Date: Tue, 8 Jul 2008 19:41:53 +0200 From: "Philip Schulz" <philip.s.schulz@googlemail.com> To: ross@grinz.com Cc: freebsd-ppc@freebsd.org Subject: Re: CD boot fails (Decrementer exception) Message-ID: <1c66db910807081041n4f58a5b8rf083ed65b61ed79a@mail.gmail.com> In-Reply-To: <50246.166.214.185.147.1215527482.squirrel@grinzport.grinz.com>
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2008/7/8 Ross Gohlke <ross@grinz.com>: > I am finally getting around to the Xserve installation I asked about > previously: > FreeBSD 7.0-RELEASE installer CD (burned on an iBook a month ago) > Xserve G4 Dual 1GHz > Following these instructions: > http://people.freebsd.org/~grehan/iso_install.txt > > Boot holding down 'c' does not work. > Boot into Open Firmware (hold down Cmd-Opt-o-f) and issue: > 0 > boot cd:,\boot\loader cd:0 > > OF finishes loading, then reports: > Decrementer exception at %SRR0: 0035fc04 %SRR1: 00002032 > ok > 0 > > Does the loader start at all? I haven't experienced the issue myself, but I think what happens is that Open Firmware enables interrupts before the kernel has a chance to install its own exception handlers. I have seen reports that the exception occurs both on NetBSD and OpenBSD. The latter seems to have added a workaround: They set the decrementer register to a very high value, very early in the boot process (possibly even in their loader). You can accomplish the same from Open Firmware: > 1 1f lshift not dec! This should set the decrementer register to 0x7fffffff which is the highest possible value. This should give you enough time to execute the loader and start the kernel. You could also try and start the kernel directly, without the loader. HTH, Philiphome | help
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