MCAPI communication problem between ARM & SHARC2 (ADSP-SC589) ...

Hello

Product: ADSP-SC589 evolution board.
FreeRTOS : 10.0.0
CCES :    2.8.2.0


we have implemented  a thread based MCAPI program on ARM side & freeRTOS based MCAPI program on SHARC core2.
But, after the MCAPI initialization & mcapi_endpoint_create() , both side program stuck at mcapi_endpoint_get() with the MCAPI_TIMEOUT.
I have successfully implemented MCAPI program for ARM-SHARC1 & SHARC1-SHARC2.
What's the problem between ARM & SHARC2 --- I'm unable to identify....