> On Wed, Apr 04, 2001 at 01:14:16PM -0700, Petr Vandrovec wrote:
> > VMware is working on implementation PCnet 32bit mode in emulation (there
> > is no such thing now because of no OS except FreeBSD needs it). But
> > my question is - is there some real benefit in running chip in
> > 32bit mode?
>
> probably not.
In some 32bit bigendian systems you need to do address-swapping before doing any
16 bit (or 8 bit) PCI accesses, whereas 32 bit (full bus width) doesn't need any
swapping, and therefor it would be more efficient.
>
> > so is 32bit mode needed for bigendian ports, or what's reasoning
> > behind it?
>
> I've added 32bit mode for some IBM PowerPC machines. The firmware
> on this machines setup the chip to DWIO and I haven't found a way
> to switch it back to WIO.
I got the same issue on one of my platforms, the firmware setup the chip to DWIO
and the only thing that will bring it back to WIO is a hardware reset.
>
>
> Thomas.
>
> --
> Crap can work. Given enough thrust pigs will fly, but it's not necessary a
> good idea. [ Alexander Viro on linux-kernel ]
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