How to obtain Ethernet MAC address?

[swarren]

If you are the kernel, then retrieving the Ethernet MAC address is pretty easy; the binary bootloader passes it to the kernel via ATAGS or command-line (I forget which of those two) or device-tree.

However, if you are U-Boot, then you don't typically receive any of those information sources (well, they're there, but since U-Boot is typically the first code to run on a CPU, or perhaps after just the boot ROM, it would be unprecedented for U-Boot to parse such information). So, if U-Boot wants to use the USB Ethernet controller, how does it determine the MAC address?

I'd rather U-Boot could pull this out of the HW directly, rather than relying on the binary bootloader to pass the information to U-Boot (which in turn would probably depend on the user not breaking config.txt, or even actively configuring it to enable some as-yet-unwritten feature). I assume the MAC must be stored in fuses or similar somewhere, since there doesn't appear to be any non-volatile memory on the RPi board. Either way, can the HW that stores this information please be at least minimally documented? I would hesitate to reverse engineer the binary bootloader; that doesn't seem productive and I'm sure there are all kinds of other issues with that approach.

[popcornmix]

Can you check #47

[popcornmix]

This should be implemented now in property channel descibed in #47. Please test.

[swarren]

Sounds great. I'm away on vacation right now, but will try to check soon after I get back.

[swarren]

I checked the firmware from #47 and it works great for get MAC. Thanks.