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Re: [patch] linux: declance multicast filter fixes

To: "Maciej W. Rozycki" <>
Subject: Re: [patch] linux: declance multicast filter fixes
From: Harald Koerfgen <>
Date: Fri, 29 Mar 2002 08:57:50 +0100
Cc: Dave Airlie <>, Ralf Baechle <>,,
In-reply-to: <>
Organization: none to speak of
References: <>
On Thursday 28 March 2002 14:01, Maciej W. Rozycki wrote:
>  But the I/O ASIC chip is smart enough to merge data from the 8-bit ROM
> device without problems and present four consecutive bytes as 32-bit
> quantities to the host CPU.

A simple 4 to 1 mapping is easy, even for the average hardware developer :-)

> Why couldn't it do the same for the LANCE?
> Host memory addresses are generated on behalf of the LANCE by the I/O ASIC
> anyway.

Probably because this would have made the IOASIC 0.0034 cents more expensive?

> Of course not all designers have a clue, sigh...  A brief study of
> available documentation suggests no merging mode was implemented for the
> LANCE and bit 0 of addresses generated is simply hardwired to 0. :-(

That's my interpretation as well.


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