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Best practice for partitioning and upgrading a NAND flash

Question asked by xii on Mar 8, 2012
Latest reply on Mar 8, 2012 by James.Kosin

Hello,

 

I use a BF537 based board with a 16MB NAND flash. Basically our system must be as reliable as possible (so most of the system is read-only), but I need a small read-write place for storing the configuration and the logs of the system. A "normal" customer won't get access to a linux console on the system.

 

I did the following:

  • One small MTD partition for the kernel.
  • A second read-only partition for the "root" filesystem. This partition uses UBIFS.
  • A third read-write partition for the /var directory and for the configuration files of my board. This partition also uses UBIFS.

 

While this scheme seems correct to me, I would like to get advices from others:

  • How do how deal with the robustness of the system (read-only partitions, other ideas, ...)
  • What about the choice of UBIFS for a ro partition?
  • What about my partition scheme?
  • How can I handle upgrades of my system from customers point of view (ie from non programmers person). Currently I am unable to just load rootfs.xxxxx images from uboot ; I am forced to boot a uClinux image and load the rootfs files from here. That's far from simple ...
  • ...

 

Thanks for your advices!

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