So, I've several SDs bearing several OSes (Debian, Occidentalis, Raspbmc) for my several Pi Bs and my question is two-fold:
- can I (safely) boot B+ Pi from those cards w/o a risk they will be corrupted/changed (without me doing the
sudo apt-get update/upgradeexplicitly)?
- if I do
sudo apt-get update/upgradeon B+, will there be any changes (to kernel etc) that will make the OS unusable when returned to my "old" Bs?
(GPIO usage/configuration is not part of this question)