Date: Mon, 10 Apr 2000 17:36:05 -0400 (EDT) From: John Baldwin <jhb@FreeBSD.org> To: Warner Losh <imp@village.org> Cc: hackers@FreeBSD.org Subject: RE: How hard would it be... Message-ID: <200004102136.RAA12324@server.baldwin.cx> In-Reply-To: <200004100128.TAA15168@harmony.village.org>
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On 10-Apr-00 Warner Losh wrote:
> ... to get FreeBSD to boot off a BSD partition that wasn't labeled as
> 0xa5? I'm looking for a way to create a disk that a certain picky
> BIOS will like and boot off of, and I think I have to create it with a
> certain ID and then it will be happy. I suspect that it involves
> hacking the boot blocks, the boot loader and the kernel's idea of the
> BSD partition number in disk*subr.c. Are there other things that are
> needed? I may be barking up the wrong tree in trying to get around
> this BIOS's pickiness, but I thought I'd at least ask.
>
> Yes, this is for a well-known, cheap internet device, which shall
> remain nameless. I've already OPENed mine up. a real lookER.
Heh. Well, I can't speak for the kernel side of things, but for the
rest of the boot strap you would need to change these lines in these
files:
/sys/boot/i386/boot2/boot1.s:
.set PRT_BSD,0xa5 # Partition type
/usr/include/sys/disklabel.h:
#define DOSPTYP_386BSD 0xa5 /* 386BSD partition type */
Once you've done that, go into /sys/boot/i386 and just do a make.
If you update /sys/sys/disklabel.h you might be able to compile a new
kernel and be able to mount, etc., but I'm not sure about that part.
> Warner
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