[fpc-pascal] synapser freezes on fopen(FDevice, 0_RDWR or 0_SYNC) on raspberry Pi

[Dennis Poon]

I downloaded http://www.turbocontrol.com/easyfpgui.htm  which as a zip 
of example of using synapse on ARM platform.
It worked on raspberry Pi (raspbian os) but it uses a specialized 
trimmed down version of Free Pascal library.
I need to work with the traditional free pascal library since my other 
part of programs rely on them.

However, when I extract the relevant code from that example and use the 
normal fpc compiler (2.6.0) instead of the pparm (2.6.2) and special fp 
lib inside that zip, my program freezes on synapser.pas   
TBlockSerial.Connect
at the line of fopen(FDevice, 0_RDWR or 0_SYNC).

I really don't understand what caused this?  a different version of fpc 
compiler or a different fp lib or because their example is GUI app and 
mine is just a console mode app?

Any advice will be appreciated.

Thanks.

Dennis

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