Updating kernel+fs without risk

Alex,

You should be able to try the new kernel and filesystem via MMC.

Once satisfied, you can flash it.

Yes, but in case of power down in the middle of burning I will stuck without any kernel+fs on board.

I'm seeking for a solution where just after u-boot it will check what kernel+fs (from two available sets) are last and will load it.

In case of bad burning the second set of kernel+fs, the first one will be loaded.

Alex.

Well, then you need to create custom partitions on the NAND device. Only problem is how do you detect the the kernel+fs is not burnt properly? Via checksum?

What if the kernel was flashed properly and there is a power down while flashing filesystem (or the other way)?

After burning kernel+fs and checking checksum, we can burn signature (time stamp) in constant place (in the beginning of the NAND's last sector for example).

The signature of the second set will be burned nearby.

On startup we will compare these two signatures and choose to load the set refers the latest.

In case there is only one signature, we will know that the second set was burned unsuccessfully.

When we burn a new version, we check these time stamps and know what is the older set we will replace.

Alex.

This is how I see it if I would implement it.

But I'm sure somebody already did something like that...

If I will fail to find it, I will have to implement it by myself.

Alex.