Subject: DECchip 21143 and the tlp driver.
To: None <>
From: Brad Spencer <>
List: current-users
Date: 10/28/1999 23:00:30
I have a 4 port D-LINK ethernet card, model DFE-570TX.  This card has 4
21143 ethernet chips on it.  I have some of questions that I am hoping
that someone can answer:

1) The tlp driver appears to have some support for the 21142 chip and
perhaps some 21143 support, however, that driver complains that it can't
handle my card.  The last thing printed was a line something like:

	DECchip 21143 Ethernet, pass 4.1

I suspect that it might not be too bad to get this working, but it is
unclear to me what is required.  [before I started I made sure I had
'options TLP_MATCH_ ...' in my kernel config.  I have another machine with
a 21041 in it and the tlp driver works great there].

2) Falling back on the de driver...  I have a 10/100 ethernet switch that
can do full duplex and the auto probe finds that it is connected to a
100Mbits full duplex port, as expected.  However, it appears that an
output error is generated [or at least recorded] for every every packet
sent down the wire.  Slightly annoying, but I don't know if this is

3) The de driver does not appear to be able to change the media type
properly on my card.  Is this a known problem??  That is, an 'ifconfig de0
media 10baset' does not appear to set the media to 10 base twisted pair,
although it claims to have set the media.  Likewise for full and half
duplex.  [At least the switches blinking lights do not seem to indicate a
change in media type].

4) The de driver reports stuff like this before calming down:

de0: abnormal interrupt: transmit underflow (raising TX threshold to 128|512)
de0: abnormal interrupt: transmit underflow (raising TX threshold to 160|1024)
de0: abnormal interrupt: transmit underflow (switching to store-and-forward mode)

I really don't know what the above indicates, as such...  except to note
that it is complaints about sending packets...

I have a note book with a borrowed 3com 3C575BTX cardbus card in it that
appears to work fine with the switch at 100Mbits full duplex, although the
media type is not reported [a known problem].

Any help or comments would be appreciated.  Thanks...

Brad Spencer -
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