June 2017
Intermediate to advanced
478 pages
13h 14m
English
Content preview from Mastering Embedded Linux Programming - Second Edition
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Asymmetric image update
You can reduce storage requirements by keeping a minimal recovery operating system purely for updating the main one, as shown here:
When you want to install an update, set the Boot flag to point to the Recovery OS and reboot. Once the Recovery OS is running, it can stream updates to the main operating system image. If the update is interrupted, the Bootloader will again boot into the Recovery OS, which can resume the update. Only when the update is complete and verified will the Recovery OS clear the Boot flag and reboot again, this time loading the new main operating system. Fallback in the case of a correct but buggy ...
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.