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Serial port blocks!!!

Hello everybody.

My problem is, that I have connected a GSM modem on the serial port (ser2)
of the developer board. The modem is turned on, then I can write and read
commands from the serial port. But if I connect the axis board and the modem
before the modem is turned on, then I could write but I can't read from
ser2. I allways get -1, when I try to read.
Can anybody help me??

Andreas Auer