On 2014/7/24 15:30, John Fadel wrote: > I already tried pci=nocrs and I have exactly the same behaviour .. > > Is there any way to extend this range after linux is up ? > How can I access _CRS method to extend this range ? > Is there a way to force larger range during the boot of linux ? > First you should guarantee the extend resource range is free in your system, you can check this from cat /proc/iomem; Then if you add the pci=nocrs and still fail to use the extend resource range, this is not a OS problem, and maybe BIOS does not allow OS to use extend resource out of default hostbridge window. There is no other way to extend the _CRS from OS. Thanks! Yijing. > > > > On Thu, Jul 24, 2014 at 9:14 AM, Yijing Wang <wangyijing@xxxxxxxxxx <mailto:wangyijing@xxxxxxxxxx>> wrote: > > On 2014/7/24 14:35, John wrote: > > Hi > > I am trying to write a PCIe linux device driver to handle PCIe switches and > > endpoints that show up after the Redhat 6.4 linux is already up and running. > > > > If I try to allocate the resources of the PCIe switches & endpoints between > > 0xF4000000 and 0xF47FFFFF everything works fine .. But this range is quite > > full with other devices, so I tried to extend this range to start from > > 0xF0000000, or from 0xD0000000 the allocation works fine, but I am unable to > > access devices in the extended range > > > > Anybody has idea why I am unable to use the complete 3G - 4G address range ? > > Is it related to some ACPI boot configuration that need to be changed, I can > > see in my dmesg > > > > pci_root PNP0A08:00: host bridge window [mem 0xf4000000-0xf7ffffff] > > pci_root PNP0A08:00: host bridge window [io 0x1000-0x7fff] > > pci_root PNP0A08:00: host bridge window [io 0x0000-0x03af] > > pci_root PNP0A08:00: host bridge window [io 0x03e0-0x0cf7] > > pci_root PNP0A08:00: host bridge window [io 0x0d00-0x0fff] > > pci_root PNP0A08:00: host bridge window [mem 0xfed00000-0xfed03fff] > > pci_root PNP0A08:00: host bridge window [mem 0xfed40000-0xfed44fff] > > pci_root PNP0A08:00: host bridge window [io 0x03b0-0x03bb] > > pci_root PNP0A08:00: host bridge window [io 0x03c0-0x03df] > > pci_root PNP0A08:00: host bridge window [mem 0x000a0000-0x000bffff] > > pci_root PNP0A08:01: host bridge window [mem 0xf8000000-0xfbffffff] > > pci_root PNP0A08:01: host bridge window [io 0x8000-0xffff] > > > > Is there a reason for this limited range ? Is it processor dependant ? > > Yes, you should use the resource range in host bridge window, or you won't > request resource success. PCI hostbridge retrieve the host bridge window > from ACPI _CRS method, if _CRS is not exist, PCI may use global resource > iomem_resource and ioport_resource as its hostbridge window. > > BIOS is responsible for the _CRS resource range report. > > BTW, you can append the pci=nocrs in command line and try again. > > > Thanks! > Yijing. > > > > > > Thanks > > > > -- > > To unsubscribe from this list: send the line "unsubscribe linux-pci" in > > the body of a message to majordomo@xxxxxxxxxxxxxxx <mailto:majordomo@xxxxxxxxxxxxxxx> > > More majordomo info at http://vger.kernel.org/majordomo-info.html > > > > > > > -- > Thanks! > Yijing > > -- Thanks! Yijing -- 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
