Problems with tulip 0.89K p-to-p and simplex link questions

[Sam Mosel]

Michael wrote:
> 
> On Thu, 24 Sep 1998, Sam Mosel wrote:
> 
> > Greetings,
> >
> > Here's something to get your teeth into...
> >
> > I have 2 machines direct connected via secondary NICs. The NICs are
> > Digital DE-500-FA 100Mbps Fibre cards. They have a separate fibre for
> > Tx & Rx, and I have them crossed over. These are of course tulip cards.
> >
> 
> Sam..
> 
> How long are your fiber jumpers (patch cords I'll assume)??
> You may know this but there is a thing called a sunburst effect that
> ocures on short fiber runs (or so I've been told). I've been told
> 9 foot is the shortest you should run. I've used 12 foot to be
> safe..
> 

About 300mm :). I can easily try it with some 10m cables... Tried it, no difference.

> Your problem may indeed be driver related but I thought I'ed throw
> this little piece of info out.
> 
> Michael

Incidentally, I got the duplex (crossed fibres) to work with the following driver change:

--- tulip-0.89K.c       Fri Sep 25 08:14:54 1998
+++ tulip-0.89K-nonway.c        Fri Sep 25 12:24:22 1998
@@ -306,8 +306,8 @@
   { "Digital DC21041 Tulip", 128, 0x0001ebef, HAS_MEDIA_TABLE, tulip_timer },
   { "Digital DS21140 Tulip", 128, 0x0001ebef,
        HAS_MII | HAS_MEDIA_TABLE | CSR12_IN_SROM, tulip_timer },
-  { "Digital DS21143 Tulip", 128, 0x0801fbff,
-       HAS_MII | HAS_MEDIA_TABLE | ALWAYS_CHECK_MII | HAS_ACPI, t21142_timer },
+  { "Digital DS21143 Tulip", 128, 0x0001ebef,
+    HAS_MEDIA_TABLE | HAS_ACPI, tulip_timer },
   { "Lite-On 82c168 PNIC", 256, 0x0001ebef,
        HAS_MII, pnic_timer },
   { "Macronix 98713 PMAC", 128, 0x0001ebef,


Still no luck with the simplex mode, although I suspect I'll have to mod the values that
the eeprom is supplying for some of the CSRs. Now just a matter of slogging therough the
doco and finding out which ones...

-- 
Regards,

Sam.

(samm at
vsl dot
com dot au)

Senior Software Engineer,
Vision Abell Pty. Ltd.
http://www.vsl.com.au/abell/

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