AP6210 no answer by uart (h4) interface after hard reset.

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What steps will reproduce the problem?
1. Do a hard reset AP6210 chip or BCM2048, for example.
2. Try to load firmware (brcm_patchram_plus) using hardware uart (not usb) 
interface.

To properly initialise chip's uart interface you must "twich" CTS line 
(HIGH->LOW->HIGH) before sending any data to them.
It may be done by opening appropriate port, pause (some msec) and then close 
port.

Original issue reported on code.google.com by basisd...@gmail.com on 2 Apr 2014 at 7:59