Re: Exposing ROM's though sysfs

From: Jon Smirl (jonsmirl_at_yahoo.com)
Date: 07/30/04

  • Next message: Matthew Wilcox: "Re: Exposing ROM's though sysfs" 
    Date:	Fri, 30 Jul 2004 11:59:21 -0700 (PDT)
To: Matthew Wilcox <willy@debian.org>, Jesse Barnes <jbarnes@engr.sgi.com>

    --- Matthew Wilcox <willy@debian.org> wrote:
    > My problem is with this is the following passage from PCI 2.2 and PCI
    > 2.3:
    >
    > In order to minimize the number of address decoders needed, a
    > device may share a decoder between the Expansion ROM Base Address
    > register and other Base Address registers. When expansion ROM decode
    > is enabled, the decoder is used for accesses to the expansion ROM
    > and device independent software must not access the device through
    > any other Base Address registers.

    Alan Cox knows more about this, but I believe there is only one PCI
    card in existence that does this.

    For the one or two cards that do this, the device drivers could flag
    this to the PCI subsystem. In the flagged case the sysfs read code
    could shut off interrupts, enable the ROM, copy it, and then reenable
    interrupts.

    =====
    Jon Smirl
    jonsmirl@yahoo.com

                    
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  • Next message: Matthew Wilcox: "Re: Exposing ROM's though sysfs"