| Message ID | 20240316153636.30814-1-avri.altman@wdc.com (mailing list archive) |
|---|---|
| State | New |
| Headers | show |
| Series | mmc-utils: man 1 mmc-utils | expand |
On Sat, 16 Mar 2024 at 16:36, Avri Altman <avri.altman@wdc.com> wrote: > > 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@wdc.com> Seems like a good idea! While reviewing, I found a couple of spelling mistakes and sometimes words being repeated. Can you please run a spell checker and fix those things and re-submit? Kind regards Uffe > --- > Makefile | 9 +- > mmc.1 | 302 +++++++++++++++++++++++++++++++++++++++++++++++++++++++ > 2 files changed, 306 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..b40bdf4 > --- /dev/null > +++ b/mmc.1 > @@ -0,0 +1,302 @@ > +.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 boundries, 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 poweron. > +.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 - partisioning 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. To write and read records from this special area, authentication is needed. > +The RPMB area is *only* and *exclusively* accessed using ioctl()s from userspace. > +RPMB commands are send using the mmc multi-ioctl, thus ensures that the atomic nature of the rpmb access operation. > +The rpmb device given as a parameter to the rpmb commands is not a block device but a char device. > +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 recieved content to stdout. Verify the recieved 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 verfication starting address 2 and output the recieved 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@laptop.org> and <chris@printf.net>. > +.br > +It is currently maintained by Ulf Hansson <ulf.hansson@linaro.org>. > +.SH "REPORTING BUGS" > +Report bugs to the \fBmmc\fR mailing list <linux-mmc@vger.kernel.org>. > +.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 >
> On Sat, 16 Mar 2024 at 16:36, Avri Altman <avri.altman@wdc.com> wrote: > > > > 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@wdc.com> > > Seems like a good idea! While reviewing, I found a couple of spelling mistakes > and sometimes words being repeated. Can you please run a spell checker and > fix those things and re-submit? Done. Thanks, Avri > > Kind regards > Uffe
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..b40bdf4 --- /dev/null +++ b/mmc.1 @@ -0,0 +1,302 @@ +.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 boundries, 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 poweron. +.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 - partisioning 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. To write and read records from this special area, authentication is needed. +The RPMB area is *only* and *exclusively* accessed using ioctl()s from userspace. +RPMB commands are send using the mmc multi-ioctl, thus ensures that the atomic nature of the rpmb access operation. +The rpmb device given as a parameter to the rpmb commands is not a block device but a char device. +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 recieved content to stdout. Verify the recieved 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 verfication starting address 2 and output the recieved 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@laptop.org> and <chris@printf.net>. +.br +It is currently maintained by Ulf Hansson <ulf.hansson@linaro.org>. +.SH "REPORTING BUGS" +Report bugs to the \fBmmc\fR mailing list <linux-mmc@vger.kernel.org>. +.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
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@wdc.com> --- Makefile | 9 +- mmc.1 | 302 +++++++++++++++++++++++++++++++++++++++++++++++++++++++ 2 files changed, 306 insertions(+), 5 deletions(-) create mode 100644 mmc.1