Benoit Rat authored 11 years ago and Alessandro Rubini committed 11 years ago

* D/d,0,1 modes can not be used by the first channel (ch0)
* C/c mode is only useful for the last channel (ch4)

* wr-pps can not be used for channel 0

Signed-off-by: Alessandro Rubini <rubini@gnudd.com>