Date: Thu, 18 Jun 2009 09:08:05 -0400 From: John Baldwin <jhb@freebsd.org> To: freebsd-current@freebsd.org Cc: Gavin Atkinson <gavin@freebsd.org> Subject: Re: BTX halted when booting from CD: Toshiba M10-10i laptop Message-ID: <200906180908.05274.jhb@freebsd.org> In-Reply-To: <1245258022.40309.49.camel@buffy.york.ac.uk> References: <1245258022.40309.49.camel@buffy.york.ac.uk>
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On Wednesday 17 June 2009 1:00:22 pm Gavin Atkinson wrote: > Hi all, > > I've got a new laptop (a Toshiba M10-10i, for the archives) but FreeBSD > won't boot on it. I've tested with the May 2009 amd64 snapshot ISO, and > about 20% of the time, it hangs before even displaying "CD loader". The > rest of the time, I get the following BTX register dump: > > CD Loader 1.2 > > Building the boot loader arguments > Looking up /BOOT/LOADER... Found > Relocating the loader and the BTX > Starting the BTX loader > > BTX loader 1.00 BTX version is 1.02 > > int=0000000d err=00003d58 efl=00010246 eip=3583d321 > eax=8b16d000 ebx=00000000 ecx=ffff0000 edx=00002170 > esi=00000000 edi=0003b7c0 ebp=00090bf8 esp=00090bc8 > cs=002b ds=0033 es=0033 fs=0033 gs=0033 ss=0033 > cs:eip=07 00 00 00 00 00 00 00-33 00 02 00 00 00 00 00 > 00 00 00 00 00 00 00 00-03 00 00 00 20 00 00 00 > ss:esp=5b 3d 03 00 33 00 00 00-48 01 00 00 a0 b0 03 00 > 38 00 00 00 6f 01 20 00-1a 00 20 00 01 94 00 00 > BTX halted > > (at which point the laptop immediately reboots. This is transcribed > from a photo.) > > A second crash (some registers are different, but I guess it's the same > cause due to the same odd eip): > > int=0000000d err=00003d58 efl=00010202 eip=3583d321 > eax=79f7b814 ebx=00000000 ecx=02000000 edx=000000ec > esi=00000000 edi=0003b7c0 ebp=00090bf8 esp=00090bcc > cs=002b ds=0033 es=0033 fs=0033 gs=0033 ss=0033 > cs:eip=07 00 00 00 00 00 00 00-33 00 02 00 00 00 00 00 > 00 00 00 00 00 00 00 00-03 00 00 00 20 00 00 00 > ss:esp=5b 3d 03 00 48 01 00 00-a0 b0 03 00 38 00 00 00 > 6f 01 20 00 1a 00 20 00-01 94 00 00 00 00 00 00 > BTX halted > > Now, I can tell that eip is off into the weeds, but I'm not really sure > how to debug this past that. The first address on the stack is > presumably a return address, but that doesn't seem to be within the > address space where any of the bootstrap code is loaded to, so maybe I'm > wrong. > > So, how do I continue tracking down the problem from here? > > I don't know if it helps at all, but even a 4.x CD dies in BTX (although > I haven't managed to successfully take a picture of that to confirm if > it is the same problem, but can try if it would be useful) > > As an aside, from what I understand from the source, once we've got to > this stage of the boot the environment should be the same whether we're > booting from hard drive, CD or PXE? Is that correct? My guess is that the data being read from the CD is corrupted somehow. If a 4.x CD fails too then that the breakage is solely in the BIOS as 4.x uses the old floppy emulation mode. -- John Baldwin
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