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From: Keith Owens <kaos@ocs.com.au>
To: Ion Badulescu <ionut@cs.columbia.edu>
cc: Jeff Garzik <jgarzik@mandrakesoft.com>,
        Alan Cox <alan@lxorguk.ukuu.org.uk>, linux-kernel@vger.kernel.org
Subject: Re: [PATCH] Proper perfect filter setup for xircom_tulip_cb.c 
In-Reply-To: Your message of "Tue, 05 Jun 2001 22:34:05 MST."
             <Pine.LNX.4.33.0106052225290.22593-100000@age.cs.columbia.edu> 
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Date: Wed, 06 Jun 2001 15:55:34 +1000
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On Tue, 5 Jun 2001 22:34:05 -0700 (PDT), 
Ion Badulescu <ionut@cs.columbia.edu> wrote:
>The reason some CardBus Xircom cards need to be put in promisc mode in 
>order to receive packets is because the driver doesn't initialize the 
>perfect filter correctly. Although it uses a single Tx descriptor to send 
>the initialization data to the card, it doesn't set either of the 
>first_segment or last_segment bits in the descriptor. No wonder the 
>chipset gets confused...

Nicely spotted.  The X3201-3 Software Specification says nothing about
the segment bits for the filter, instead the information is tucked away
in the 21143 PCI/CardBus 10/100Mb/s Ethernet LAN Controller Hardware
Reference Manual.  So Xircom have a software specification manual that
does not include the full software spec, oh the horrors.