From owner-freebsd-current  Fri May 17 09:41:33 1996
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Date: Sat, 18 May 1996 02:40:13 +1000
From: Bruce Evans <bde@zeta.org.au>
Message-Id: <199605171640.CAA29856@godzilla.zeta.org.au>
To: freebsd-current@freebsd.org, syssgm@devetir.qld.gov.au
Subject: Re: Wildly inaccurate clock calibration.
Sender: owner-current@freebsd.org
X-Loop: FreeBSD.org
Precedence: bulk

>I don't know how much you care about my ancient hardware, but I got this
>from the new clock calibration code when run on my 16Mhz 386sx:

>May 15 13:02:44 stupid /kernel: FreeBSD 2.2-CURRENT #45: Wed May 15 01:06:31 EST 1996
>May 15 13:02:44 stupid /kernel:     syssgm@stupid.devetir.qld.gov.au:/usr/src/sys/compile/STUPID
>May 15 13:02:44 stupid /kernel: Calibrating clock(s) relative to mc146818A clock ... i8254 clock: 63817 Hz
>May 15 13:02:45 stupid /kernel: 63817 Hz differs from default of 1193182 Hz by more than 1%
>May 15 13:02:45 stupid /kernel: CPU: i386DX (386-class CPU)

>and on a subsequent reboot:

>May 16 17:01:33 stupid /kernel: 63814 Hz differs from default of 1193182 Hz by more than 1%

You are experienced enough to debug it :-).  Start by defining option
CLK_CALIBRATION_LOOP and booting with -v.  Each calibration should take
about 1 second if the mc14* clock is working.

Bruce