[BUG] IBM440GX works too slow under nfsroot

Daren Hayward darenh at 4bridgeworks.com
Fri Oct 22 15:57:53 EST 2004

What revision of the CPU do you have?? I know that upto rev C half duplex
has a problem with the cpu and only REV C silicon works if I am not
mistaken, there is an errata on IBM's website about this


-----Original Message-----
From: Eugene Surovegin [mailto:ebs at ebshome.net]
Sent: 22 October 2004 03:02
To: Hiroshi DOYU
Cc: Linux PPC Embedded
Subject: Re: [BUG] IBM440GX works too slow under nfsroot

On Fri, Oct 22, 2004 at 10:38:59AM +0900, Hiroshi DOYU wrote:
> On Thu, 21 Oct 2004 18:33:20 -0700
> Eugene Surovegin <ebs at ebshome.net> wrote:
> > On Fri, Oct 22, 2004 at 08:57:33AM +0900, Hiroshi DOYU wrote:
> > > Now I am strugging with booting vanilla(2.4.2x) on ibm440gx and
> > > I could succeed to boot it but, after nfs mounted, it's behavior 
> > > seems too slow. I guess, it looks like the system is running 
> > > half duplex. 
> > 
> > Yeah, driver thinks it's connected to 10Mb hub. How the board is 
> > actualy connected to the network?
> 10Mb hub.

Wow, I really had to spend some time to find such ancient hw :). I'll 
try 2.4.27 with this hub during next couple of days (I'm a little busy 
right now) and let you know. I suspect nobody really tested EMAC driver 
in 10Mb HDX mode.

You can also bug Matt Porter, maybe he'll help you sooner :).

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