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SRIO: slaver just enter the doorbell ISR one time

Hi,

I used srio to transmit data from a 6455 to another. And I got it done. I want to use doorbell to communicate betweent them. When the master send doorbell, the DOORBELL1_ICSR , INTDST0_DECODE and EVTFLAG0  of slaver changed and the slaver enter the doorbell Isr. But when the master send doorbell again, just the  DOORBELL1_ICSR and INTDST0_DECODE changed, the salver cannot enter the isr again.But the doorbell state goes perfectly. When I reset the board or shut down the power,the slaver can enter ISR again,just one time. What maybe the problem. I used csl and bios to dispatchplug the interrupt, but the problem all the same.

anyone can help me.