I have put together a draft man page for mmc-utils. The contents are
from mmc-utils help documents and edited for brevity. The point is not
to replace the existing docmentation, but to serve as a quick reference.
Signed-off-by: Avri Altman <avri.altman@xxxxxxx>
---
Changelog:
v1->v2: Fix some spelling mistakes
---
Makefile | 9 +-
mmc.1 | 308 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
2 files changed, 312 insertions(+), 5 deletions(-)
create mode 100644 mmc.1
diff --git a/Makefile b/Makefile
index 10b78ab..a890833 100644
--- a/Makefile
+++ b/Makefile
@@ -21,6 +21,7 @@ prefix ?= /usr/local
bindir = $(prefix)/bin
LIBS=
RESTORE_LIBS=
+mandir = /usr/share/man
progs = mmc
@@ -29,7 +30,7 @@ ifdef C
check = sparse $(CHECKFLAGS)
endif
-all: $(progs) manpages
+all: $(progs)
.c.o:
ifdef C
@@ -43,16 +44,14 @@ mmc: $(objects)
manpages:
$(MAKE) -C man
-install-man:
- $(MAKE) -C man install
-
clean:
rm -f $(progs) $(objects)
$(MAKE) -C man clean
-install: $(progs) install-man
+install: $(progs)
$(INSTALL) -m755 -d $(DESTDIR)$(bindir)
$(INSTALL) $(progs) $(DESTDIR)$(bindir)
+ $(INSTALL) -m 644 mmc.1 $(DESTDIR)$(mandir)/man1
-include $(foreach obj,$(objects), $(dir $(obj))/.$(notdir $(obj)).d)
diff --git a/mmc.1 b/mmc.1
new file mode 100644
index 0000000..888b8b6
--- /dev/null
+++ b/mmc.1
@@ -0,0 +1,308 @@
+.TH mmc\-utils 1 "April 2024" "User Manual"
+.SH NAME
+mmc \- a tool for configuring MMC storage devices
+.SH SYNOPSIS
+.B mmc
+[\fIoptions\fR] [\ mmc\-block\-device\fR]...
+.SH DESCRIPTION
+.B mmc-utils
+is a single-threaded tool that will perform a particular type of mmc action as specified by the user.
+.br
+The typical use of mmc-utils is to access the mmc device either for configuring or reading its configuration registers.
+.SH OPTIONS
+.TP
+.BI extcsd " " read " " \fIdevice\fR
+Read and prints the extended csd register
+.TP
+.BI extcsd " " write " " \fIoffset\fR " " \fIvalue\fR " " \fIdevice\fR
+Write \fIvalue\fR at \fIoffset\fR to the device's extcsd
+.TP
+.BI writeprotect " " boot " " get " " \fIdevice\fR
+Print the boot partitions write protect status
+.TP
+.BI writeprotect " " boot " " set " " \fIdevice\fR " " [\fInumber\fR]
+Set the boot partition write protect status for the device.
+.br
+If \fInumber\fR is passed (0 or 1), only protect that particular eMMC boot partition, otherwise protect both.
+.br
+It will be write-protected until the next boot.
+.TP
+.BI writeprotect " " user " " set " " \fItype\fR " " \fIstart\-block\fR " " \fIblocks\fR " " \fIdevice\fR
+Set the write protect configuration for the specified region of the user area for the device.
+.br
+\fIstart\-block\fR specifies the first block of the protected area.
+.br
+\fIblocks\fR specifies the size of the protected area in blocks.
+.br
+NOTE! The area must start and end on Write Protect Group boundaries, Use the "writeprotect user get" command to get the Write Protect Group size.
+ \fItype\fR is one of the following:
+.RS
+.RS
+.TP
+.B none
+Clear temporary write protection.
+.TP
+.B temp
+Set temporary write protection.
+.TP
+.B pwron
+Set write protection until the next power on.
+.RE
+.RE
+.TP
+.BI writeprotect " " user " " get " " \fIdevice\fR
+Print the user areas write protect configuration for the device.
+.TP
+.BI disable " " 512B " " emulation " " \fIdevice\fR
+Set the eMMC data sector size to 4KB by disabling emulation on the device.
+.TP
+.BI gp " " create " " \fIdry\-run\fR " " \fIlength\-KiB\fR " " \fIpartition\fR " " \fIenh\-attr\fR " " \fIext\-attr\fR " " \fIdevice\fR
+Create general purpose partition for the the device.
+.br
+NOTE! This is a one-time programmable (unreversible) change.
+.br
+To set enhanced attribute to general partition being created set \fIenh\-attr\fR to 1 else set it to 0.
+.br
+To set extended attribute to general partition set \fIenh\-attr\fR to 1,2 else set it to 0.
+.br
+\fIdry\-run\fR is one of the following:
+.RS
+.RS
+.TP
+.B \-y
+PARTITION_SETTING_COMPLETED in the extcsd will get set and the partisioning operation will take effect and finalized.
+.TP
+.B \-c
+more partitioning settings are still to come - partitioning operation will not take effect.
+.TP
+.B otherwise
+These changes will not take effect neither now nor after a power cycle.
+.RE
+.RE
+.TP
+.BI enh_area " " set " " \fIdry\-run\fR " " \fIstart\-KiB\fR " " \fIlength\-KiB\fR " " \fIdevice\fR
+Enable the enhanced user area for the device.
+.br
+NOTE! This is a one-time programmable (unreversible) change.
+\fIdry\-run\fR is as above.
+.TP
+.BI write_reliability " " set " " " \fIdry\-run\fR " " \fIpartition\fR " " \fIdevice\fR
+Enable write reliability per partition for the device.
+.br
+NOTE! This is a one-time programmable (unreversible) change.
+\fIdry\-run\fR is as above.
+.TP
+.BI status " " get " " \fIdevice\fR
+Print the response to STATUS_SEND (CMD13).
+.TP
+.BI bootpart " " enable " " \fIboot\-partition\fR " " \fIsend\-ackn\fR " " \fIdevice\fR
+Enable the boot partition for the device.
+Disable the boot partition for the device if is \fIboot\-partition\fR set to 0.
+.br
+To receive acknowledgment of boot from the card set \fIsend\-ackn\fR to 1, else set it to 0.
+.TP
+.BI bootbus " " set " " \fIboot\-mode\fR " " \fIreset\-boot\-bus\-conditions\fR " " \fIboot\-bus\-width\fR " " \fIdevice\fR
+Set Boot Bus Conditions.
+.br
+\fIboot\-mode\fR is one of the following: single_backward, single_hs, or dual.
+.br
+\fIreset\-boot\-bus\-conditions\fR is one of the following: x1 or retain.
+.br
+\fIboot\-bus\-width\fR is one of the following: x1, x4, or x8.
+.TP
+.BI bkops_en " " \fImode\fR " " \fIdevice\fR
+Enable the eMMC BKOPS feature on the device.
+The auto (AUTO_EN) setting is only supported on eMMC 5.0 or newer.
+.br
+NOTE! Setting manual (MANUAL_EN) is one-time programmable (unreversible) change.
+.br
+\fImode\fR is one of the following:
+.RS
+.RS
+.TP
+.B auto
+Auto backops is set
+.TP
+.B manual
+Manual bkops is set
+.RE
+.RE
+.TP
+.BI hwreset " " enable " " \fIdevice\fR
+Permanently enable the eMMC H/W Reset feature on the device.
+.br
+NOTE! This is a one-time programmable (unreversible) change.
+.TP
+.BI hwreset " " disable " " \fIdevice\fR
+Permanently disable the eMMC H/W Reset feature on the device.
+.br
+NOTE! This is a one-time programmable (unreversible) change.
+.TP
+.BI sanitize " " \fIdevice\fR " " \fI[timeout_ms]\fR
+Send Sanitize command to the device.
+This will delete the unmapped memory region of the device.
+.TP
+.BI rpmb " " write\-key " " \fIrpmb\-device\fR " " \fIkey\-file\fR
+Program authentication key which is 32 bytes length and stored in the specified file.
+.br
+Also you can specify '-' instead of key file path to read the key from stdin.
+.br
+NOTE! This is a one-time programmable (unreversible) change.
+.TP
+.BI rpmb " " read\-counter " " \fIrpmb\-device\fR
+Counter value for the \fIrpmb\-device\fR will be read to stdout.
+.TP
+.BI rpmb " " read\-block " " \fIrpmb\-device\fR " " \fIaddress\fR " " \fIblocks-\count\fR " " \fIoutput-\file\fR " " [\fIkey\-file\fR]
+Blocks of 256 bytes will be read from \fIrpmb\-device\fR to output
+file or stdout if '-' is specified. If key is specified - read
+data will be verified.
+.TP
+.BI rpmb " " write\-block " " \fIrpmb\-device\fR " " \fIaddress\fR " " \fI256\-byte\-data\-file\fR " " \fIkey\-file\fR
+Block of 256 bytes will be written from data file to
+\fIrpmb\-device\fR.
+.br
+Also you can specify '-' instead of key file path or data file to read the data from stdin.
+.TP
+.BI cache " " enable " " \fIdevice\fR
+Enable the eMMC cache feature on the device.
+.br
+NOTE! The cache is an optional feature on devices >= eMMC4.5.
+.TP
+.BI cache disable " " \fIdevice\fR
+Disable the eMMC cache feature on the device.
+.br
+NOTE! The cache is an optional feature on devices >= eMMC4.5.
+.TP
+.BI csd " " read " " \fidevice\-path\fR
+Print CSD data from \fIdevice\-path\fR.
+The device path should specify the csd sysfs file directory.
+.TP
+.BI cid " " read " " \fIdevice\-path\fR
+Print CID data from \fIdevice\-path\fR.
+The device path should specify the cid sysfs file directory.
+.TP
+.BI scr " " read " " \fIdevice\-path\fR
+Print SCR data from \fIdevice\-path\fR.
+The device path should specify the scr sysfs file directory.
+.TP
+.BI ffu " " \fIimage\-file\-name\fR " " \fIdevice\fR " " [\fIchunk\-bytes\fR]
+Run Field Firmware Update with \fIimage\-file\-name\fR on the device.
+.br
+[\fIchunk\-bytes\fR] is optional and defaults to its max - 512k. should be in decimal bytes and sector aligned.
+.br
+if [\fIchunk\-bytes\fR] is omitted, mmc-utils will try to run ffu using the largest possible chunks: max(image-file, 512k).
+.TP
+.BI erase " " \fItype\fR " " \fIstart-address\fR " " \fIend\-address\fR " " \fIdevice\fR
+Send Erase CMD38 with specific argument to the device.
+.br
+NOTE!: This will delete all user data in the specified region of the device.
+.br
+\fItype\fR is one of the following: legacy, discard, secure-erase, secure-trim1, secure-trim2, or trim.
+.TP
+.BI gen_cmd " " read " \fidevice\fR [\fIarg\fR]
+Send GEN_CMD (CMD56) to read vendor-specific format/meaning data from the device.
+.br
+NOTE!: [\fIarg\fR] is optional and defaults to 0x1. If [\fIarg\fR] is specified, then [\fIarg\fR]
+must be a 32-bit hexadecimal number, prefixed with 0x/0X. And bit0 in [\fIarg\fR] must be 1.
+Normally this command is aimed to extract a device-health info from the device.
+.TP
+.BI softreset " " \fIdevice\fR
+Issues a CMD0 softreset, e.g. for testing if hardware reset for UHS works
+.TP
+.BI boot_operation " " \fIboot\-data\-file\fR " " \fIdevice\fR
+ Does the alternative boot operation and writes the specified starting blocks of boot data into the requested file.
+Note some limitations:
+.RS
+.RS
+.TP
+.B 1)
+The boot operation must be configured first, e.g. via bootbus and/or bootpart commands
+.TP
+.B 2)
+The MMC must currently be running at the bus mode that is configured for the boot operation (HS200 and HS400 not supported at all).
+.TP
+.B 3)
+Only up to 512K bytes of boot data will be transferred.
+.TP
+.B 4)
+The MMC will perform a soft reset, if your system cannot handle that do not use the boot operation from mmc-utils.
+.RE
+.RE
+.TP
+.BI \-\-help " " | " " help " " | " " \-h
+Show the help
+.TP
+.BI \fIcmd\fR " " \-\-help
+Show detailed help for that specific \fIcmd\fR or subset of commands.
+.SH "RPMB COMMANDS"
+The RPMB partition on the eMMC devices is a special area used for storing cryptographically safe information signed by a
+special secret key.
+.br
+To write and read records from this special area, authentication is needed.
+.br
+The RPMB area is *only* and *exclusively* accessed using ioctl()s from user-space.
+.br
+RPMB commands are send using the mmc multi-ioctl, thus ensures that the atomic nature of the rpmb access operation.
+.br
+The rpmb device given as a parameter to the rpmb commands is not a block device but a char device.
+.br
+This was done to help the mmc driver to account for some of the rpmb peculiarities.
+.SH "EXAMPLES"
+.RE
+.P
+.B RPMB examples
+.RS
+Program rpmb key using the stdin option:
+.RS
+.P
+$ echo -n AAAABBBBCCCCDDDDEEEEFFFFGGGGHHHH | mmc rpmb write-key /dev/mmcblk0rpmb -
+.RE
+.P
+Read 2 blocks starting address 2 and output the received content to stdout. Verify the received frames using the key (not mandatory):
+.RS
+.P
+$ echo -n AAAABBBBCCCCDDDDEEEEFFFFGGGGHHHH | mmc rpmb read-block /dev/mmcblk0rpmb 0x02 2 -
+.RE
+.P
+Read 2 blocks without verification starting address 2 and output the received content to /tmp/block:
+.RS
+.P
+$mmc rpmb read-block /dev/mmcblk0rpmb 0x02 2 /tmp/block
+.RE
+.P
+Write a string of 'a's to address 2. both the input and key uses stdin interface:
+.RS
+.P
+$ (awk 'BEGIN {while (c++<256) printf "a"}' | echo -n AAAABBBBCCCCDDDDEEEEFFFFGGGGHHHH) | mmc rpmb write-block /dev/mmcblk0rpmb 0x02 - -
+.RE
+.P
+.RE
+.P
+.B Field Firmware Update (ffu) examples
+.RS
+Do ffu using max-possible chunk size: If the fluf size < 512k, it will be flushed in a single write sequence.
+.RS
+.P
+$ mmc ffu IO4e0aC2056001801M1100042AE1.fluf /dev/mmcblk0
+.RE
+.P
+Same as above, this time use a 4k chunks:
+.RS
+.P
+$ mmc ffu IO4e0aC2056001801M1100042AE1.fluf /dev/mmcblk0 4096
+.RE
+.P
+.RE
+.SH AUTHORS
+.B mmc-utils
+was written by Chris Ball <cjb@xxxxxxxxxx> and <chris@xxxxxxxxxx>.
+.br
+It is currently maintained by Ulf Hansson <ulf.hansson@xxxxxxxxxx>.
+.SH "REPORTING BUGS"
+Report bugs to the \fBmmc\fR mailing list <linux-mmc@xxxxxxxxxxxxxxx>.
+.SH "SEE ALSO"
+For further documentation see \fBREADME\fR.
+.br
+A short intro - https://docs.kernel.org/driver-api/mmc/mmc-tools.html
+.br
+official git tree - https://git.kernel.org/pub/scm/utils/mmc/mmc-utils.git
--
2.42.0
