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- .TH MMC 1 "2015-11-16" "0.1" "mmc-utils"
- .SH
- NAME
- mmc-utils \- Configure MMC storage devices from userspace.
- .SH
- SYNOPSIS
- mmc [<command> [<args>]] [--help]
- .PP
- mmc [<command>] --help
- .SH
- DESCRIPTION
- mmc-utils is a tool for configuring MMC storage devices from userspace.
- .SH
- COMMANDS AND OPTIONS
- .TP
- .BR "help | \-\-help | -h | " "(no arguments)"
- Shows the abbreviated help menu in the terminal.
- .TP
- .BR "extcsd read <device>"
- Print extcsd data from <device>.
- .TP
- .BR "writeprotect get <device>"
- Determine the eMMC writeprotect status of <device>.
- .TP
- .BR "writeprotect set <device>"
- Set the eMMC writeprotect status of <device>.
- This sets the eMMC to be write-protected until next boot.
- .TP
- .BR "disable 512B emulation <device>"
- Set the eMMC data sector size to 4KB by disabling emulation on
- <device>.
- .TP
- .BR "gp create <-y|-n> <length KiB> <partition> <enh_attr> <ext_attr> <device>"
- create general purpose partition for the <device>.
- Dry-run only unless -y is passed.
- To set enhanced attribute to general partition being created set <enh_attr> to 1 else set it to 0.
- To set extended attribute to general partition set <ext_attr> to 1,2 else set it to 0.
- NOTE! This is a one-time programmable (unreversible) change.
- .TP
- .BR "enh_area set <-y|-n> <start KiB> <length KiB> <device>"
- Enable the enhanced user area for the <device>.
- Dry-run only unless -y is passed.
- NOTE! This is a one-time programmable (unreversible) change.
- .TP
- .BR "write_reliability set <-y|-n> <partition> <device>"
- Enable write reliability per partition for the <device>.
- Dry-run only unless -y is passed.
- NOTE! This is a one-time programmable (unreversible) change.
- .TP
- .BR "status get <device>"
- Print the response to STATUS_SEND (CMD13).
- .TP
- .BR "bootpart enable <boot_partition> <send_ack> <device>"
- Enable the boot partition for the <device>.
- Disable the boot partition 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.
- .TP
- .BR "bootbus set <boot_mode> <reset_boot_bus_conditions> <boot_bus_width> <device>"
- Set Boot Bus Conditions.
- <boot_mode> must be "single_backward|single_hs|dual"
- <reset_boot_bus_conditions> must be "x1|retain"
- <boot_bus_width> must be "x1|x4|x8"
- .TP
- .BR "bkops enable <device>"
- Enable the eMMC BKOPS feature on <device>.
- NOTE! This is a one-time programmable (unreversible) change.
- .TP
- .BR "hwreset enable <device>"
- Permanently enable the eMMC H/W Reset feature on <device>.
- NOTE! This is a one-time programmable (unreversible) change.
- .TP
- .BR "hwreset disable <device>"
- Permanently disable the eMMC H/W Reset feature on <device>.
- NOTE! This is a one-time programmable (unreversible) change.
- .TP
- .BR "sanitize <device>"
- Send Sanitize command to the <device>.
- This will delete the unmapped memory region of the device.
- .TP
- .BR "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 programmable (unreversible) change.
- .TP
- .BR "rpmb read-counter <rpmb device>"
- Counter value for the <rpmb device> will be read to stdout.
- .TP
- .BR "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
- '-' to read key from stdin.
- .TP
- .BR "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.
- .TP
- .BR "cache enable <device>"
- Enable the eMMC cache feature on <device>.
- NOTE! The cache is an optional feature on devices >= eMMC4.5.
- .TP
- .BR "cache disable <device>"
- Disable the eMMC cache feature on <device>.
- NOTE! The cache is an optional feature on devices >= eMMC4.5.
- .TP
- .BR "<cmd> --help"
- Show detailed help for a command or subset of commands.
- .SH
- EXAMPLES
- .TP
- Program authentication key from stdin:
- echo -n AAAABBBBCCCCDDDDEEEEFFFFGGGGHHHH | mmc rpmb write-key /dev/mmcblk0rpmb -
- .TP
- Write a block of 256 bytes of data to an rpmb device:
- $ (awk 'BEGIN {while (c++<256) printf "a"}' | echo -n AAAABBBBCCCCDDDDEEEEFFFFGGGGHHHH) | mmc rpmb write-block /dev/mmcblk0rpmb 0x02 - -
- .TP
- Read a block of 256 bytes of data from an rpmb device to stdout:
- $ echo -n AAAABBBBCCCCDDDDEEEEFFFFGGGGHHHH | mmc rpmb read-block /dev/mmcblk0rpmb 0x02 2 /tmp/block -
- .TP
- Read 2 blocks of 256 bytes from rpmb device to /tmp/block without verification:
- $ mmc rpmb read-block /dev/mmcblk0rpmb 0x02 2 /tmp/block
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