Debugging serial driver

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Hello!

	I've found some very strange problem. I've embedded device with linux
(kernel 2.6.14 at the moment) and sometimes, after unexpected power
failure, serial port stops receiving data. I can send data over the
port, but can't receive (just nothing arrives). If, in such case, I will
restart computer everything comes back to work. It happends for
different types of serial ports (there are two standard ports on board,
and 8 additional ports on advantech cards).
	How can I find where is the problem ?

best regards
Jarek.

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