4

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/upgrade explicitly)?
  • if I do sudo apt-get update/upgrade on 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)

3

On your Model B, you will need to put in the SD card, boot up and do

sudo apt-get update
sudo apt-get upgrade

Then it will boot on your B+. If I remember correctly, the firmware was changed and the upgrade is needed (if older than June 20 2014).

Source: https://learn.adafruit.com/introducing-the-raspberry-pi-model-b-plus-plus-differences-vs-model-b/what-doesnt-work-anymore#you-may-need-a-new-kernel-slash-firmware

When I first got my B+, I tried a SD card with an older image. I booted up and the keyboard and Ethernet did not work. Once I upgraded the image (in my B), it worked on my B+.

So to answer your question; it will not harm anything on your B.

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