Date: Fri, 8 Dec 2000 11:03:05 +1000 From: "Andrew Hannam" <famzon@bigfoot.com> To: "Larry Baird" <lab@gta.com>, <small@FreeBSD.ORG> Subject: Re: non-standard floppy formats ? Message-ID: <006b01c060b3$33edaa40$0104010a@famzon.com.au> References: <200012072203.RAA39082@gta.com>
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I have had this working with no changes to the boot code.
Conditions:
PicoBSD based on kernel V3.4
No /boot/loader - I set the boot0 stuff to load a compressed kernel
directly.
Maybe this was just a plain blind luck the it worked ?!!
----- Original Message -----
From: "Larry Baird" <lab@gta.com>
To: <small@freebsd.org>
Cc: "Luigi Rizzo" <rizzo@aciri.org>
Sent: Friday, December 08, 2000 8:03 AM
Subject: Re: non-standard floppy formats ?
> In article <200012070036.eB70a2X00376@iguana.aciri.org> you wrote:
> > Hi,
> > i was trying to make picobsd work with non-standard floppy
> > formats (1722k specifically), but i am having a hard time.
> > Basically, the boot2 code says "Not ufs", i think this is
> > because it tries to read from the disk using the BIOS
> > and the BIOS only knows about the 80 track/18 sector
> > format, and not the 82*21 format used for 1722k. Am i correct ?
>
> > This is really bad because in the additional 300K there would
> > be a lot of stuff one could squeeze in.
> 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.
>
> Larry
>
> --
> ------------------------------------------------------------------------
> Larry Baird | http://www.gnatbox.com
> Global Technology Associates, Inc. | Orlando, FL
> Email: lab@gta.com | TEL 407-380-0220, FAX 407-380-6080
>
>
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