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In the DM816x TRM, chapter 25 ROM Code, I can see that only EMAC0 (GMII0, CPGMAC0) is supported for boot by the ROM code.
25.5.2.1 MBOOT Configuration Pins
The following shortcuts are used in the table:
Ethernet Ethernet GMII0 interface (EMAC port 0)
25.8.4 Ethernet Boot Procedure Ethernet boot uses the CPGMAC0 subsystem of the device, connected to external Ethernet PHY using the GMII0 and MDIO pins.
Table 25-24. Pins Used for Ethernet Boot - GMII0 pins
