Re: Assembler coding help needed. [solved, patch enclosed]
From: John Baldwin (jhb_at_FreeBSD.org)
Date: 01/12/04
- Previous message: M. Warner Losh: "Re: Future of RAIDFrame and Vinum"
- In reply to: Martin Nilsson: "Re: Assembler coding help needed. [solved, patch enclosed]"
- Messages sorted by: [ date ] [ thread ] [ subject ] [ author ]
To: Martin Nilsson <martin@gneto.com>, Marcin Dalecki <mdcki@gmx.net> Date: Mon, 12 Jan 2004 15:30:20 -0500
On Sunday 11 January 2004 04:39 pm, Martin Nilsson wrote:
> Marcin Dalecki wrote:
> > Martin Nilsson wrote:
> >> I'm trying to find out why I can't boot 5.2 from USB CDROM on
> >> Supermicro motherboards. (I have an old Gateway P3 that can!).
> >>
> >> I've found out that that only 0x20 of 0x4c sectors of the loader are
> >> read in and it therfor traps when executed. (read is only called once).
> >>
> >> load_notrunc: sub %dh,%cl # Update count
> >> push %eax # Save
> >> call read # Read it in
> >
> > The fun will be ^^^^ here. The rest is self contained and
> > doesn't depend on CPU variant or periphery.
>
> I found the problem!
> The bios trashes %cx when reading from USB CD but not when reading from
> ATAPI CD.
>
> The attached patch fixes this and two other small nits in
> sys/boot/i386/cdboot/cdboot.s
Thanks for the nit fixes.
> Can somebody (jhb) commit this?
>
> This probably affects all Phoenix-Award bios equipped boxes. My old
> Gateway with AMI BIOS works as it should.
I will commit something similar. I will save %cx around the BIOS call itself
in the read function.
-- John Baldwin <jhb@FreeBSD.org> <>< http://www.FreeBSD.org/~jhb/ "Power Users Use the Power to Serve" = http://www.FreeBSD.org _______________________________________________ freebsd-hackers@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-hackers To unsubscribe, send any mail to "freebsd-hackers-unsubscribe@freebsd.org"
- Previous message: M. Warner Losh: "Re: Future of RAIDFrame and Vinum"
- In reply to: Martin Nilsson: "Re: Assembler coding help needed. [solved, patch enclosed]"
- Messages sorted by: [ date ] [ thread ] [ subject ] [ author ]
Relevant Pages
|
