Hi Greg, thanks for the response. > > 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 cards are in use. > > This patch adds another kernel option "pci=resources_page_aligned" > > that allows to set the default alignment of PCI memory resources to be > > page aligned. > > Overwriting of this default alignment via "pci=resource_alignment" is > > still possible. > > This seems like a very large hammer for a very specific problem with a card > that seems to be not-in-spec (I can't find anywhere that requires resources to > be "page" aligned in the PCI spec). Why not fix the firmware in these cards? The issue is not the firmware. The issue is that the Linux uio driver (here: uio_cif) does not work as uio_mmap() -> uio_mmap_physical() does not do a mmap on physical memory that is not page aligned... Regards Mathias -- 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
