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bh=1vUP7EaiupmjLjnWhpFPdqHFtResgU15SEluT122fdQ=; b=XRsHA19icJnAD9cmqkJsdQVJOed46ZkF21bvfDwgEPPMH05HVIMfqCkCGzbDaIIBo7ZMwF 08UusgwppYT2PyZtagSxCGP5U7AXgPDlVrEr9z8dzK9FMjMeSk6IpSUxghN81sQvLMVg2x nr55yiulbLgztR7p++2zfaaVEcxvGxxwiU7Y5G/USMiJSEM8z2Sf9bNVH7XdpGhIN2VCIa jiPmkuY3Bp9EEMLRC59kWRrdsagY9vz8NhAzApbnwEUoQbjZydTxBKWERvju5Lb1Lu/gwQ zsV4Tq+uTFtqiqUUsjVPld/HmUiqukYnDF9wHiQkMbEF5KPWaAT/L6hslMXtpQ== MIME-Version: 1.0 Date: Wed, 19 Oct 2022 11:38:48 +0200 From: Michael Walle To: "Farber, Eliav" Cc: tudor.ambarus@microchip.com, pratyush@kernel.org, miquel.raynal@bootlin.com, richard@nod.at, vigneshr@ti.com, linux-mtd@lists.infradead.org, linux-kernel@vger.kernel.org, talel@amazon.com, jonnyc@amazon.com, hhhawa@amazon.com, hanochu@amazon.com, itamark@amazon.com, shellykz@amazon.com, amitlavi@amazon.com, dkl@amazon.com Subject: Re: [PATCH v2 1/1] mtd: spi-nor: micron-st: Enable locking for n25q256ax1/mt25qu256a In-Reply-To: <1ba2e7ff-cf6c-1292-72e0-14b5b5b9282c@amazon.com> References: <20221019071631.15191-1-farbere@amazon.com> <73bfa5ae90e2269387540019806c2839@walle.cc> <1ba2e7ff-cf6c-1292-72e0-14b5b5b9282c@amazon.com> User-Agent: Roundcube Webmail/1.4.13 Message-ID: X-Sender: michael@walle.cc X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20221019_024010_751933_6D5BA51A X-CRM114-Status: GOOD ( 16.25 ) X-BeenThere: linux-mtd@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: Linux MTD discussion mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Transfer-Encoding: 7bit Content-Type: text/plain; charset="us-ascii"; Format="flowed" Sender: "linux-mtd" Errors-To: linux-mtd-bounces+linux-mtd=archiver.kernel.org@lists.infradead.org Am 2022-10-19 11:25, schrieb Farber, Eliav: > On 10/19/2022 11:21 AM, Michael Walle wrote: >> Hi, >> >> Am 2022-10-19 09:16, schrieb Eliav Farber: >>> n25q256ax1 [1] and mt25qu256a [2] (both have same jedec_id - >>> 0x20bb19) >>> use the 4 bit Block Protection scheme and support Top/Bottom >>> protection >>> via the BP and TB bits of the Status Register. >>> BP3 is located in bit 6 of the Status Register. >>> Tested on both n25q256ax1 and mt25qu256a. >>> >>> [1] >>> https://www.micron.com/-/media/client/global/documents/products/data-sheet/nor-flash/serial-nor/n25q/n25q_256mb_3v.pdf >>> [2] >>> https://www.micron.com/-/media/client/global/documents/products/data-sheet/nor-flash/serial-nor/mt25q/die-rev-a/mt25q_qljs_u_256_aba_0.pdf >> >> If you respin, you can use a "Link:" tag for the URL above. > > Ack. > >>> Signed-off-by: Eliav Farber >>> --- >>> xxd -p >>> /sys/devices/platform/soc/fd882000.spi/spi_master/spi0/spi0.0/spi-nor/sfdp >>> 53464450060101ff00060110300000ff84000102800000ffffffffffffff >>> ffffffffffffffffffffffffffffffffffffe520fbffffffff0f29eb276b >>> 273b27bbffffffffffff27bbffff29eb0c2010d80f520000244a99008b8e >>> 03d4ac0127387a757a75fbbdd55c4a0f82ff81bd3d36ffffffffffffffff >>> ffffffffffffffffffe7ffff21dcffff >>> >>> md5sum >>> /sys/devices/platform/soc/fd882000.spi/spi_master/spi0/spi0.0/spi-nor/sfdp >>> 5ea738216f68c9f98987bb3725699a32 >>> /sys/devices/platform/soc/fd882000.spi/spi_master/spi0/spi0.0/spi-nor/sfdp >>> cat >>> /sys/devices/platform/soc/fd882000.spi/spi_master/spi0/spi0.0/spi-nor/jedec_id >>> 20bb19104400 >>> >>> cat >>> /sys/devices/platform/soc/fd882000.spi/spi_master/spi0/spi0.0/spi-nor/partname >>> mt25qu256a >>> >>> cat >>> /sys/devices/platform/soc/fd882000.spi/spi_master/spi0/spi0.0/spi-nor/manufacturer >>> st >> >> That's the mt25qu256a SFDP. What about the n25q256ax1? > > On the same card, with same NOR flash memory I'm running two different > kernel versions. > First version is quite old - 4.19.239 which does not support mt25qu256a > and therefore device is detected as n25q256ax1. > Second version is 6.1.0-rc1 and it detects the same device as > mt25qu256a. > So I was able to dump SFDP when running version 6.1.0-rc1, but not when > running 4.19.239 which does not support the sysfs to dump the SFPD > information. > I checked that locking works with my changes when running on both > kernel > versions. So you've only tested on an mt25qu256a, correct? Then you should only add the locking to this flash device. (and maybe backport the mt25qu256a to your older kernel). -michael ______________________________________________________ Linux MTD discussion mailing list http://lists.infradead.org/mailman/listinfo/linux-mtd/