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The MAC address is not allocated by TI. We have a bunch of MAC address that we get allotted from IEEE.
For a customer designing an Ethernet based product, they need a similar bunch of MAC address's allotted. The next task is to program them to the USERREG0 and USERREG1 so that the BOOTP in ROM Ethernet boot loader can use. Also since the BOOTP is a boot protocol, it still needs an IP address so that the network router/swtich can route the image to the device.
A simpler way of doing the same would be to flash the application image along with the MAC and then use the same on the n/w for firmware upgrades. You may use the ICDI from the EK-TM4C1294XL to flash the MAC address and first application code to the device. To be able to so, first remove the 0Ohm resistors (R8, R10, R11, R15, R16), and tap the JTAG+Reset from the right side header pins to your custom board.
几块芯片读出来的MAC地址都是ff-ff-ff-ff-ff-ff
