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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
	      <device>.

       gp create <-y|-n|-c> <length KiB> <partition> <enh_attr>	<ext_attr>
       <device>
	      create general purpose partition for the <device>.  Dry-run only
	      unless -y	or -c is passed.  Use -c if more partitioning settings
	      are  still to come.  To set enhanced attribute to	general	parti-
	      tion 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	(unre-
	      versible)	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  (un-
	      reversible) 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
	      settings are still to come.  NOTE!  This is a one-time  program-
	      mable (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
	      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.

       bootbus set <boot_mode> <reset_boot_bus_conditions> <boot_bus_width>
       <device>
	      Set Boot Bus  Conditions.	  <boot_mode>  must  be	 "single_back-
	      ward|single_hs|dual" <reset_boot_bus_conditions> must be "x1|re-
	      tain" <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
	      programmable (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  de-
	      vice>. 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 AAAABBBBC-
	      CCCDDDDEEEEFFFFGGGGHHHH) | 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 veri-
       fication:
	      $	mmc rpmb read-block /dev/mmcsd0rpmb 0x02 2 /tmp/block

0.1				  2015-11-16				MMC(1)

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