Messages in this thread | | | Date | Thu, 05 Apr 2001 09:15:17 +0200 | From | Carsten Langgaard <> | Subject | Re: pcnet32 (maybe more) hosed in 2.4.3 |
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Thomas Bogendoerfer wrote:
> 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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