Re: loader crash / BTX halted on 9.0-RC2 DVD with AMD pseudo-RAI
On Tuesday, November 22, 2011 10:07:52 pm John Nielsen wrote:
> On Nov 22, 2011, at 10:26 AM, John Baldwin <jhb@freebsd.org> wrote:
>
> > On Monday, November 21, 2011 1:45:36 pm John Nielsen wrote:
> >> This weekend I downloaded the Freebsd 9.0 RC2 amd64 ISO image and burned it
> > to a DVD. I have a computer that currently runs Windows 7 but I plan to
> > install FreeBSD on it in the near future so I booted it up from the DVD to
> > check the hardware/driver status. Much to my dismay, the boot loader crashed
> > right away (register dump followed by "BTX halted") and the computer
> > immediately rebooted. I took a video with my phone so I could capture the
> > crash message, screenshot here:
> >>
> >> http://picpaste.com/pics/BTXcrash.1321899682.jpg
> >>
> >> I then tried tweaking a few BIOS settings and found that turning off the
> > built-in pseudo-RAID allowed the DVD to boot normally. I changed the SATA type
> > from "RAID" to "AHCI". Fortunately I plan to use the controller in AHCI mode
> > for the FreeBSD installation so this won't end up being a problem for me, but
> > I still thought it was worth reporting.
> >
> > Hmmm, so this is odd. It died with an Invalid TSS exception on the iret
> > instruction at the end of the return-from-real-mode trampoline in BTX.
> > Looking at the dump I noticed that PSL_NT is set in %eflags, so for some
> > reason the iret was trying to do a nested task return. We shouldn't let
> > that flag leak out of any real mode code. Try this patch perhaps:
>
> Thanks for looking!
>
> I put gptboot on a USB stick and tried it with and without the patch.
> Identical behavior in both cases to booting from the DVD (only faster)--BTX
> dump and an instant reboot. I didn't do a screen capture yet but will be
> happy to tomorrow if it will help.
A screen capture would be useful. It may be that I did not fix the right
copy of the flags.
--
John Baldwin
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