linux-kernel - Re: [PATCH v6 01/11] mtd: core: always create master device

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Message-ID: <9dfb2954-fc3e-464c-a4fd-8c1a4dffa327@roeck-us.net>
Date: Sat, 7 Jun 2025 18:37:33 -0700
From: Guenter Roeck <linux@...ck-us.net>
To: Alexander Usyskin <alexander.usyskin@...el.com>
Cc: Miquel Raynal <miquel.raynal@...tlin.com>,
	Richard Weinberger <richard@....at>,
	Vignesh Raghavendra <vigneshr@...com>,
	Lucas De Marchi <lucas.demarchi@...el.com>,
	Thomas Hellström <thomas.hellstrom@...ux.intel.com>,
	Rodrigo Vivi <rodrigo.vivi@...el.com>,
	Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
	Maxime Ripard <mripard@...nel.org>,
	Thomas Zimmermann <tzimmermann@...e.de>,
	David Airlie <airlied@...il.com>, Simona Vetter <simona@...ll.ch>,
	Jani Nikula <jani.nikula@...ux.intel.com>,
	Joonas Lahtinen <joonas.lahtinen@...ux.intel.com>,
	Tvrtko Ursulin <tursulin@...ulin.net>,
	Karthik Poosa <karthik.poosa@...el.com>,
	Reuven Abliyev <reuven.abliyev@...el.com>,
	Oren Weil <oren.jer.weil@...el.com>, linux-mtd@...ts.infradead.org,
	dri-devel@...ts.freedesktop.org, intel-gfx@...ts.freedesktop.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v6 01/11] mtd: core: always create master device

Hi,

On Sun, Mar 02, 2025 at 04:09:11PM +0200, Alexander Usyskin wrote:
> Create master device without partition when
> CONFIG_MTD_PARTITIONED_MASTER flag is unset.
> 
> This streamlines device tree and allows to anchor
> runtime power management on master device in all cases.
> 
> Signed-off-by: Alexander Usyskin <alexander.usyskin@...el.com>

Several of my qemu boot tests fail to boot from mtd devices with this patch
in the mainline kernel. Reverting it fixes the problem. As far as I can
see this affects configurations with CONFIG_MTD_PARTITIONED_MASTER=y when
trying to boot from an mtd partition other than mtdblock0, with the
mtd partition data in devicetree (.../aspeed/openbmc-flash-layout.dtsi).
Is there a guidance describing the changed behavior, by any chance,
and how the boot command line now needs to look like when using one of
the flash partitions as root file system ?

Thanks,
Guenter