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ipc connect question

Other Parts Discussed in Thread: OMAPL138

when i use the ipc_1_25_00_04,the dsp execute ipc_stop,the arm  execute Ipc_control(rProcId, Ipc_CONTROLCMD_STOPCALLBACK, NULL) will return quickly ,but when i use the ipc_1_25_02_12 or later ,the arm execute Ipc_control(rProcId, Ipc_CONTROLCMD_STOPCALLBACK, NULL) will return back after 20 minute,why?if i use the ipc_1_25_00_04 ,is it ok?