lkml.org 
[lkml]   [2007]   [Jan]   [26]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    /
    Date
    SubjectRe: Bugfixes: PCI devices get assigned redundant IRQs
    From
    On Fri, 26 Jan 2007 12:00:55 +0100, Xavier Bestel <xavier.bestel@free.fr>  
    wrote:
    > On Fri, 2007-01-26 at 11:50 +0100, Andreas Block wrote:
    >
    >> u8 pin, slot;
    >> - int irq;
    >> + int irq = 0;
    >
    > Aren't there platforms for which irq = 0 is a valid irq ?

    As far as I understand the PCI spec, the answer to your question seems to
    be: no
    (or I'm missing something).

    Don't get me wrong. I'm not talking about system IRQs, but about the value
    of the Interrupt Pin Register in PCI configuration space.

    The PCI Local Bus Specification in Revision 3.0 from 3rd February 2004
    says on page 223 about the content of Interrupt Pin register:

    Value 0x00: _No_ interrupt
    Values 0x01 to 0x04: Interrupt lines A to D
    And values 5 to 0xFF are reserved.

    So I'd say, the "correction" of greater values than four to a value of one
    seems discussable, too. Because it will break any future changes of the
    PCI spec.

    Andreas

    --
    -------------------------------------------------------------------------

    _/_/_/_/ Andreas Block
    _/_/_/_/ Dipl.-Ing.
    _/_/_/_/ andreas.block@esd-electronics.com

    _/_/_/ _/_/_/_/_/_/_/ esd electronic system design gmbh
    _/ _/ _/ _/ Vahrenwalder Str. 207
    _/ _/ _/_/_/ _/ _/ D-30165 Hannover
    _/ _/ _/ _/ Phone: +49-511-37298-0
    _/_/_/_/_/_/_/ _/_/_/ Fax: +49-511-37298-68
    http://www.esd-electronics.com

    -------------------------------------------------------------------------

    -
    To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
    the body of a message to majordomo@vger.kernel.org
    More majordomo info at http://vger.kernel.org/majordomo-info.html
    Please read the FAQ at http://www.tux.org/lkml/

    \
     
     \ /
      Last update: 2007-01-26 14:07    [W:0.023 / U:88.564 seconds]
    ©2003-2016 Jasper Spaans. hosted at Digital OceanAdvertise on this site