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Re: NEC VR4181A

To: Steven Seeger <sseeger@stellartec.com>
Subject: Re: NEC VR4181A
From: Jun Sun <jsun@mvista.com>
Date: Wed, 12 Feb 2003 22:48:37 -0800
Cc: linux-mips@linux-mips.org, jsun@mvista.com
In-reply-to: <027601c2d2bc$8234acd0$3501a8c0@wssseeger>; from sseeger@stellartec.com on Wed, Feb 12, 2003 at 09:30:58AM -0800
Original-recipient: rfc822;linux-mips@linux-mips.org
References: <200302121823.09663.jscheel@activevb.de> <027601c2d2bc$8234acd0$3501a8c0@wssseeger>
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On Wed, Feb 12, 2003 at 09:30:58AM -0800, Steven Seeger wrote:
> Julian,
> 
> We are doing a project here at work with that board. Are you using the NEC
> Osprey? 

Osprey uses Vr4181, which is a different chip from vr4181a.

> I'm happy with this processor although it is a bit slow. 

Yes, indeed.  Pretty the slowest MIPS CPU I ever have dealt.

> I managed to get
> worst case interrupt latency at 46 microseconds with linux going full blast
> on network and compact flash stuff with our external board. (using RTAI and
> kernel 2.4.18)

Interesting.  I was trying to get RT-Linux working at one time
but aborted that effort in the middle.

Jun

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