From: Robin Gilks <robin.gilks@tait•co.nz>
To: linuxppc mail list <linuxppc-embedded@lists•linuxppc.org>
Subject: Re: Clock rate on MPC8xx CPUs
Date: Wed, 23 Jul 2003 10:07:22 +1200 [thread overview]
Message-ID: <3F1DB59A.60603@tait.co.nz> (raw)
In-Reply-To: <3F1B4BA1.6000204@tait.co.nz>
Robin Gilks wrote:
>
> Greetings
>
> Can anyone shed some light on a question of clock rates?
>
> We're playing with the mpc866ads board and currently running both the
> CPU core and bus at 50MHz to keep things simple. As a result it seems
> that the internal Linux time is 50% out despite passing the clock rate
> from u-boot as being 50MHz.
>
> Since the mpc866 can run its core at x2 the bus rate, does the timer
> setup in Linux for this port assume that the CPU _will_ be running at x2
> from the rate passed at boot time or is there something else
> 'interesting' with this new '866 CPU :-))
Further questions on the same subject...
Does anyone have a utility that will report the CPU clock rate - we have
confirmed that the bus is running at 50MHz and that the timers are
accurate (so must also be running from the 50MHZ external bus) - but we
still have no definitive value for the clock rate of the CPU core...
--
Robin Gilks
Senior Design Engineer Phone: (+64)(3) 357 1569
Tait Electronics Fax : (+64)(3) 359 4632
PO Box 1645 Christchurch Email : robin.gilks@tait•co.nz
New Zealand
** Sent via the linuxppc-embedded mail list. See http://lists.linuxppc.org/
prev parent reply other threads:[~2003-07-22 22:07 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-07-21 2:10 Clock rate on MPC8xx CPUs Robin Gilks
2003-07-22 22:07 ` Robin Gilks [this message]
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