Re: PCI-X support

["Richard B. Johnson" <linux-os@analogic.com>]

On Fri, 1 Jul 2005, christos gentsis wrote:

> Richard B. Johnson wrote:
>
> > On Fri, 1 Jul 2005, christos gentsis wrote:
> >
> > > Hello
> > >
> > > I have a friend that his Msc project is related with the development
> > > over a PCI-X card. the problem is that he do not know if the Linux
> > > kernel support the PCI-X bus. i try to find something related with the
> > > PCI-X in the kernel source but i didn't found any file or folder with a
> > > relevant name... Does any one know if PCI-X bus supported from Linux and
> > > if no how can he patch the kernel to support it...?
> > >
> > > Thanks
> > > Chris
> >
> >
> > Sure PCI-X is just PCI/66 with 64-bits. It's just like PCI/66
> > from a software standpoint.
> >
> >
> > Cheers,
> > Dick Johnson
> > Penguin : Linux version 2.6.12 on an i686 machine (5537.79 BogoMips).
> >  Notice : All mail here is now cached for review by Dictator Bush.
> >                  98.36% of all statistics are fiction.
> so this practically means that hi will plug the card in, install Linux
> and the card will work correctly? because normal PCI i think that is
> 32-bit... does the same driver will provide full support?

The driver (whatever that is), if it was written for a 64-bit
platform, can write a 64-bit word in one operation and it's
transparent. If the driver was written for a 32-bit environment,
it will still work because there is compatibility with PCI 2.x

FYI, this machine has a PCI-X bus. I have some 32-bit cards
plugged into it (SCSI controller, etc.). They work. I also
have a 64-bit card plugged into it (fiber-optic data link).
It also works, but at 133 MHz. Software never talks to it
in 'long longs' so the increased data-width isn't being used.

Warning!  Many 5-volt cards may not work on the PCI-X bus.


Cheers,
Dick Johnson
Penguin : Linux version 2.6.12 on an i686 machine (5537.79 BogoMips).
 Notice : All mail here is now cached for review by Dictator Bush.
                 98.36% of all statistics are fiction.
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