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Re: calibrating MIPS counter frequency

To: macro@ds2.pg.gda.pl (Maciej W. Rozycki)
Subject: Re: calibrating MIPS counter frequency
From: Alan Cox <alan@lxorguk.ukuu.org.uk>
Date: Thu, 29 Nov 2001 15:34:15 +0000 (GMT)
Cc: ralf@oss.sgi.com (Ralf Baechle), jsun@mvista.com (Jun Sun), linux-mips@oss.sgi.com
In-reply-to: <Pine.GSO.3.96.1011129161541.14485G-100000@delta.ds2.pg.gda.pl> from "Maciej W. Rozycki" at Nov 29, 2001 04:21:46 PM
Sender: owner-linux-mips@oss.sgi.com
>  On the contrary, the DECstation's undocumented I/O ASIC FCR (free running
> counter) driven by the TURBOchannel bus clock is said to be much more
> accurate than the DS1287 used there.  And it's David L. Mills who says so,
> thus we may safely assume it's true. :-)

The old DEC hardware guaranteed good time quality. But thats rather unusual
beyond DEC. 

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