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    SubjectRe: [PATCH] I/O space boot parameter
    On Tue, Mar 20, 2007 at 12:18:24PM -0400, Daniel Yeisley wrote:
    > It has been mentioned before that large systems with a lot of PCI buses
    > have issues with the 64k I/O space limit. The ES7000 has a BIOS option
    > to either assign I/O space to all adapters, or only to those that need
    > it. A list of supported adapters that don't need it is kept in the
    > BIOS. When this option is used, the kernel sees the BARs on the
    > adapters and still tries to assign I/O space (until it runs out). I've
    > written a patch to implement a boot parameter that tells the kernel not
    > to assign I/O space if the BIOS hasn't.

    How prelevant are machines like this? And why are the BARs on these
    devices wrong?

    > Signed-off-by: Dan Yeisley <dan.yeisley@unisys.com>
    > ---
    >
    > diff -Naur linux-2.6.20-org/Documentation/kernel-parameters.txt linux-2.6.20-new/Documentation/kernel-parameters.txt
    > --- linux-2.6.20-org/Documentation/kernel-parameters.txt 2007-02-04 13:44:54.000000000 -0500
    > +++ linux-2.6.20-new/Documentation/kernel-parameters.txt 2007-03-05 21:35:15.000000000 -0500
    > @@ -1259,6 +1259,7 @@
    > This sorting is done to get a device
    > order compatible with older (<= 2.4) kernels.
    > nobfsort Don't sort PCI devices into breadth-first order.
    > + noiospace Do not allocate I/O space unless the BIOS has done so.
    >
    > pcmv= [HW,PCMCIA] BadgePAD 4
    >
    > diff -Naur linux-2.6.20-org/drivers/pci/pci.c linux-2.6.20-new/drivers/pci/pci.c
    > --- linux-2.6.20-org/drivers/pci/pci.c 2007-02-04 13:44:54.000000000 -0500
    > +++ linux-2.6.20-new/drivers/pci/pci.c 2007-03-06 00:58:52.000000000 -0500
    > @@ -20,6 +20,7 @@
    > #include "pci.h"
    >
    > unsigned int pci_pm_d3_delay = 10;
    > +unsigned int noiospace = 0;

    pci_no_iospace perhaps? "noiospace" isn't the best named global
    variable...

    thanks,

    greg k-h
    -
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