Bricked RockPiE with "save env" command

Hi all.

Where does uboot store it’s configuration? I’ve occasionally done “env save” and got a problem:

It is definitely on MMC, 'cause fresh installation on another SD makes this RockPiE alive.

Any ideas?

P.S. Same distro burned to another SD makes no errors:

P.P.S. The only difference is “StorageInit ok = [OFFSET?]”

Quick fix: swapped first 16 MB from vanilla microSD and it works again! However the question still remains, why “env save” breaks it?