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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 <>
Subject: Re: port-arm/48096 (arm/BEAGLEBONE machdep.frequency.current sysctl 
node missing)
Date: Mon, 5 Aug 2013 12:56:20 -0400

 On 31 Jul, 2013, at 20:36 , 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):
     MHz    Volts
     275    1.100
     500    1.100
     600    1.200
     720    1.260
 Those are nominal values, the min and max are +/-4%.  For
 the revision "A" parts (I think the BB Black) it has:
     MHz    Volts
     300    0.950
     600    1.100
     720    1.200
     800    1.260
    1000    1.325
 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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