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Ideally this would not be required in the first place, but hand-wired prototype
hardware still has a tendency to introduce a very small glitch or two in the reset
line over the long periods of time that the bridge needs to run with intensive data
transfer (firmware load).  These would normally be harmless if introduced on other
lines, but reset is both (for all intents and purposes) edge sensitive and a bit
of a sledgehammer to the system -- if it fires due to a glitch, the UART and LPC
bridge both drop and the UART won't come back without the host reconfiguring it...