linux-kernel - Re: [RFC] mtd: ubi: skip programming unused bits in ubi headers

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Message-ID: <CAAyq3Sbv2uMnoqC1-jCfMwzs3pNRrDbT4UNkAtQTBKqYq8MAwA@mail.gmail.com>
Date: Fri, 12 Sep 2025 16:19:46 +0800
From: Cheng Ming Lin <linchengming884@...il.com>
To: Richard Weinberger <richard@....at>
Cc: chengzhihao1 <chengzhihao1@...wei.com>, Miquel Raynal <miquel.raynal@...tlin.com>, 
	Vignesh Raghavendra <vigneshr@...com>, linux-mtd <linux-mtd@...ts.infradead.org>, 
	linux-kernel <linux-kernel@...r.kernel.org>, Alvin Zhou <alvinzhou@...c.com.tw>, 
	leoyu <leoyu@...c.com.tw>, Cheng Ming Lin <chengminglin@...c.com.tw>
Subject: Re: [RFC] mtd: ubi: skip programming unused bits in ubi headers

Hi Richard,

Richard Weinberger <richard@....at> 於 2025年9月12日 週五 下午4:04寫道：
>
> ----- Ursprüngliche Mail -----
> > Von: "Cheng Ming Lin" <linchengming884@...il.com>
> >> Thanks for the detailed answer!
> >> So, yes let's apply this change.
> >
> > Sorry, I need to adjust the code a bit, since I just noticed my
> > condition on vid_hdr shift was incorrect. I will send a v2 version.
>
> I expected anyway that you'll send a non-RFC version of the patch. :)
> Just in case, you ran ubi tests with various different nands?
> nandsim can help.
> Especially with and without subpage support.

I have already run ubi-utils such as ubiformat, ubiattach,
ubimkvol, and mounting UBIFS on NAND flash.

I will also run ubi-tests with nandsim on different NANDs before
submitting the formal patch, and cover both cases you mentioned: with
and without subpage support.

>
> Thanks,
> //richard

Thanks,
Cheng Ming Lin