changing environment at build time

[Alessandro Rubini]

Hello.

I'm using barebox on a machine where I wasnt to change the mac address
at flashing time (i.e., not at build time: I'd better not relink
barebox every time I flash a new machine).

I did it lazily with a sed script when the environment was not
compressed, but now a mate updated to a newer version, and the simple
trick is not working.

Since uncompressed environent areas are not supported any more, what is
the preferred method to change the default environment variables?

Thanks
/alessandro, really on deadline, so apologizing for the dumb question