RS232 communication problems with Samsung S3C2410

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I'm using PB4.2 with a BSP based on the SMDK2410 from Samsung.

COM1 is reserved for our external device for serial communication
115200Baud 8,n,1,no handshake. I develop my application with eVC4.0 and
debug with USB/ActiveSync.
Generally I have problems to get correct data on COM1 if I use a
ReadThread, recomended by MS/Onlinehelp. I syncronize my
main-application and the ReadThread with a Semaphore-Release at the End
of a Data-Packet.

On the BSP I have tried following points:

* increase the Priority of the serial driver Com1/Com2
* remove the registry-record "TSP"="unimodem.dll" at Com1-Com2
--> my assumption that 'ActiveSync' interacts..

is there somebody witch has experiences in similar use?

many thanks for some new ideas or help
hansi

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