finally get cdboot working to the point of loading the loader, I am
going to have a similar problem since the device number typically used when booting
from a CD is 0x9f, which is not contiguous from 0x80. 

-- 

John Baldwin <jhb@FreeBSD.org> -- http://www.FreeBSD.org/~jhb/
PGP Key: http://www.cslab.vt.edu/~jobaldwi/pgpkey.asc
"Power Users Use the Power to Serve!"  -  http://www.FreeBSD.org/


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