On 01/24/2015 12:01 AM, Finn Thain wrote: > That's a very early crash. It could be caused by a NuBus slot interrupt > being asserted, since these are non-maskable IRQs on some models. This can > happen with SONIC ethernet, prior to the Linux macsonic driver being > loaded. > > Try booting MacOS with no extensions loaded (hold down shift key when you > hear the boot chime, and release it when you see the words "Extensions > disabled").
Ok, I will give that a try next week. The Mac is located in my office and I am not going to work over the weekend :). I would actually buy a serial cable to help with the debugging. Is there any particular cable that you can recommend? > If this really is a regression, since 3.14, an obvious suspect would be my > earlyprintk patch, commit 7913ad1ad834, which appeared in 3.16. But this > crash looks to be too early. I would be happy to try a kernel with that patch reverted if you want to provide one. >>> You might want to order a 16.666 MHz crystal as well, in case of >>> instability at 40Mhz. >> >> Good idea! > > I've been there myself. I once clock chipped a PowerBook 520 CPU board. I > desoldered the SMT 68LC040 CPU and replaced it with a 68040, and replaced > the crystal at the same time. It worked, but the extra transistors and the > extra frequency generated far too much heat for the passively cooled > laptop to deal with. It needed a high-efficiency cooling system from a > modern laptop, but there's no room for that. Ouch :). >>> The Quadra 650 (33 MHz) has a big heat sink on the CPU; I don't recall >>> seeing one on the slower machines. >> >> The Centris 650 has a big heat sink as well which is why the guys from >> the clockchipping website claimed overclocking them wouldn't be an issue >> at all... > > Fair enough. I wonder if you need heat sinks on other chips -- who knows > what clock lines could be affected by that crystal. The website I linked earlier actually provides lots of statistics on the topic [1]. Lots of users contributed reports at which clock rates their Macs would still run stable. Adrian > [1] http://www.applefool.com/clockchipping/ -- .''`. John Paul Adrian Glaubitz : :' : Debian Developer - [email protected] `. `' Freie Universitaet Berlin - [email protected] `- GPG: 62FF 8A75 84E0 2956 9546 0006 7426 3B37 F5B5 F913 -- To UNSUBSCRIBE, email to [email protected] with a subject of "unsubscribe". Trouble? Contact [email protected] Archive: https://lists.debian.org/[email protected]
