Extend the documentation for kernel option pci=resource_alignment Some uio based PCI drivers (e.g. uio_cif) do not work if the assigned PCI memory resources are not page aligned. By using the kernel option "pci=resource_alignment" it is possible to force single PCI boards to use page alignment for their memory resources. However, this is fairly cumbersome if multiple of these boards are in use as the specification of the cards has to be done via PCI bus/slot/function number which might change e.g. by adding another board. This patch extends the kernel option "pci=resource_alignment" to allow to specify the relevant boards via PCI device/vendor (and subdevice/subvendor) ids. The specification of the devices via device/vendor is indicated by a leading string "pci:" as argument to "pci=resource_alignment". The format of the specification is pci:<vendor>:<device>[:<subvendor>:<subdevice>] Examples: pci=resource_alignment=4096@pci:1234:abcd:1234:bcde pci=resource_alignment=pci:1234:abcd Signed-off-by: Mathias Koehrer <mathias.koehrer@xxxxxxxx> --- pci/Documentation/kernel-parameters.txt | 3 +++ 1 file changed, 3 insertions(+) Index: linux-pci-git/pci/Documentation/kernel-parameters.txt =================================================================== --- linux-pci-git.orig/pci/Documentation/kernel-parameters.txt +++ linux-pci-git/pci/Documentation/kernel-parameters.txt @@ -3032,6 +3032,9 @@ bytes respectively. Such letter suffixes PAGE_SIZE is used as alignment. PCI-PCI bridge can be specified, if resource windows need to be expanded. + To specify the alignment for certain types of devices, the + PCI vendor/device (and subvendor/subdevice) may be + specified. E.g. 4096@pci:1234:abcd:1234:bcde ecrc= Enable/disable PCIe ECRC (transaction layer end-to-end CRC checking). bios: Use BIOS/firmware settings. This is the -- 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
