linux-kernel - Re: [PATCH v7 7/7] mtd: ubi: provide NVMEM layer over UBI volumes

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Date: Fri, 22 Mar 2024 15:56:49 +0000
From: Daniel Golle <daniel@...rotopia.org>
To: Richard Weinberger <richard@....at>
Cc: Miquel Raynal <miquel.raynal@...tlin.com>,
	Vignesh Raghavendra <vigneshr@...com>,
	Rob Herring <robh+dt@...nel.org>,
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
	Conor Dooley <conor+dt@...nel.org>,
	linux-mtd <linux-mtd@...ts.infradead.org>,
	devicetree <devicetree@...r.kernel.org>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	david oberhollenzer <david.oberhollenzer@...ma-star.at>
Subject: Re: [PATCH v7 7/7] mtd: ubi: provide NVMEM layer over UBI volumes

On Tue, Mar 19, 2024 at 11:31:18PM +0100, Richard Weinberger wrote:
> ----- Ursprüngliche Mail -----
> > Von: "Daniel Golle" <daniel@...rotopia.org>
> >> BTW: Is there a nice way to test this with nandsim in qemu?
> >> I'd love being able to test all ubi attach code paths on my test setup.
> > 
> > From what I can tell 'nandsim' doesn't have a way to be defined in
> > Device Tree, making it unsuitable to test the attachment of UBI in
> > this way.
> > 
> > However, QEMU does support emulating TI OMAP's OneNAND controller, eg.
> > as part of the Nokia N810 hardware supported by qemu-system-arm, see
> > 
> > https://www.qemu.org/docs/master/system/arm/nseries.html
> > 
> > So we could use that and modify the device tree in Linux to have a MTD
> > partition for UBI and 'compatible = "linux,ubi";' set therein:
> > 
> > https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/arch/arm/boot/dts/ti/omap/omap2420-n8x0-common.dtsi#n84
> > 
> > If you like I can prepare such a test setup.
> 
> This would be great!
> 
> > Is there a repository for MTD/UBI tests to be run on QEMU which I should
> > contribute this to?
> 
> UBI tests reside in the mtd-utils repository.
> http://git.infradead.org/?p=mtd-utils.git;a=tree;f=tests/ubi-tests;h=20fd6a043eeb96a81736dd07885f74e4e0bb0cc0;hb=HEAD
> 
> Maybe you can provide a small shell script which configures qemu?
> It doesn't have to be fancy, just something David or I can use as staring point.

I'm working on it but it turns out to be a bit more difficult than I
thought it would be, because

 * the only devices with NAND flash emulated in QEMU or Nokia N800 and
   N810 as well as some even more ancient Intel PXA270 based PDA like
   the Sharp 'spitz'.

 * QEMU support for the N800 and N810 has apparently been bitrotting and
   is broken at least since 2019, nobody seems to care much.

 * The spitz predates device tree and hence is unsuitable for testing
   attachment of UBI via DT. But it at least boots because Guenter Roeck
   makes sure it does[1].

I was about to create a spitz-like imaginary board with DT, but also that
doesn't seem to be completely trivial.

So: hold my beer, I'll be back shortly ;)

If anyone has better ideas on how to utilize support for raw NAND or the
OneNAND controller in QEMU in a device-tree environment which actually
works, that'd be great. Obviously I don't care about other peripherals
like Bluetooth and all the complicated stuff of the N80x...

[1]: https://github.com/groeck/linux-build-test/blob/master/rootfs/arm/run-qemu-arm.sh#L64