Re: Opterons and setting the pci bus master bit

From: Alan Cox (alan_at_lxorguk.ukuu.org.uk)
Date: 09/30/05

  • Next message: Arjan van de Ven: "RE: I request inclusion of SAS Transport Layer and AIC-94xx into the kernel" 
    To: markh@compro.net
Date:	Fri, 30 Sep 2005 19:19:02 +0100

    On Gwe, 2005-09-30 at 13:10 -0400, Mark Hounschell wrote:
    > everything is fine. When we connect the same chassis to an Intel P4 box
    > everything is fine. It looks like it is the kernel that sets this bit
    > because we have never set it in any of our drivers, yet on the intel
    > boxes it gets set. Why would this bit not be set when the chassis is
    > connected to an Opteron. We are running 32-bit mode BTW. I am using a
    > 2.6.11.9 kernel. Is this a motherboard problem or could this be a kernel
    > problem?

    If your device needs to bus master you need to call
    pci_set_master(pci_dev). The bus mastering setup prior to that really
    depends on the BIOS and phase of the moon.

    See Documentation/pci.txt

    Alan

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  • Next message: Arjan van de Ven: "RE: I request inclusion of SAS Transport Layer and AIC-94xx into the kernel"

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