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TDA4VM: how to set the FIQ in the main domain r5f

Binbin Ding
Prodigy 75 points
Part Number: TDA4VM

dear experts:

                  I use the api Osal_RegisterInterrupt to register the timer isr , the interrupt  priority can only be set to 0x01~0x0f, can not set to 0x00. why?

                 can you provide the api that we can can set the interrupt type to FIQ?  If we set to the FIQ type, will it affect rtos operation or system in the main domain r5f(mcu2_0 or  mcu2_1)?

thank you!