On Wed, Nov 18, 2015 at 8:12 AM, Daniel Stone <daniel@xxxxxxxxxxxxx> wrote: > Hi, > > On 18 November 2015 at 15:59, Andy Lutomirski <luto@xxxxxxxxxxxxxx> wrote: >> On Wed, Nov 18, 2015 at 2:59 AM, Ville Syrjälä >> <ville.syrjala@xxxxxxxxxxxxxxx> wrote: >>> On Tue, Nov 17, 2015 at 11:43:25AM -0800, Andy Lutomirski wrote: >>>> Typing: >>>> >>>> # cat /sys/devices/pci0000:00/0000:00:02.0/rom >>>> >>>> Provokes: >>>> >>>> i915 0000:00:02.0: Invalid ROM contents >>> >>> Hmm. So there's no PCI option ROM there. I wonder what is there. I >>> get the same on my Braswell BTW. I tried to look through the UEFI >>> spec a bit, and it seems to say that even for non-legacy option ROMs >>> the 0x55aa signature should be there. >>> >>> But this being the GPU means we may be using the shadow ROM stuff, >>> which IIRC assumes that the shadow is at 0xc000. I'm not sure that >>> holds anymore with UEFI, and maybe we should be using some UEFI >>> trick instead to find out where it actually lives? >>> >>> BTW what does 'lspci -vv -s 00:02.0' say on your machine? >>> >> >> 00:02.0 VGA compatible controller: Intel Corporation Sky Lake >> Integrated Graphics (rev 07) (prog-if 00 [VGA controller]) >> DeviceName: Onboard IGD >> Subsystem: Dell Device 0704 >> Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- >> ParErr- Stepping- SERR- FastB2B- DisINTx+ >> Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- >> <TAbort- <MAbort- >SERR- <PERR- INTx- >> Latency: 0 >> Interrupt: pin A routed to IRQ 128 >> Region 0: Memory at db000000 (64-bit, non-prefetchable) [size=16M] >> Region 2: Memory at 90000000 (64-bit, prefetchable) [size=256M] >> Region 4: I/O ports at f000 [size=64] >> Expansion ROM at <unassigned> [disabled] > > UEFI has an option to enable option ROMs, which is disabled by > default; I wonder if having it disabled prevents all access to the > ROM. > > Mind you, it doesn't seem to be fatal; I've not had any issues with > the same machine that I can pin down to lack of ROM. > FWIW, my logs also get spammed with: [ 127.101881] i915 0000:00:02.0: BAR 6: [??? 0x00000000 flags 0x2] has bogus alignment I suspect that the PCI core is just failing to recognize that the ROM is disabled. --Andy _______________________________________________ Intel-gfx mailing list Intel-gfx@xxxxxxxxxxxxxxxxxxxxx http://lists.freedesktop.org/mailman/listinfo/intel-gfx
