does TI's Processor have the Factory only number?how to read it?

Mingming,

Each DM814x device has unique MAC address (MAC_ID0_LO, MAC_ID0_HI, MAC_ID1_LO, MAC_ID1_HI).

We have also other ID registers (CONTROL_REVISION, CONTROL_HWINFO, DEVICE_ID, SW_REVISION) available in the Control Module register map. See the DM814x TRM, section 3.2 CONTROL_MODULE Registers

Regards,
Pavel