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<== Date ==> <== Thread ==>

Subject: Re: IOC time 1min=90sec ??
From: Andrew Johnson <anj@mail.ast.cam.ac.uk>
Date: Tue, 17 Jan 1995 15:34:16 GMT
On Mon, 16 Jan 95 13:50:35 -0600 winans@aps.anl.gov wrote:

> Hmmmm that is 33.3333333333333333333% off the expected speed.  I find
> it interesting to note that 33 is 33.33.3333333333333333333% more than
> 25.  I don't fully understand your entire note.  But I suspect that you
> have a 33mHz mvme167 board that has its vxWorks configured for a 25mHz
> board.

I've never heard of a milli-Herz MV167!  (Sorry, couldn't resist that!)

I hadn't thought about this as being a symptom of having the wrong speed 
setting, but it makes perfect sense.

> I don't exectly know how to set the value in the NVRAM to to proper
> value, but that would be the nice way to fix the problem...  Otherwise
> you will have to change the hard-coded clock rate settings in sysLib.c.
> Grep for 'cpuSpeed' in sysLib.c to find the line(s) of interest.  (WRS
> blew it, the value on the assignment should be #define'd.)

Simple, for a 33Mhz CPU (33 = 0x21):

->m 0xfffc00fe
fffc00fe:  0000-21ee
fffc0100:  0000-.

value = 1 = 0x1
->reboot

- Andrew

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