linux-kernel - Re: Block based OTA update needs mtdblock

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Message-ID: <1562063374.32195797.1733307383533.JavaMail.zimbra@nod.at>
Date: Wed, 4 Dec 2024 11:16:23 +0100 (CET)
From: Richard Weinberger <richard@....at>
To: Pintu Agarwal <pintu.ping@...il.com>
Cc: Miquel Raynal <miquel.raynal@...tlin.com>, 
	Vignesh Raghavendra <vigneshr@...com>, 
	linux-mtd <linux-mtd@...ts.infradead.org>, 
	chengzhihao1 <chengzhihao1@...wei.com>, 
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: Block based OTA update needs mtdblock

----- Ursprüngliche Mail -----
> Von: "Pintu Agarwal" <pintu.ping@...il.com>
>> >> 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