Re: [Pcihpd-discuss] Re: ACPI problem with PCI Express Native Hot-plug driver

From: Rajesh Shah (rajesh.shah_at_intel.com)
Date: 09/30/05

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    Date:	Fri, 30 Sep 2005 13:24:41 -0700
To: Rajat Jain <rajat.noida.india@gmail.com>

    On Fri, Sep 30, 2005 at 02:57:07PM +0900, Rajat Jain wrote:
    >
    > pciehp: pfar:cannot locate acpi bridge of PCI 0xb.
    > ......
    > pciehp: pfar:cannot locate acpi bridge of PCI 0xe.

    This is saying that the driver's probe function was called for
    these pciehp capable bridges, but it didn't find them in the
    ACPI namespace.

    >
    > I am not sure where the problem lies. But the fact that the entries
    > are appearing correctly when I disable ACPI, combined with above error
    > messages, I suspect that there is a problem with ACPI namespace
    > (probably the resources cannot be found using ACPI).
    >
    At init time, the pciehp driver scans the ACPI namespace and tries
    to collect resources for all bridges - host as well as PCI. It's
    pretty rare for BIOS to describe PCI bridge resources in ACPI
    namespace, so that's not unusual. What's unexpected is that these
    pciehp bridges weren't even listed in the namespace.

    With the pciehp version that has acpi disabled, it's not going to
    try to get bridge resources and other information from acpi. In
    that case, it simply reads the bridge config space to determine
    resource ranges it is decoding. This is what the acpi version of
    pciehp also defaults to for PCI bridges that are listed without
    resource descriptions in the acpi namespace. So, the error you
    are running into is somewhat bogus. The proper long term fix
    is to change pciehp to not depend so much on acpi and just use
    the pci core for resource management. In the meantime, you should
    just use the non-acpi version of pciehp.

    Rajesh

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