OMAP3530 serial hang

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Hello
I'm using Embest Devkit8000 with 2.6.37 kernel and I'm experiencing issues with 
serial port.
I have a modem (gprs8000) attached to /dev/ttyO0 and during operation it 
randomly freezes (sometimes I have to wait long time, say, about 1-2 hours). 
After the freeze I cannot use that port anymore (unless I reboot), even if 
I remove the modem: microcom gets stuck and I have to kill -9 it, 
so I presume the driver is hung.

Could you please help me with this issue?

Thanks and regards
Mario

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