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MMC(1) mmc-utils MMC(1) NAME mmc-utils - Configure MMC storage devices from userspace. SYNOPSIS mmc [<command> [<args>]] [--help] mmc [<command>] --help DESCRIPTION mmc-utils is a tool for configuring MMC storage devices from userspace. COMMANDS AND OPTIONS help | --help | -h | (no arguments) Shows the abbreviated help menu in the terminal. extcsd read <device> Print extcsd data from <device>. writeprotect get <device> Determine the eMMC writeprotect status of <device>. writeprotect set <device> Set the eMMC writeprotect status of <device>. This sets the eMMC to be write-protected until next boot. disable 512B emulation <device> Set the eMMC data sector size to 4KB by disabling emulation on <de- vice>. gp create <-y|-n|-c> <length KiB> <partition> <enh_attr> <ext_attr> <de- vice> create general purpose partition for the <device>. Dry-run only un- less -y or -c is passed. Use -c if more partitioning settings are still to come. To set enhanced attribute to general partition being created set <enh_attr> to 1 else set it to 0. To set extended at- tribute to general partition set <ext_attr> to 1,2 else set it to 0. NOTE! This is a one-time programmable (unreversible) change. enh_area set <-y|-n|-c> <start KiB> <length KiB> <device> Enable the enhanced user area for the <device>. Dry-run only unless -y or -c is passed. Use -c if more partitioning settings are still to come. NOTE! This is a one-time programmable (unreversible) change. write_reliability set <-y|-n|-c> <partition> <device> Enable write reliability per partition for the <device>. Dry-run only unless -y or -c is passed. Use -c if more partitioning set- tings are still to come. NOTE! This is a one-time programmable (unreversible) change. status get <device> Print the response to STATUS_SEND (CMD13). bootpart enable <boot_partition> <send_ack> <device> Enable the boot partition for the <device>. Disable the boot parti- tion for the <device> with <boot_partition> set to 0. To receive acknowledgment of boot from the card set <send_ack> to 1, else set it to 0. bootbus set <boot_mode> <reset_boot_bus_conditions> <boot_bus_width> <de- vice> Set Boot Bus Conditions. <boot_mode> must be "single_backward|sin- gle_hs|dual" <reset_boot_bus_conditions> must be "x1|retain" <boot_bus_width> must be "x1|x4|x8" bkops enable <device> Enable the eMMC BKOPS feature on <device>. NOTE! This is a one- time programmable (unreversible) change. hwreset enable <device> Permanently enable the eMMC H/W Reset feature on <device>. NOTE! This is a one-time programmable (unreversible) change. hwreset disable <device> Permanently disable the eMMC H/W Reset feature on <device>. NOTE! This is a one-time programmable (unreversible) change. sanitize <device> Send Sanitize command to the <device>. This will delete the un- mapped memory region of the device. rpmb write-key <rpmb device> <key file> Program authentication key which is 32 bytes length and stored in the specified file. Also you can specify '-' instead of key file path to read the key from stdin. NOTE! This is a one-time program- mable (unreversible) change. rpmb read-counter <rpmb device> Counter value for the <rpmb device> will be read to stdout. rpmb read-block <rpmb device> <address> <blocks count> <output file> [key file] Blocks of 256 bytes will be read from <rpmb device> to output file or stdout if '-' is specified. If key is specified - read data will be verified. Instead of regular path you can specify rpmb write-block <rpmb device> <address> <256 byte data file> <key file> Block of 256 bytes will be written from data file to <rpmb device>. Also you can specify '-' instead of key file path or data file to read the data from stdin. cache enable <device> Enable the eMMC cache feature on <device>. NOTE! The cache is an optional feature on devices >= eMMC4.5. cache disable <device> Disable the eMMC cache feature on <device>. NOTE! The cache is an optional feature on devices >= eMMC4.5. <cmd> --help Show detailed help for a command or subset of commands. EXAMPLES Program authentication key from stdin: echo -n AAAABBBBCCCCDDDDEEEEFFFFGGGGHHHH | mmc rpmb write-key /dev/mmcsd0rpmb - Write a block of 256 bytes of data to an rpmb device: $ (awk 'BEGIN {while (c++<256) printf "a"}' | echo -n AAAABBBBCCCCD- DDDEEEEFFFFGGGGHHHH) | mmc rpmb write-block /dev/mmcsd0rpmb 0x02 - - Read a block of 256 bytes of data from an rpmb device to stdout: $ echo -n AAAABBBBCCCCDDDDEEEEFFFFGGGGHHHH | mmc rpmb read-block /dev/mmcsd0rpmb 0x02 2 /tmp/block - Read 2 blocks of 256 bytes from rpmb device to /tmp/block without verifica- tion: $ mmc rpmb read-block /dev/mmcsd0rpmb 0x02 2 /tmp/block 0.1 2015-11-16 MMC(1)
NAME | SYNOPSIS | DESCRIPTION | COMMANDS AND OPTIONS | EXAMPLES
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