On Wed, Apr 27, 2011 at 4:33 AM, Germán Sanchis <eaglecros@xxxxxxxxx> wrote: > 2011/4/25 Dominik Brodowski <linux@xxxxxxxxxxxxxxxxxxxx>: >> Hey, >> >> thanks for the additional debug information. It seems to me to be not a >> bug with the yenta driver, but with the parent PCI bridge instead. >> Therefore, I've added Jesse and the linux-pci list as recipients. Germán's >> problem relates to Ubuntu's 2.6.35-derived kernel; lspci snippets follow. >> >> Let's look at the (grand-)parent bridge: It offers some, if not much I/O and >> memory resources for its childs to be used: >> >> 00:1c.5 PCI bridge: Intel Corporation 82801I (ICH9 Family) PCI Express Port 6 (rev 03) (prog-if 00 [Normal decode]) >> 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 >> Bus: primary=00, secondary=04, subordinate=09, sec-latency=0 >> I/O behind bridge: 00001000-00001fff >> Memory behind bridge: d6100000-d70fffff >> Prefetchable memory behind bridge: 00000000d5100000-00000000d60fffff >> >> The PCI bridge, however, does only pass the I/O resources downstream, but >> _no_ memory at all. >> >> 04:00.0 PCI bridge: Texas Instruments XIO2000(A)/XIO2200(A) PCI Express-to-PCI Bridge (rev 03) (prog-if 00 [Normal decode]) >> 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 >> Bus: primary=04, secondary=05, subordinate=09, sec-latency=0 >> I/O behind bridge: 00001000-00001fff >> Memory behind bridge: fff00000-000fffff >> >> The CardBus bridge then has I/O resources to use, but cannot enable memory >> resources: >> >> 05:00.0 CardBus bridge: Texas Instruments PCIxx12 Cardbus Controller >> Memory window 0: 00000000-00000000 [disabled] (prefetchable) >> Memory window 1: 00000000-00000000 [disabled] (prefetchable) >> I/O window 0: 00001000-000010ff >> I/O window 1: 00001400-000014ff >> >> So my question to the PCI folks: why does the PCI bridge fail to pass memory >> regions downstream, and assign them properly to the CardBus bridge? The BIOS assigned [mem 0xd6100000-0xd70fffff] (16MB) and [mem 0xd5100000-0xd60fffff 64bit pref] (16MB) to bus 04, but left the 04:00.0 bridge windows to bus 05 disabled. Linux only enables them if we find a downstream device that needs resources. In this case, there *is* a downstream CardBus bridge (05:00.0) that would like resources. By default, pci_bus_size_cardbus() requests 64MB for each CardBus memory window, but there's only 16MB each (prefetchable and non-prefetchable) available. I don't think your audio card needs anywhere near 64MB of memory space. Can you try booting with "pci=cbmemsize=8M"? Bjorn -- To unsubscribe from this list: send the line "unsubscribe linux-pci" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
