Messages in this thread | | | Date | Tue, 18 Aug 2009 01:59:31 +0300 | From | Faidon Liambotis <> | Subject | Re: [regression, bisected] fails to boot on Dell Optiplex 760 with VT-d enabled |
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David Woodhouse wrote: > On Mon, 2009-08-17 at 14:27 -0700, Faidon Liambotis wrote: >> I am experiencin a bug on an Dell Optiplex 760 with a configuration that >> has an Intel Core2 Q9550 CPU and with an up-to-date BIOS, version A03. >> >> When "VT for Direct I/O" is enabled in the BIOS, v2.6.30 boots and works >> perfectly, while v2.6.31-rc1..rc6 fail (both of them x86-64). >> >> More specifically, I get an endless loop of printing the following >> messages in >> the screen: >> DMAR: [DMA Read] Request device [ff:1f.7] fault addr >> fffffffffffff000 >> DMAR: [fault reason 255] Unknown >> and the boot process doesn't move on from there. > > Is it fixed by http://git.infradead.org/iommu-2.6.git/commit/0815565a ? Yes it is (v2.6.31-rc6 with 0815565a cherry-picked). Thanks! Should I expect this to reach v2.6.31?
> I strongly suspect you weren't actually using the IOMMU in your > 'working' 2.6.30 kernel? Can you show a full log of that one booting? Could easily be the case, as I said, I haven't tested it (and have absolutely no idea how to). Full log is attached. Excerpt for your convienience: --- DMAR:Host address width 36 DMAR:DRHD (flags: 0x00000000)base: 0x00000000fedc1000 DMAR:DRHD (flags: 0x00000000)base: 0x00000000fedc2000 DMAR:DRHD (flags: 0x00000000)base: 0x00000000fedc3000 DMAR:DRHD (flags: 0x00000001)base: 0x00000000fedc4000 DMAR:RMRR base: 0x00000000cda58000 end: 0x00000000cda6ffff DMAR:RMRR base: 0x00000000cdc00000 end: 0x00000000cfffffff Not all IO-APIC's listed under remapping hardware ---
If it's a BIOS issue, any ideas on who to contact at Dell for this?
Thanks, Faidon
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