Thx for your reply - well if those, who are effected, know they might consider it. Troubleshooting my own omnia costs quite some time, so if there is an easy option to solve any issue, some might consider it. Since an upgrade to 2 GB RAM seems a nice thing to do anyways…
and the question about more recent u-boot for any turris device remains. I believe recent OpenWRT also relies on current u-boot…