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GET /api/1.2/patches/2234475/?format=api
{ "id": 2234475, "url": "http://patchwork.ozlabs.org/api/1.2/patches/2234475/?format=api", "web_url": "http://patchwork.ozlabs.org/project/linux-mtd/patch/20260507-winbond-v6-18-rc1-spi-nor-swp-v5-22-93453e1a9597@bootlin.com/", "project": { "id": 3, "url": "http://patchwork.ozlabs.org/api/1.2/projects/3/?format=api", "name": "Linux MTD development", "link_name": "linux-mtd", "list_id": "linux-mtd.lists.infradead.org", "list_email": "linux-mtd@lists.infradead.org", "web_url": null, "scm_url": null, "webscm_url": null, "list_archive_url": "", "list_archive_url_format": "", "commit_url_format": "" }, "msgid": "<20260507-winbond-v6-18-rc1-spi-nor-swp-v5-22-93453e1a9597@bootlin.com>", "list_archive_url": null, "date": "2026-05-07T16:47:03", "name": "[v5,22/28] mtd: spi-nor: Add steps for testing locking with CMP", "commit_ref": null, "pull_url": null, "state": "new", "archived": false, "hash": "2062a1e910967a74403e5c1f80b199494226a676", "submitter": { "id": 73368, "url": "http://patchwork.ozlabs.org/api/1.2/people/73368/?format=api", "name": "Miquel Raynal", "email": "miquel.raynal@bootlin.com" }, "delegate": null, "mbox": "http://patchwork.ozlabs.org/project/linux-mtd/patch/20260507-winbond-v6-18-rc1-spi-nor-swp-v5-22-93453e1a9597@bootlin.com/mbox/", "series": [ { "id": 503226, "url": "http://patchwork.ozlabs.org/api/1.2/series/503226/?format=api", "web_url": "http://patchwork.ozlabs.org/project/linux-mtd/list/?series=503226", "date": "2026-05-07T16:46:51", "name": "mtd: spi-nor: Enhance software protection", "version": 5, "mbox": "http://patchwork.ozlabs.org/series/503226/mbox/" } ], "comments": "http://patchwork.ozlabs.org/api/patches/2234475/comments/", "check": "pending", "checks": "http://patchwork.ozlabs.org/api/patches/2234475/checks/", "tags": {}, "related": [], "headers": { "Return-Path": "\n <linux-mtd-bounces+incoming=patchwork.ozlabs.org@lists.infradead.org>", "X-Original-To": "incoming@patchwork.ozlabs.org", "Delivered-To": "patchwork-incoming@legolas.ozlabs.org", "Authentication-Results": [ "legolas.ozlabs.org;\n\tdkim=pass (2048-bit key;\n secure) header.d=lists.infradead.org header.i=@lists.infradead.org\n header.a=rsa-sha256 header.s=bombadil.20210309 header.b=0/9C2LNG;\n\tdkim=fail reason=\"signature verification failed\" (2048-bit key;\n unprotected) header.d=bootlin.com header.i=@bootlin.com header.a=rsa-sha256\n header.s=dkim header.b=V79yClZ0;\n\tdkim-atps=neutral", "legolas.ozlabs.org;\n spf=none (no SPF record) smtp.mailfrom=lists.infradead.org\n (client-ip=2607:7c80:54:3::133; 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a=rsa-sha256; q=dns/txt; c=relaxed/relaxed;\n\td=lists.infradead.org; s=bombadil.20210309; h=Sender:\n\tContent-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post:\n\tList-Archive:List-Unsubscribe:List-Id:Cc:To:In-Reply-To:References:Message-Id\n\t:MIME-Version:Subject:Date:From:Reply-To:Content-ID:Content-Description:\n\tResent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:\n\tList-Owner; bh=VG8whYbD8wEqLX+ZoBjoEOlEKxVhm4yNbY/tJPofX68=; b=0/9C2LNGGoOjuf\n\tHfCUSQz2GMEyTSNh/oL1gvM9sT7le/oJlame7qEt36SnufvoaPLPORTmvuqxGmRyR5+g20qUw4NXV\n\t7FvY7louJwfgK23iWzzITTZBKfZGYMGyinaAYWREx/Ips4iiZZnS9gf9isjt/EdUjaZFpVF2tOimc\n\thIg7d0I33fw4zsS54zVPQYYjkpf9GKM2P67GbzMbSznWy69NiMkW0D909HY0eeLUeGRizhzBNKkKW\n\ttAnCYMvViUnpVRs4Qlo68IJzk2CCFIlS+B6ajtyEaaDledpppDmmrdpQjwLVg1BGmsAR7RFN0Cggc\n\tJ69GrsQdCRv9uo1CiRIg==;", "v=1; a=rsa-sha256; c=relaxed/relaxed; d=bootlin.com; s=dkim;\n\tt=1778172454; h=from:subject:date:message-id:to:cc:mime-version:content-type:\n\t content-transfer-encoding:in-reply-to:references;\n\tbh=yhA+2VgT+o8G4u2gJrAlTlAd70E3ujcNCL/mf5Wc020=;\n\tb=V79yClZ0ondZxWahZNR19BLo5lhNx3GWoRvbgMVf/jShRbtdrsRPvYz08hI6AxCxdwZL8k\n\txDAoSKO7TIC3LMrVA6I1NyRXRKKRVLYVm/nS+RT0S0n+n1kqQ+x5qWNe9Fh1B93PGWldmR\n\t/CrAVfZTMWi0K2S+XrDdC3cOloI+exKo6uHuBdqPWD2o2ogyewJnBqalQ1qr5Nj7bLqvtF\n\tRZUHyuyrQVBEIt5k8Yssc95AiHFA0UbN+v8qHXDw/GmSAwrVyKe2wz0W5I24kg7hV/HRv5\n\twT7I+7GqSkvww4OtQZj1F9rnEaYiOudQafbykExnPYbQ6ZxczcZKqpvK66AYKg==" ], "From": "Miquel Raynal <miquel.raynal@bootlin.com>", "Date": "Thu, 07 May 2026 18:47:03 +0200", "Subject": "[PATCH v5 22/28] mtd: spi-nor: Add steps for testing locking with\n CMP", "MIME-Version": "1.0", "Message-Id": "\n <20260507-winbond-v6-18-rc1-spi-nor-swp-v5-22-93453e1a9597@bootlin.com>", "References": "\n <20260507-winbond-v6-18-rc1-spi-nor-swp-v5-0-93453e1a9597@bootlin.com>", "In-Reply-To": "\n <20260507-winbond-v6-18-rc1-spi-nor-swp-v5-0-93453e1a9597@bootlin.com>", "To": "Pratyush Yadav <pratyush@kernel.org>, Michael Walle <mwalle@kernel.org>,\n Takahiro Kuwano <takahiro.kuwano@infineon.com>,\n Richard Weinberger <richard@nod.at>, Vignesh Raghavendra <vigneshr@ti.com>,\n Jonathan Corbet <corbet@lwn.net>, Tudor Ambarus <tudor.ambarus@linaro.org>,\n Shuah Khan <skhan@linuxfoundation.org>", "Cc": "Sean Anderson <sean.anderson@linux.dev>,\n Thomas Petazzoni <thomas.petazzoni@bootlin.com>,\n Steam Lin <STLin2@winbond.com>, linux-mtd@lists.infradead.org,\n linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org,\n Miquel Raynal <miquel.raynal@bootlin.com>", "X-Mailer": "b4 0.14.3", "X-Last-TLS-Session-Version": "TLSv1.3", "X-CRM114-Version": "20100106-BlameMichelson ( TRE 0.9.0 (BSD) ) MR-646709E3 ", "X-CRM114-CacheID": "sfid-20260507_094737_412435_25A36649 ", "X-CRM114-Status": "GOOD ( 10.17 )", "X-Spam-Score": "-2.1 (--)", "X-Spam-Report": "Spam detection software,\n running on the system \"bombadil.infradead.org\",\n has NOT identified this incoming email as spam. The original\n message has been attached to this so you can view it or label\n similar future email. If you have any questions, see\n the administrator of that system for details.\n Content preview: Extend the test coverage by giving guidelines to verify the\n CMP bit acts according to our expectations. Signed-off-by: Miquel Raynal\n <miquel.raynal@bootlin.com> --- The instructions listed in this file target\n people adding support for new chips,\n however here are below extra steps that\n I also ran with th [...]\n Content analysis details: (-2.1 points, 5.0 required)\n pts rule name description\n ---- ----------------------\n --------------------------------------------------\n -0.0 SPF_HELO_PASS SPF: HELO matches SPF record\n -0.0 SPF_PASS SPF: sender matches SPF record\n -0.1 DKIM_VALID_EF Message has a valid DKIM or DK signature from\n envelope-from domain\n -0.1 DKIM_VALID Message has at least one valid DKIM or DK\n signature\n -0.1 DKIM_VALID_AU Message has a valid DKIM or DK signature from\n author's\n domain\n 0.1 DKIM_SIGNED Message has a DKIM or DK signature,\n not necessarily valid\n -1.9 BAYES_00 BODY: Bayes spam probability is 0 to 1%\n [score: 0.0000]\n -0.0 DMARC_PASS DMARC pass policy", "X-BeenThere": "linux-mtd@lists.infradead.org", "X-Mailman-Version": "2.1.34", "Precedence": "list", "List-Id": "Linux MTD discussion mailing list <linux-mtd.lists.infradead.org>", "List-Unsubscribe": "<http://lists.infradead.org/mailman/options/linux-mtd>,\n <mailto:linux-mtd-request@lists.infradead.org?subject=unsubscribe>", "List-Archive": "<http://lists.infradead.org/pipermail/linux-mtd/>", "List-Post": "<mailto:linux-mtd@lists.infradead.org>", "List-Help": "<mailto:linux-mtd-request@lists.infradead.org?subject=help>", "List-Subscribe": "<http://lists.infradead.org/mailman/listinfo/linux-mtd>,\n <mailto:linux-mtd-request@lists.infradead.org?subject=subscribe>", "Content-Type": "text/plain; charset=\"us-ascii\"", "Content-Transfer-Encoding": "7bit", "Sender": "\"linux-mtd\" <linux-mtd-bounces@lists.infradead.org>", "Errors-To": "linux-mtd-bounces+incoming=patchwork.ozlabs.org@lists.infradead.org" }, "content": "Extend the test coverage by giving guidelines to verify the CMP bit acts\naccording to our expectations.\n\nSigned-off-by: Miquel Raynal <miquel.raynal@bootlin.com>\n---\nThe instructions listed in this file target people adding support for\nnew chips, however here are below extra steps that I also ran with the\nsame W25H512NWxxAM chip. They are here to prove core correctness.\n\n $ flash_lock -u /dev/mtd0\n $ flash_lock -l /dev/mtd0 0 1008\n $ show_sectors\n software locked sectors\n region (in hex) | status | #sectors\n ------------------+----------+---------\n 00000000-03efffff | locked | 1008\n 03f00000-03ffffff | unlocked | 16\n $ flash_lock -l /dev/mtd0 0 1009\n $ show_sectors # should not change\n software locked sectors\n region (in hex) | status | #sectors\n ------------------+----------+---------\n 00000000-03efffff | locked | 1008\n 03f00000-03ffffff | unlocked | 16\n $ flash_lock -l /dev/mtd0 0 1015\n $ show_sectors # should not change\n software locked sectors\n region (in hex) | status | #sectors\n ------------------+----------+---------\n 00000000-03efffff | locked | 1008\n 03f00000-03ffffff | unlocked | 16\n $ flash_lock -l /dev/mtd0 0 1016\n $ show_sectors # should cover more\n software locked sectors\n region (in hex) | status | #sectors\n ------------------+----------+---------\n 00000000-03f7ffff | locked | 1016\n 03f80000-03ffffff | unlocked | 8\n $ flash_lock -u /dev/mtd0 $((1015 * $bs)) 1\n $ show_sectors # should not change\n software locked sectors\n region (in hex) | status | #sectors\n ------------------+----------+---------\n 00000000-03f7ffff | locked | 1016\n 03f80000-03ffffff | unlocked | 8\n $ flash_lock -u /dev/mtd0 $((1009 * $bs)) 7\n $ show_sectors # should not change\n software locked sectors\n region (in hex) | status | #sectors\n ------------------+----------+---------\n 00000000-03f7ffff | locked | 1016\n 03f80000-03ffffff | unlocked | 8\n $ flash_lock -u /dev/mtd0 $((1008 * $bs)) 8\n $ show_sectors # range should reduce down to initial value\n software locked sectors\n region (in hex) | status | #sectors\n ------------------+----------+---------\n 00000000-03efffff | locked | 1008\n 03f00000-03ffffff | unlocked | 16\n\n [Similar situations, on the other side of the device]\n\n $ flash_lock -u /dev/mtd0\n $ flash_lock -l /dev/mtd0 $((16 * $bs)) 1008\n $ show_sectors\n software locked sectors\n region (in hex) | status | #sectors\n ------------------+----------+---------\n 00000000-000fffff | unlocked | 16\n 00100000-03ffffff | locked | 1008\n $ flash_lock -l /dev/mtd0 $((15 * $bs)) 1009\n $ show_sectors # should not change\n software locked sectors\n region (in hex) | status | #sectors\n ------------------+----------+---------\n 00000000-000fffff | unlocked | 16\n 00100000-03ffffff | locked | 1008\n $ flash_lock -l /dev/mtd0 $((9 * $bs)) 1015\n $ show_sectors # should not change\n software locked sectors\n region (in hex) | status | #sectors\n ------------------+----------+---------\n 00000000-000fffff | unlocked | 16\n 00100000-03ffffff | locked | 1008\n $ flash_lock -l /dev/mtd0 $((8 * $bs)) 1016\n $ show_sectors # should cover more\n software locked sectors\n region (in hex) | status | #sectors\n ------------------+----------+---------\n 00000000-0007ffff | unlocked | 8\n 00080000-03ffffff | locked | 1016\n $ flash_lock -u /dev/mtd0 $((8 * $bs)) 1\n $ show_sectors # should not change\n software locked sectors\n region (in hex) | status | #sectors\n ------------------+----------+---------\n 00000000-0007ffff | unlocked | 8\n 00080000-03ffffff | locked | 1016\n $ flash_lock -u /dev/mtd0 $((8 * $bs)) 7\n $ show_sectors # should not change\n software locked sectors\n region (in hex) | status | #sectors\n ------------------+----------+---------\n 00000000-0007ffff | unlocked | 8\n 00080000-03ffffff | locked | 1016\n $ flash_lock -u /dev/mtd0 $((8 * $bs)) 8\n $ show_sectors # range should reduce down to initial value\n software locked sectors\n region (in hex) | status | #sectors\n ------------------+----------+---------\n 00000000-000fffff | unlocked | 16\n 00100000-03ffffff | locked | 1008\n---\n Documentation/driver-api/mtd/spi-nor.rst | 37 ++++++++++++++++++++++++++++++++\n 1 file changed, 37 insertions(+)", "diff": "diff --git a/Documentation/driver-api/mtd/spi-nor.rst b/Documentation/driver-api/mtd/spi-nor.rst\nindex b42de32c6eba..896cff9c7675 100644\n--- a/Documentation/driver-api/mtd/spi-nor.rst\n+++ b/Documentation/driver-api/mtd/spi-nor.rst\n@@ -335,3 +335,40 @@ section, after the ``---`` marker.\n ------------------+----------+---------\n 00000000-0000ffff | locked | 1\n 00010000-03ffffff | unlocked | 1023\n+\n+ If the flash features a Complement (CMP) bit, we can protect with\n+ more granularity above half of the capacity. Let's lock all but one\n+ block, then unlock one more block::\n+\n+ root@1:~# all_but_one=$((($size / $bs) - ($ss / $bs)))\n+\n+ root@1:~# flash_lock -u /dev/mtd0\n+ root@1:~# flash_lock -l /dev/mtd0 $ss $all_but_one # all but the first\n+ root@1:~# show_sectors\n+ software locked sectors\n+ region (in hex) | status | #sectors\n+ ------------------+----------+---------\n+ 00000000-0000ffff | unlocked | 1\n+ 00010000-03ffffff | locked | 1023\n+ root@1:~# flash_lock -u /dev/mtd0 $ss $(($ss / $bs)) # all but the two first\n+ root@1:~# show_sectors\n+ software locked sectors\n+ region (in hex) | status | #sectors\n+ ------------------+----------+---------\n+ 00000000-0001ffff | unlocked | 2\n+ 00020000-03ffffff | locked | 1022\n+ root@1:~# flash_lock -u /dev/mtd0\n+ root@1:~# flash_lock -l /dev/mtd0 0 $all_but_one # same from the other side\n+ root@1:~# show_sectors\n+ software locked sectors\n+ region (in hex) | status | #sectors\n+ ------------------+----------+---------\n+ 00000000-03feffff | locked | 1023\n+ 03ff0000-03ffffff | unlocked | 1\n+ root@1:~# flash_lock -u /dev/mtd0 $(($size - (2 * $ss))) $(($ss / $bs)) # all but two\n+ root@1:~# show_sectors\n+ software locked sectors\n+ region (in hex) | status | #sectors\n+ ------------------+----------+---------\n+ 00000000-03fdffff | locked | 1022\n+ 03fe0000-03ffffff | unlocked | 2\n", "prefixes": [ "v5", "22/28" ] }