Subject: Re: AM79C975 bugs?
To: der Mouse <mouse@Rodents.Montreal.QC.CA>
From: David Laight <>
List: tech-net
Date: 06/05/2002 20:46:35
On Fri, May 31, 2002 at 05:39:06PM -0400, der Mouse wrote:
> I'm working with a board (not publicly available - yet, at least) that
> uses the AM79C975 for Ethernet.  It mostly Just Works, as you'd expect,
> with the 79900 support in -current.  But every once in a while, mostly
> upon dropping into ddb in the presence of network traffic, the chip
> rolls over and plays dead.

Have you tried looking at all the internal registers, the contents
of the tx and rx rings, and maybe of the rx buffers?
It might just show up where things are stuck.

(The last lance I had was the 971 - has some 'interesting' errata!)


David Laight: