Correct logic for detecting external low frequency clock #247
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nategraff-sifive
approved these changes
Apr 13, 2020
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Part of a solution to #238, tested on Sifive HiFive1 RevB. Also adds logic for using the LFCLKMUX_SEL register which is active high instead, but as the RevB has the EXT_MUX tied to ground permanently and that mux takes priority, I cannot test that condition.