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[83.57.169.13]) by smtp.gmail.com with ESMTPSA id v189sm7906371wmg.14.2021.01.14.03.51.55 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 14 Jan 2021 03:51:55 -0800 (PST) Subject: Re: [PATCH 05/22] hw/sd: sd: Drop sd_crc16() To: Bin Meng , Alistair Francis , qemu-block@nongnu.org, qemu-riscv@nongnu.org, qemu-devel@nongnu.org References: <20201231113010.27108-1-bmeng.cn@gmail.com> <20201231113010.27108-6-bmeng.cn@gmail.com> From: =?UTF-8?Q?Philippe_Mathieu-Daud=c3=a9?= Message-ID: <0ff05273-3c27-94e7-e9da-36e5866e8330@amsat.org> Date: Thu, 14 Jan 2021 12:51:54 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.6.0 MIME-Version: 1.0 In-Reply-To: <20201231113010.27108-6-bmeng.cn@gmail.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit Received-SPF: pass client-ip=2a00:1450:4864:20::32c; envelope-from=philippe.mathieu.daude@gmail.com; helo=mail-wm1-x32c.google.com X-Spam_score_int: -16 X-Spam_score: -1.7 X-Spam_bar: - X-Spam_report: (-1.7 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FORGED_FROMDOMAIN=0.248, FREEMAIL_FROM=0.001, HEADER_FROM_DIFFERENT_DOMAINS=0.248, NICE_REPLY_A=-0.237, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=no 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: Bin Meng Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" On 12/31/20 12:29 PM, Bin Meng wrote: > From: Bin Meng > > commit f6fb1f9b319f ("sdcard: Correct CRC16 offset in sd_function_switch()") > changed the 16-bit CRC to be stored at offset 64. In fact, this CRC > calculation is completely wrong. Yeah: https://www.mail-archive.com/qemu-devel@nongnu.org/msg531790.html > From the original codes, it wants > to calculate the CRC16 of the first 64 bytes of sd->data[], however > passing 64 as the `width` to sd_crc16() actually counts 256 bytes > starting from the `message` for the CRC16 calculation, which is not > what we want. > > Besides that, it seems exisitng sd_crc16() algorithm does not match > the SD spec, which says CRC16 is the CCITT one but the calculation > does not produce expected result. It turns out the CRC16 was never > transfered outside the sd core, Typos "existing", "transferred". Well, I tried by adding tests, see: https://www.mail-archive.com/qemu-devel@nongnu.org/msg531777.html (Series:) https://www.mail-archive.com/qemu-devel@nongnu.org/msg531768.html > as in sd_read_byte() we see: > > if (sd->data_offset >= 64) > sd->state = sd_transfer_state; > > Given above reaons, let's drop it. > > Signed-off-by: Bin Meng > --- > > hw/sd/sd.c | 18 ------------------ > 1 file changed, 18 deletions(-)