The docs suggest that certain registers shouldn't be messed with if the BUSY flag is set. I've tried disabling the General Purpose clocks, but the busy flag is always set.

See page 107 of the BCM2835 Peripherals document.

  • I think you're finding a niche in our current user knowledge-base.
    – Jivings
    Commented Jul 19, 2012 at 19:48
  • When I get an answer I'll record it here.
    – Dog Ears
    Commented Jul 20, 2012 at 13:06


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