Messages in this thread |  | | | Date | Sun, 30 Dec 2007 18:39:27 +0000 | | From | Alan Cox <> | | Subject | Re: [PATCH] x86: provide a DMI based port 0x80 I/O delay override | |
On Sun, 30 Dec 2007 19:14:40 +0100
Rene Herman <rene.herman@keyaccess.nl> wrote:
> On 30-12-07 17:48, Alan Cox wrote:
>
> > For processors with TSC I think we should aim for 2.6.25 to do this and
> > to have the major other _p fixups done. I pity whoever does stuff like
> > the scc drivers but most of the rest isn't too bad.
>
> I'm by the way looking at drivers/net/wd.c which my 386 uses for its dual
> mode NE2000/WD8013 clone ISA NIC and while it specifically needs no delay at
> all it seems, the mixed use of out and outb_p seems to suggest that someone
> once thought about that. Would you advice sticking in a udelay(2) manually
> there?
I would need to dig out the documentation and NE2000 reference code if I
even still have them. From memory NE2K needs them but I don't know
offhand if the WD80x3 devices do, or if only some of them do. It'll also
depend on the port - the DPRAM is different to the 8390.
Don Becker wrote the drivers and at the time he tuned them carefully for
performance so I would expect delays to be the ones needed
Alan
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