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as of r288992 use it to manage the CCNT. Use the CNNT for get_cyclecount() instead of binuptime() when device pmu is compiled in; if it fails to attach, fall back to the former method. Enable by default for the BeagleBoneBlack configuration. Optained from: Cambridge/L41 Sponsored by: DARPA/AFRL Reviewed by: andrew Differential Revision: https://reviews.freebsd.org/D3837
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