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Re: DECstation R3000 boot error

To: Kaj-Michael Lang <milang@tal.org>
Subject: Re: DECstation R3000 boot error
From: "Maciej W. Rozycki" <macro@linux-mips.org>
Date: Tue, 24 Jan 2006 11:14:10 +0000 (GMT)
Cc: Martin Michlmayr <tbm@cyrius.com>, linux-mips@linux-mips.org
In-reply-to: <Pine.LNX.4.61.0601241147170.19397@tori.tal.org>
Original-recipient: rfc822;linux-mips@linux-mips.org
References: <20060123225040.GA23576@deprecation.cyrius.com> <Pine.LNX.4.61.0601241147170.19397@tori.tal.org>
Sender: linux-mips-bounce@linux-mips.org
On Tue, 24 Jan 2006, Kaj-Michael Lang wrote:

> > We're getting the following boot error on a DECstation with R3K CPU.
> > It simply hangs after the "high precision timer" message.  Maciej, do
> 
> It's trying to use a timer source that does not exist on the DECstation you're
> trying to use, most likely. What model is it you have ? I've tracked it down

 Well, I don't think it's possible to calculate frequency of something 
that's inexistent, yet it does...  That's a /240.

> when I got my first (working) DECstation (5000/133) a
> month or so ago. Forgot all about it under the holidays. I think
> I have a patch somewhere to fix it, I'll do some digging.

 The /133 (as all 3MINs) may have an older revision of the I/O ASIC that 
may not have the free-running counter indeed.  It's handled correctly 
regardless, except from missing timestamp precision, obviously.

 What kind of a patch do you need anyway and why isn't it yet in my mail?

  Maciej

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