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[93.42.70.190]) by smtp.googlemail.com with ESMTPSA id i2-20020a056402054200b004315050d7dfsm8360263edx.81.2022.06.09.06.24.12 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 09 Jun 2022 06:24:13 -0700 (PDT) From: Ansuel Smith To: Manivannan Sadhasivam , Andy Gross , Bjorn Andersson , Miquel Raynal , Richard Weinberger , Vignesh Raghavendra , Rob Herring , Krzysztof Kozlowski , linux-mtd@lists.infradead.org, linux-arm-msm@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org Cc: Ansuel Smith Subject: [PATCH v6 0/3] Add support for unprotected spare data page Date: Thu, 9 Jun 2022 15:23:41 +0200 Message-Id: <20220609132344.17548-1-ansuelsmth@gmail.com> X-Mailer: git-send-email 2.36.1 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: devicetree@vger.kernel.org Some background about this. On original qsdk ipq8064 based firmware there was a big separation from boot partition and user partition. With boot partition we refer to partition used to init the router (bootloader, spm firmware and other internal stuff) With user partition we refer to linux partition and data partition not used to init the router. When someone had to write to these boot partition a special mode was needed, to switch the nand driver to this special configuration. Upstream version of the nandc driver totally dropped this and the result is that if someone try to read data from these partition a CRC warning is printed and if someone try to write that (if for example someone wants to replace the bootloader) result is a broken system as the data is badly written. This series comes to fix this. A user can declare offset and size of these special partition using the qcom,boot-pages binding. An initial implementation of this assumed that the boot-pages started from the start of the nand but we discover that some device have backup of these special partition and we can have situation where we have this partition scheme - APPSBL (require special mode) - APPSBLENV (doesn't require special mode) - ART - APPSBLBK (back of APPSBL require special mode) - APPSBLENVBK (back of APPSBLENV doesn't require special mode) With this configuration we need to declare sparse boot page and we can't assume boot-pages always starts from the start of the nand. A user can use this form to declare sparse boot pages qcom,boot-partitions = <0x0 0x0c80000 0x0c80000 0x0500000>; The driver internally will parse this array, convert it to nand pages and check internally on every read/write if this special configuration should used for that page or the normal one. The reason for all of this is that qcom FOR SOME REASON, disable ECC for spare data only for these boot partition and we need to reflect this special configuration to mute these warning and to permit actually writing to these pages. v6: - Add additional comments on boot partition check - First reorder struct then make change - Add additional changes request from Manivannan - Add review tag for dt commit v5: - Rename boot-pages to boot-partitions - Add additional check to parsing function - Rename unprotect_spare_data to codeword_fixup - Add additional info from Manivannan - Add patch to remove holes in qcom_nand_host struct v4: - Fix wrong compatible set for boot-pages (ipq8074 instead of ipq806x) v3: - Fix typo in Docmunetation commit desription - Add items description for uint32-matrix v2: - Add fixes from Krzysztof in Documentation Ansuel Smith (3): mtd: nand: raw: qcom_nandc: reorder qcom_nand_host struct mtd: nand: raw: qcom_nandc: add support for unprotected spare data pages dt-bindings: mtd: qcom_nandc: document qcom,boot-partitions binding .../devicetree/bindings/mtd/qcom,nandc.yaml | 27 +++ drivers/mtd/nand/raw/qcom_nandc.c | 214 +++++++++++++++++- 2 files changed, 232 insertions(+), 9 deletions(-)