Subject: Re: FDDI: PC/BIOS and MTU
To: Hal Murray <>
From: Manuel Bouyer <>
List: current-users
Date: 06/01/1999 11:34:28
On Tue, Jun 01, 1999 at 02:25:51AM -0700, Hal Murray wrote:
> Thanks.  I poked around and only found a per-bus flag rather than 
> one per board.

Maybe it was per-bus, I don't remember (and don't have the machine to check).
The fact is that it defaults to 'off', and I can't see any rationale for
this. This prevent most add-on boards from working.

> > The BIOS is supposed to turn it on, though some driver explicitely set the
> > bit to '1', just to be sure.
> I checked various drivers.  Most of them turn it on.  It looks like 
> the same chunk of code was copied around. 
> I was going to ask where that code was for the Tulip driver.  I couldn't 
> find it.  Suprise.  It doesn't work either.

I wonder if just tunring it on is enouth for all cases. I guess if the
chip is behind a pci-pci bridge which has not been configured for DMA it
will not work (but I may be wrong, I don't know PCI well enouth :)

Manuel Bouyer, LIP6, Universite Paris VI.