pci configuration
Cagle, John (ISS-Houston)
john.cagle at hp.com
Tue Aug 12 20:00:31 PDT 2003
If you're using a server with the Compaq PCI-X Hot Plug controller, you
can read the maximum bus speed and current device speed from the hot
plug controller. For details, take a look at the
drivers/pci/hotplug/cpqphp.h and drivers/pci/hotplug/cpqphp_core.c files
in the latest Linux 2.6 kernel. Here are a couple links:
http://lxr.linux.no/source/drivers/pci/hotplug/cpqphp_core.c?v=2.6.0-tes
t2
http://lxr.linux.no/source/drivers/pci/hotplug/cpqphp.h?v=2.6.0-test2
Regards,
John
--------------------------------
John Cagle john.cagle at hp.com
Principal Member Technical Staff
Industry Standard Servers
Hewlett-Packard Company
> -----Original Message-----
> From: Scott Long [mailto:scottl at freebsd.org]
> Sent: Tuesday, August 12, 2003 8:55 PM
> To: Doug White
> Cc: freebsd-current at freebsd.org; Petri Helenius
> Subject: Re: pci configuration
>
>
> Doug White wrote:
> > On Tue, 12 Aug 2003, Petri Helenius wrote:
> >
> >
> >>Is there way to view PCI / PCI-X configuration with
> bus-width and clock
> >>values when FreeBSD has already booted?
> >
> >
> > If you know where in PCI config space to look you could use
> pciconf to
> > query it. Can't say I've heard of PCI speed negotiation
> issues, though.
> >
>
> I'm not aware of any registers in the standard PCI config space that
> will tell you the speed of the bus. Some PCI devices will make that
> information available, but not in a standard way. The BIOS of some
> higher-end systems might also tell you this information.
>
> Scott
>
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