On Nov 22, 2011, at 10:26 AM, John Baldwin <j...@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. JN _______________________________________________ freebsd-current@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-current To unsubscribe, send any mail to "freebsd-current-unsubscr...@freebsd.org"
