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    SubjectRe: [PATCH] PCI legacy resource fix
    On Fri, Dec 08, 2006 at 07:46:18PM -0500, Ben Collins wrote:

    > On Wed, 2006-12-06 at 13:41 +0000, Ralf Baechle wrote:
    > > Since commit 368c73d4f689dae0807d0a2aa74c61fd2b9b075f the kernel will try
    > > to update the non-writeable BAR registers 0..3 of PIIX4 IDE adapters if
    > > pci_assign_unassigned_resources() is used to do full resource assignment
    > > of the bus. This fails because in the PIIX4 these BAR registers have
    > > implicitly assumed values and read back as zero; it used to work because
    > > the kernel used to just write zero to that register the read back value
    > > did match what was written.
    > >
    > > The fix is a new resource flag IORESOURCE_PCI_FIXED used to mark a
    > > resource as non-movable. This will also be useful to keep other import
    > > system resources from being moved around - for example system consoles
    > > on PCI busses.
    > I have a problem where an ich6 (SATA+PATA) is getting its port0 reserved
    > by the pci quirk for libata so that it gets picked up by ata_piix. In
    > current git, ata_piix complains:
    > [ 124.507570] PCI: Unable to reserve I/O region #1:8@1f0 for device 0000:00:1f.2
    > I bisected to the same commit, 368c73d4f689dae0807d0a2aa74c61fd2b9b075f,
    > however, your patch doesn't fix my problem.

    Looks like a double reservation. My patch doesn't deal with reservations
    at all. I thought about resource reservations but decieded that should
    be dealt with elsewhere.

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