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Unfortunately, from the receiving device's perspective, there is no way for software to determine the srcid of the device sending the doorbell. You will have to build a scheme for decoding this information. Perhaps an Nwrite to a given/known memory location that the receiving device can access. The sending device could do an Nwrite to write the srcID into the receiving device's memory after doorbell completes successfully (good CC). The receiving device would then get the interrupt and then check the memory location to see who sent it.
