On 03/05/2019 01:07, Timothy Froehlich wrote:

We've had a problem the past few days that we've traced back to U-Boot. We're generating images using Yocto with Mender's update routine. The issue is the first time a clean image is booted on a Raspberry Pi, the mac address gets permanently saved to the ethaddr env variable. It's a combination of this line:

https://github.com/u-boot/u-boot/blob/b4ee6daad7a2604ca9466b2ba48de86cc27d38...

and what I'm pretty sure is Mender doing a "saveenv" on first boot. If you move the SD card to a different Raspberry Pi, it will boot up with the mac address of the first Raspberry Pi.

What you would need to do is, delete ethaddr before booting on a different board. I suppose your problem is, that you want to use the same image on different boards and find yourself with the same address. Correct?

I'm not sure what the best long-term solution will be but I can make a patch for my purposes to just always set ethaddr to usbethaddr.

Well that would omit the possibility to use other MAC addresses then the one in the RPi firmware.

Regards, Matthias

So I guess i'm emailing this in to report an issue and maybe help anyone else who runs into this issue.