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Re: port-arm/48096 (arm/BEAGLEBONE machdep.frequency.current sysctl node missing)
The following reply was made to PR port-arm/48096; it has been noted by GNATS.
From: Dennis Ferguson <dennis.c.ferguson%gmail.com@localhost>
Subject: Re: port-arm/48096 (arm/BEAGLEBONE machdep.frequency.current sysctl
Date: Mon, 5 Aug 2013 12:56:20 -0400
On 31 Jul, 2013, at 20:36 , matt%netbsd.org@localhost wrote:
> I committed a few fixes which allows the sysctl to work.
> The problem with the sysctl_createv call was a missing comma
> before CTL_CREATE.
That fixed the immediate problem, thanks, but is probably
insufficient to actually change the frequency since MPU
frequency changes apparently require accompanying voltage
changes to the MPU VDD. The AM3359 lists these values for
the revision "blank" parts (I think this is the BB):
Those are nominal values, the min and max are +/-4%. For
the revision "A" parts (I think the BB Black) it has:
where the range is, again, +/-4%. The MPU voltage is
the VCDCD2 output from the tps65217c.
This seems not to be a bug any more since none of the
infrastructure associated with the tps65217 was designed
with this in mind. Maybe the bug should be closed?
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