Messages in this thread | | | Date | Thu, 24 Feb 2005 17:34:28 -0500 | From | Brian Gerst <> | Subject | Re: 64-bit pci bar on a 32-bit kernel |
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Terence Ripperda wrote: > Hello, > > we've gotten a customer report of a problem whereby our framebuffer is > not visible through the kernel. the kernel data structures in struct > pci_dev have bar1 (our framebuffer) set to 0, and the bar does not > appear in /proc/pci. > > after a little investigation, it appears that the bios allocated a > 64-bit bar in pci config space. our gpu claims 64-bit support in pci > config space and the cpu is an em64t. but the customer is running a > 32-bit kernel on the em64t, which is a reasonable thing to do. it > turns out the pci driver does not like 64-bit bars on a 32-bit kernel > and prints out the following messages during boot: > > PCI: PCI BIOS revision 2.10 entry at 0xf0031, last bus=5 > PCI: Using configuration type 1 > PCI: Probing PCI hardware > PCI: Probing PCI hardware (bus 00) > PCI: Ignoring BAR0-3 of IDE controller 00:1f.1 > PCI: Unable to handle 64-bit address space for > PCI: Unable to handle 64-bit address space for > PCI: Unable to handle 64-bit address for device 03:00.0 > PCI: Unable to handle 64-bit address space for > > Is this an expected problem? Is there any reason why the 32-bit kernel > couldn't handle 64-bit bars? > > here's what pci config space for our gpu looks like: > > 00: de 10 ce 00 07 01 10 00 a2 00 00 03 10 00 00 00 > 10: 00 00 00 de 0c 00 00 f8 0f 00 00 00 04 00 00 dd > 20: 00 00 00 00 00 00 00 00 00 00 00 00 de 10 43 02 > 30: 00 00 ee df 60 00 00 00 00 00 00 00 0a 01 00 00 > > Thanks, > Terence > > - > To unsubscribe from this list: send the line "unsubscribe linux-kernel" in > the body of a message to majordomo@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html > Please read the FAQ at http://www.tux.org/lkml/ >
It looks like support for 64-bit struct resouce is being worked on in the -mm tree.
-- Brian Gerst - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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