Re: Block based OTA update needs mtdblock

[Richard Weinberger]

----- Ursprüngliche Mail -----
> Von: "Pintu Agarwal" <pintu.ping@xxxxxxxxx>
>> >> Did anybody used block based OTA update NAND A/B system without using
>> >> mtd_block ?
>> >
>> > Not on my side, it is actually a good question. Richard, any ideas?
>>
>> What about using ubiupdatevol?
>>
> As I explained above, ubiupdatevol actually performs a full volume
> update, right ?
> I think the partial/incremental update is not possible with this. Once
> the update is triggered it should finish fully.
> But for OTA updates (Delta/Incremental), only the delta changes can
> also be applied.
> Please refer to this [1] about updates mechanism.
> [1] https://medium.com/@yigitpirildak/android-ota-update-mechanism-ecc8f6f69f71
> [2]
> https://source.android.com/docs/core/ota/tools#:~:text=An%20incremental%20update%20is%20an,need%20to%20include%20unchanged%20files.
> 
> On our NAND target we support OTA updates, including incremental ota updates.
> But without mtdblock the incremental OTA update (on A/B system) will not work.
> This is the main issue.
> For full updates on ubi volumes we are already using the
> "ubiupdatevol" mechanism.

Well, for dynamic volumes you can use the UBI_IOCEBCH ioctl to replace LEBs.
So, incremental updates are doable too.

Thanks,
//richard