linux-kernel - Re: [PATCH 3/3] mtd: spi-nor: issi: is25wp256: Enable Quad Input Page Program

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <CAHyZL-cUJ7Zu=r5ZGD3p4XY9Ypdc-YuaqbKmdHjYQfAT6Fu_fA@mail.gmail.com>
Date:   Mon, 18 Jul 2022 15:56:56 +0100
From:   Sudip Mukherjee <sudip.mukherjee@...ive.com>
To:     Michael Walle <michael@...le.cc>
Cc:     Tudor Ambarus <tudor.ambarus@...rochip.com>,
        Pratyush Yadav <p.yadav@...com>,
        Miquel Raynal <miquel.raynal@...tlin.com>,
        Richard Weinberger <richard@....at>,
        Vignesh Raghavendra <vigneshr@...com>,
        Greentime Hu <greentime.hu@...ive.com>,
        Jude Onyenegecha <jude.onyenegecha@...ive.com>,
        William Salmon <william.salmon@...ive.com>,
        Adnan Chowdhury <adnan.chowdhury@...ive.com>,
        Ben Dooks <ben.dooks@...ive.com>,
        linux-mtd@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/3] mtd: spi-nor: issi: is25wp256: Enable Quad Input Page Program

Hi Michael,

On Mon, Jul 18, 2022 at 8:39 AM Michael Walle <michael@...le.cc> wrote:
>
> Am 2022-07-12 18:38, schrieb Sudip Mukherjee:
> > The flash chip is25wp256 supports Quad Input Page Program. Enable it
> > in its no_sfdp_flags flags.
>
> Are you sure, that chip doesn't have SFDP? Even the oldest datasheet
> I've found [1] mention SFDP.

Yes, that is what I expected from the datasheet. But from the driver code,
spi_nor_init_params() is calling spi_nor_init_params_deprecated() as
'parse_sfdp' is not true.
and looking at issi_nor_parts[], I can see is25wp256 is not marked
with 'PARSE_SFDP' so it
will skip parsing SFDP. The same datasheet also has is25lp256 which is
marked with 'PARSE_SFDP'
in the driver.
I tried to add 'PARSE_SFDP' to is25wp256, and I can see its mostly
working but its not using
Quad Input Page Program. I guess this support was not discovered from SFDP.

--
Regards
Sudip