Forget my last posting, the shared serial irq handler works fine. The
state i had described will never happens.
So, the only good thing in this patch is the low_latency modification
and the test of the ier shadow register in the receive_chars(),
transmit_chars() and check_modem_status().
Sorry, next time i will think more about it, bevore posting it.
Greetings,
Stefani
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