Bean Huo
b7e4d5a6ae
We can use GEN_CMD (CMD56) to read a data block with vendor-specific format and meaning, which is very helpful and useful for customers to analyze device health. This patch is to add support for this command. At the same time, in order to make CMD56 universal, let more users of mmc-utils can benefit from this. We will allow the user to enter [arg] for special commands. Because some eMMC vendors provide an additional set of commands beyond the GEN_CMD (CMD56) definition in the JEDEC specification. These additional commands are implemented using generic CMD56 commands, and they return a wealth of useful information about the state of the NAND device. For these special purposes, the [31:1]stuff bits in the CMD56 argument are used. You can refer to Micron eMMC "TN-FC-32: e·MMC Device Health Report" as an example. I didn't add data parsing, just print the raw data as it is vendor-specific. Signed-off-by: Bean Huo <beanhuo@micron.com> Acked-by: Avri Altman <Avri.Altman@wdc.com> Tested-by: Rossler Jakob (Nokia - DE/Ulm) <jakob.rossler@nokia.com> Link: https://lore.kernel.org/r/20220417111622.621650-1-huobean@gmail.com Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
MMC tools (mmc-utils) ===================== mmc-utils is a tool for configuring MMC storage devices from userspace. Contribution guidelines ----------------------- The project works using a mailing list patch submission process, similar to the process used for the Linux kernel itself. One can document themselves by reading how to submit a patch in the official Linux kernel documentation: https://www.kernel.org/doc/html/latest/process/submitting-patches.html Not all sections apply but it should be a good way to get started. A patch should be sent as a mail (not as an attachement, see documentation above) to the linux-mmc@vger.kernel.org mailing list with maintainers as Cc recipients. Maintainers ----------- Avri Altman <avri.altman@wdc.com> Ulf Hansson <ulf.hansson@linaro.org> License ------- This project is licensed under GPL-2.0-only.