Re: loader crash / BTX halted on 9.0-RC2 DVD with AMD pseudo-RAI
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 i=
t=20
> to a DVD. I have a computer that currently runs Windows 7 but I plan to=20=
> install FreeBSD on it in the near future so I booted it up from the DVD to=
=20
> check the hardware/driver status. Much to my dismay, the boot loader crash=
ed=20
> right away (register dump followed by "BTX halted") and the computer=20
> immediately rebooted. I took a video with my phone so I could capture the=20=
> crash message, screenshot here:
>>=20
>> http://picpaste.com/pics/BTXcrash.1321899682.jpg
>>=20
>> I then tried tweaking a few BIOS settings and found that turning off the=20=
> built-in pseudo-RAID allowed the DVD to boot normally. I changed the SATA t=
ype=20
> from "RAID" to "AHCI". Fortunately I plan to use the controller in AHCI mo=
de=20
> for the FreeBSD installation so this won't end up being a problem for me, b=
ut=20
> I still thought it was worth reporting.
>=20
> Hmmm, so this is odd. It died with an Invalid TSS exception on the iret=20=
> instruction at the end of the return-from-real-mode trampoline in BTX. =20=
> Looking at the dump I noticed that PSL_NT is set in %eflags, so for some=20=
> 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. Identi=
cal behavior in both cases to booting from the DVD (only faster)--BTX dump a=
nd an instant reboot. I didn't do a screen capture yet but will be happy to t=
omorrow if it will help.
JN
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