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/ To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-current" in the body of the message
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