On 2/26/21 11:01 AM, Jaehoon Chung wrote:
Provide a man-pages for the mmc command.
Signed-off-by: Jaehoon Chung jh80.chung@samsung.com
doc/usage/mmc.rst | 149 ++++++++++++++++++++++++++++++++++++++++++++++
Thanks a lot for providing a man-page for the mmc command.
You have to change doc/usage/index.rst too.
1 file changed, 149 insertions(+) create mode 100644 doc/usage/mmc.rst
diff --git a/doc/usage/mmc.rst b/doc/usage/mmc.rst new file mode 100644 index 000000000000..30fee447d409 --- /dev/null +++ b/doc/usage/mmc.rst @@ -0,0 +1,149 @@ +.. SPDX-License-Identifier: GPL-2.0+:
+mmc command +============
+Synopsis +--------
+::
- mmc info
- mmc read addr blk# cnt
- mmc write addr blk# cnt
- mmc erase blk# cnt
- mmc rescan
- mmc part
- mmc dev [dev] [part]
- mmc list
- mmc wp
- mmc bootbus <dev> <boot_bus_width> <reset_boot_bus_width> <boot_mode>
- mmc bootpart-resize <dev> <dev part size MB> <RPMB part size MB>
- mmc partconf <dev> [boot_ack boot_partition partition_access]
This sub-command is missing below.
- mmc rst-function <dev> <value>
+Description +-----------
+The mmc command is used to control MMC(eMMC/SD) device
Please, add missing full stops '.'.
+The *mmc info* displays information (Manufacturer ID, OEM, Name, Bus Speed, Mode, ...) of MMC device
+The *mmc read* command reads raw data to memory address from MMC device with block offset and count
+The *mmc write* write raw data to MMC device from memory address with block offset and count
- addr - memory address
Please format arguments like this:
addr memory address
You can check the formatting using 'make htmldocs'.
- blk# - start block offset
- cnt - block count
+The *mmc erase* erases MMC device from block offset until count
- blk# - start block offset
- cnt - block count
+The *mmc rescan* scans the available MMC device
+The *mmc part* displays the list available partition on current mmc device
+The *mmc dev* show or set current mmc device
- [dev]
Please, remove the brackets.
device number to change- [part]
partition number to change+The *mmc list* displays the list avaiable devices
The *mmc list* command ...
+The *mmc wp* enables "power on write protect" function about boot partitions
The *mmc wp* command ...
%s/about/for/
Please, mention that power cycling is needed to lift the write protection.
+The *mmc bootbus* sets the BOOT_BUS_WIDTH feild
The *mmc bootbus* command ...
%s/feild/field/
- BOOTU_BUS_WIDTH[177] is one of EXT_CSD register. (*Refer to eMMC specification*)
+The *mmc-bootpart-resize* changes sizes of boot and RPMB partition
partitions.
- dev - device number
- boot part size MB - Size to change boot partition
How about:
target size of boot partition
- RPMB part size MB - Size to chagne RPMB partition
%s/chagne/change/
target size of RPMB partition
+The *mmc rst-function* change the RST_n_FUNCTION filed
field?
I think we should describe what a RST_n_FUNCTION is.
We should enumerate the allowable values. The eMMC specification (JEDEC Standard No. 84-B51, 2014) has:
0x0: RST_n signal is temporarily disabled (default) 0x1: RST_n signal is permanently enabled 0x2: RST_n signal is permanently disabled
- **WARNING**: This is a write-once filed. (*Refer to eMMC specification*)
%s/filed/field/
+Example +-------
+The *mmc info* command displays device's capabilities: +::
- => mmc info
- Device: EXYNOS DWMMC
- Manufacturer ID: 45
- OEM: 100
- Name: SDW16
- Bus Speed: 52000000
- Mode: MMC DDR52 (52MHz)
- Rd Block Len: 512
- MMC version 5.0
- High Capacity: Yes
- Capacity: 14.7 GiB
- Bus Width: 8-bit DDR
- Erase Group Size: 512 KiB
- HC WP Group Size: 8 MiB
- User Capacity: 14.7 GiB WRREL
- Boot Capacity: 4 MiB ENH
- RPMB Capacity: 4 MiB ENH
- Boot area 0 is not write protected
- Boot area 1 is not write protected
+The raw data can be read/written via *mmc read/write* command: +::
- => mmc read 0x40000000 0x5000 0x100
- MMC read: dev # 0, block # 20480, count 256 ... 256 blocks read: OK
- => mmc write 0x40000000 0x5000 0x10
- MMC write: dev # 0, block # 20480, count 256 ... 256 blocks written: OK
+The partition list can be shown via *mmc part* command: +::
- => mmc part
- Partition Map for MMC device 0 -- Partition Type: DOS
- Part Start Sector Num Sectors UUID Type
1 8192 131072 dff8751a-01 0e Boot2 139264 6291456 dff8751a-02 833 6430720 1048576 dff8751a-03 834 7479296 23298048 dff8751a-04 05 Extd5 7481344 307200 dff8751a-05 836 7790592 65536 dff8751a-06 837 7858176 16384 dff8751a-07 838 7876608 22900736 dff8751a-08 83+The current device can be shown or set via *mmc dev* command: +::
- => mmc dev
- switch to partitions #0, OK
- mmc0(part0) is current device
- => mmc dev 2 0
- switch to partitions #0, OK
- mmc2 is current device
+The list of available devices can be shown via *mmc list* command: +::
- => mmc list
- mmc list
- EXYNOS DWMMC: 0 (eMMC)
- EXYNOS DWMMC: 2 (SD)
+Configuration +-------------
+The mmc command is only avaialble if CONFIG_CMD_MMC=y. +Some commands need to enable more configuration.
Some sub-command need require further configuration:
+* write / erase - CONFIG_MMC_WRITE
write, erase CONFIG_MMC_WRITE=y
+* bootbus - CONFIG_SUPPORT_EMMC_BOOT=y
Best regards
Heinrich