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[111.241.121.209]) by smtp.gmail.com with ESMTPSA id k17sm431032pfg.99.2020.08.27.00.46.55 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 27 Aug 2020 00:46:56 -0700 (PDT) From: Green Wan To: Subject: [RFC PATCH v4 0/2] Add file-backed and write-once features to OTP Date: Thu, 27 Aug 2020 15:46:36 +0800 Message-Id: <20200827074638.21451-1-green.wan@sifive.com> X-Mailer: git-send-email 2.17.1 Received-SPF: pass client-ip=2607:f8b0:4864:20::541; envelope-from=green.wan@sifive.com; helo=mail-pg1-x541.google.com X-detected-operating-system: by eggs.gnu.org: No matching host in p0f cache. That's all we know. X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=unavailable autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: qemu-riscv@nongnu.org, Sagar Karandikar , Bastian Koppelmann , qemu-devel@nongnu.org, Green Wan , Alistair Francis , Palmer Dabbelt , bmeng.cn@gmail.com Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" Based RFC v3 to fix: - Fix all nits-related - Use blk for blk_by_legacy_dinfo(dinfo) - Move SET_WRITTEN_BIT out from else branch Summary of Patches - First patch is to add file-backed implementation to allow users to use '-drive' to assign an OTP raw image file. OTP image file must be bigger than 16K. For example, '-drive if=none,format=raw,file=otp.img' - Second patch is to add 'write-once' feature to block second write to the OTP memory. Only keep the 'written' state for non-control register range from 0x38 to 16KB. Testing - Tested on sifive_u for both qemu and u-boot. Green Wan (2): hw/riscv: sifive_u: Add backend drive support hw/riscv: sifive_u: Add write-once protection hw/riscv/sifive_u_otp.c | 71 +++++++++++++++++++++++++++++++++ include/hw/riscv/sifive_u_otp.h | 3 ++ 2 files changed, 74 insertions(+)