Date: Sat, 9 Dec 2000 19:36:43 +0200 (SAST) From: Robert Nordier <rnordier@nordier.com> To: rizzo@aciri.org, lab@gta.com Cc: small@freebsd.org Subject: Re: non-standard floppy formats ? Message-ID: <200012091736.eB9HaiH00638@nordier.com> In-Reply-To: <20001208224852.A29661@max.gta.com> from "Larry Baird" at Dec 08, 2000 10:48:52 PM
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Larry Baird wrote: > On Fri, Dec 08, 2000 at 06:02:23PM -0800, Luigi Rizzo wrote: > > > I think the problem is in boot1.s of boot2. Look at the function > > > read(). The first thing is does is do an int13 call to get the > > > BIOS configuration of the floppy. The result that is causing > > > you a problem is "cylinders per track" (returned in register cl). > > > You could hardcode the code after the int13 to set register cl > > > to your new floppy geometry. > > > > tried that, but it seems that the bios does not like that. Probably > > (at least on the system i tried) it still checks for the sector > > number to be admissible for the geometry it knows. > Are you familiar with the following site? > http://www.ctyme.com/rbrown.htm There's no simple way to reliably boot something the size of FreeBSD from a floppy in non-standard format. Your best approach would be to look at something like Christoph Hochstaetter's fdformat to get an idea of what's needed to fool BIOS into handling this stuff. -- Robert Nordier rnordier@nordier.com rnordier@FreeBSD.org To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-small" in the body of the message
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