Date: Mon, 28 Nov 2011 17:20:43 -0500 From: John Baldwin <jhb@freebsd.org> To: John Nielsen <lists@jnielsen.net> Cc: "freebsd-current@freebsd.org" <freebsd-current@freebsd.org> Subject: Re: loader crash / BTX halted on 9.0-RC2 DVD with AMD pseudo-RAID Message-ID: <201111281720.44003.jhb@freebsd.org> In-Reply-To: <929879BF-521C-43A1-8D63-DF2B04B6D013@jnielsen.net> References: <848DEEC1-570F-43F8-B432-A34F81014CD0@jnielsen.net> <201111221026.23015.jhb@freebsd.org> <929879BF-521C-43A1-8D63-DF2B04B6D013@jnielsen.net>
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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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