Date: Tue, 2 Sep 2014 01:14:44 -0700 From: Mark Millard <markmi@dsl-only.net> To: freebsd-ppc@freebsd.org Subject: A PowerMac G5 rarity: explicit fatal kernel trap (data storage interrupt) instead of Copyright notice and boot text Message-ID: <9D652449-59C8-4F95-98CF-1CD4AA1D6E88@dsl-only.net>
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On G5 PowerMac's (with lots of RAM) I frequently have boots that after clearing (going black) never display anything from where the Copyright notice should display on --and the fans gradually spin up indicating that it failed somehow. Rarely an error message shows up instead of the Copyright and later boot text. This happend today and I wrote the one generated down so that I could leave a note about it. I've no clue how to repeat it in any reasonable time frame. The text on screen was (not a copy of the detailed spacing): fatal kernel trap exception = 0x300 (data storage interrupt) virtual address = 0x2fb1948 dsisr = 0x40000000 srr0 = 0x88fa84 srr1 = 0x9000000000003030 lr = 0x8903e8 curthread = 0xd0ccc0 pid = 0, comm = Panic: data storage interrupt trap cpuid = 0 KDB: stack backtrace #0: 0x533d30 at ??+0 #1: 0x86346c at ??+0 #2: 0x864630 at ??+0 #3: 0x8595e0 at ??+0 Uptime: 1s If I interpret what I found about this correctly the dsisr value indicates that the data's address was not-found in primary or secondary "page table entry group"s (so a page fault occurred that was not expected to need to be handled): indicated by DSISR[1] = '1'... > Set if MSR[DR] = ’1’ and the translation for an attempted access is not found in the primary page table entry group (PTEG), or in the secondary PTEG (page fault condition); otherwise cleared. Context: FreeBSD FBSDG5S0 10.0-STABLE FreeBSD 10.0-STABLE #0 r268571: Sun Jul 13 06:28:19 UTC 2014 root@grind.freebsd.org:/usr/obj/powerpc.powerpc64/usr/src/sys/GENERIC64 powerpc === Mark Millard markmi at dsl-only.nethelp
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