Date: Sun, 20 Jun 2010 16:12:30 -0400 From: Paul Mather <paul@gromit.dlib.vt.edu> To: freebsd-ppc@freebsd.org Subject: Re: 8.1-RC1 fails to boot on iBook G4 Message-ID: <375212BA-21BF-4E05-B138-BDC4349A8C21@gromit.dlib.vt.edu> In-Reply-To: <4C1E65A0.9030800@freebsd.org> References: <ACC43406-4175-40E5-A974-A72A54EF55E8@gromit.dlib.vt.edu> <4C1A253C.7040905@freebsd.org> <1D327CFF-291D-4AC1-89F4-24A689303475@gromit.dlib.vt.edu> <4C1E65A0.9030800@freebsd.org>
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On Jun 20, 2010, at 3:01 PM, Nathan Whitehorn wrote: > On 06/19/10 10:29, Paul Mather wrote: >> On Jun 17, 2010, at 9:38 AM, Nathan Whitehorn wrote: >>=20 >> =20 >>> On 06/16/10 21:13, Paul Mather wrote: >>> =20 >>>> I just tried to book the 8.1-RC1 disc1 ISO on an iBook G4 but it = failed to boot into FreeBSD. I was left at the Open Firmware prompt. = Is FreeBSD known not to work on an iBook G4? I was able to boot = successfully into the FreeBSD installer using this same disc on a = PowerBook G4. >>>>=20 >>>> =20 >>> That should work perfectly fine. I have a G4 iBook of the same model = running FreeBSD. >>>=20 >>> =20 >>>> Decrementer exception at %SRR0: 00100100 %SRR1: 10003030 >>>>=20 >>>> =20 >>> This is a very rare race during early initialization that happens on = some machines and that no one has been able to track down. A timer seems = to have gone off in the middle of the OF->kernel transition. It's = possible that if you wait a different amount of time at the boot prompt = it won't happen. >>> =20 >> I tried waiting a different amount of time during a couple of boot = attempts, but it made no difference. Some of the times I waited until = different points during the countdown to boot before pressing the return = key, and at least once I pressed space to go to the boot prompt and let = it sit there for a while before issuing "boot." Every time, it failed = to boot FreeBSD. >>=20 >> Almost always, I get the "Decrementer exception" error above, but = once I got something akin to a "Memory access error" reported, with the = same %SRR0 and %SRR1 values. I even reset the iBook's PRAM via = Command-Option-P-R, but to no avail. >> =20 > That's very strange -- 0x00100100 is the very first instruction in the = kernel, so it hasn't even had a chance to run yet. Maybe there is a = hardware problem with your CD drive? Can you check that the MD5 of the = disc matches the one on the FTP site when read from your iBook? The exact same disc will boot without issues on a PowerBook G4, so I = suspect the disc itself is okay. Today, I downloaded and burned the NetBSD/macppc 5.0.2 install ISO. I = was able to boot successfully into the NetBSD installer from Open = Firmware using that disc. So, I guess the CD hardware is probably okay, = and whatever the NetBSD boot loader is doing, it is able successfully to = boot on this iBook G4 whereas the FreeBSD one can't. Cheers, Paul.
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