linux-kernel - Re: [PATCH v3 1/2] mtd: spi-nor: issi: is25wp256: Init flash based on SFDP

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Message-ID: <9cf53ca3bfb39c85da968f9b46dbe6d7@walle.cc>
Date:   Wed, 21 Dec 2022 09:22:04 +0100
From:   Michael Walle <michael@...le.cc>
To:     Guenter Roeck <linux@...ck-us.net>
Cc:     Sudip Mukherjee <sudip.mukherjee@...ive.com>,
        Tudor Ambarus <tudor.ambarus@...rochip.com>,
        Pratyush Yadav <pratyush@...nel.org>,
        Miquel Raynal <miquel.raynal@...tlin.com>,
        Richard Weinberger <richard@....at>,
        Vignesh Raghavendra <vigneshr@...com>, greentime.hu@...ive.com,
        jude.onyenegecha@...ive.com, william.salmon@...ive.com,
        adnan.chowdhury@...ive.com, ben.dooks@...ive.com,
        linux-mtd@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 1/2] mtd: spi-nor: issi: is25wp256: Init flash based on
 SFDP

Hi,

Am 2022-12-21 01:30, schrieb Guenter Roeck:
> With this patch in place, qemu emulations with is25wp256 fail to
> instantiate the flash. Specifically, this affects the qemu sifive_u
> emulation. The resulting error message is:
> 
> spi-nor spi0.0: BFPT parsing failed. Please consider using
> SPI_NOR_SKIP_SFDP when declaring the flash
> spi-nor: probe of spi0.0 failed with error -22

qemu is to blame here. It doesn't fully emulate the flash. Esp. not
the SFDP tables. See also [1]. Adding the .sfdp_read hook with the
corresponding binary [2] should fix your issue.

[1] 
https://lore.kernel.org/qemu-devel/7827c791b7f91f4eb216b33473dd6103@walle.cc/
[2] 
https://lore.kernel.org/linux-mtd/CAHyZL-ch=mr0x_19e6P9G+Z4sW2iJXW9nTnXUNAhn+pTptN2ww@mail.gmail.com/

-michael