linux-kernel - Re: [RFC PATCH] nvmem: core: add sysfs cell write support

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Date: Tue, 20 Feb 2024 11:07:01 +0100
From: Miquel Raynal <miquel.raynal@...tlin.com>
To: Marco Felsch <m.felsch@...gutronix.de>
Cc: Michael Walle <michael@...le.cc>, srinivas.kandagatla@...aro.org,
 gregkh@...uxfoundation.org, rafal@...ecki.pl, linux-kernel@...r.kernel.org,
 kernel@...gutronix.de
Subject: Re: [RFC PATCH] nvmem: core: add sysfs cell write support

Hi Marco,

> > > > Regarding UBI(FS) I'm not sure if this is required at all since you have
> > > > an filesystem. IMHO nvmem-cells are very lowelevel and are not made for
> > > > filesystem backed backends.  
> > 
> > I'm really talking about UBI, not UBIFS. UBI is just like MTD but
> > handles wear leveling. There is a pending series for enabling nvmem
> > cells on top of UBI.  
> 
> Cells on-top of a wear leveling device? Interesting, the cell-api is
> very lowlevel which means the specified cell will be at the exact same
> place on the hardware device as specified in the dts. How do you know
> that with wear leveling underneath the cell-api?

https://lore.kernel.org/lkml/cover.1702952891.git.daniel@makrotopia.org/

I haven't tested it though.

Thanks,
Miquèl