2021-04-02 00:15:32 +00:00
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.. SPDX-License-Identifier: GPL-2.0+:
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mmc command
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============
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Synopsis
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--------
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::
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mmc info
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mmc read addr blk# cnt
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mmc write addr blk# cnt
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mmc erase blk# cnt
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2021-08-13 17:34:42 +00:00
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mmc rescan [mode]
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2021-04-02 00:15:32 +00:00
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mmc part
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2021-08-13 17:34:42 +00:00
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mmc dev [dev] [part] [mode]
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2021-04-02 00:15:32 +00:00
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mmc list
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mmc wp
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mmc bootbus <dev> <boot_bus_width> <reset_boot_bus_width> <boot_mode>
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mmc bootpart-resize <dev> <dev part size MB> <RPMB part size MB>
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2021-05-13 22:15:43 +00:00
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mmc partconf <dev> [[varname] | [<boot_ack> <boot_partition> <partition_access>]]
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2021-04-02 00:15:32 +00:00
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mmc rst-function <dev> <value>
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Description
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-----------
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The mmc command is used to control MMC(eMMC/SD) device.
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The 'mmc info' command displays information (Manufacturer ID, OEM, Name, Bus Speed, Mode, ...) of MMC device.
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The 'mmc read' command reads raw data to memory address from MMC device with block offset and count.
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The 'mmc write' command writes raw data to MMC device from memory address with block offset and count.
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addr
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memory address
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blk#
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start block offset
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cnt
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block count
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2021-05-10 07:04:02 +00:00
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The 'mmc erase' command erases *cnt* blocks on the MMC device starting at block *blk#*.
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2021-04-02 00:15:32 +00:00
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blk#
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start block offset
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cnt
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block count
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The 'mmc rescan' command scans the available MMC device.
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2021-08-13 17:34:42 +00:00
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mode
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speed mode to set.
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CONFIG_MMC_SPEED_MODE_SET should be enabled. The required speed mode is
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passed as the index from the following list.
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0 - MMC_LEGACY
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1 - MMC_HS
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2 - SD_HS
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3 - MMC_HS_52
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4 - MMC_DDR_52
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5 - UHS_SDR12
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6 - UHS_SDR25
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7 - UHS_SDR50
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8 - UHS_DDR50
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9 - UHS_SDR104
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10 - MMC_HS_200
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11 - MMC_HS_400
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12 - MMC_HS_400_ES
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A speed mode can be set only if it has already been enabled in the device tree
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2021-04-02 00:15:32 +00:00
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The 'mmc part' command displays the list available partition on current mmc device.
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The 'mmc dev' command shows or set current mmc device.
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dev
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device number to change
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part
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partition number to change
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2021-08-13 17:34:42 +00:00
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mode
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speed mode to set.
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CONFIG_MMC_SPEED_MODE_SET should be enabled. The required speed mode is
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passed as the index from the following list.
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0 - MMC_LEGACY
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1 - MMC_HS
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2 - SD_HS
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3 - MMC_HS_52
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4 - MMC_DDR_52
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5 - UHS_SDR12
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6 - UHS_SDR25
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7 - UHS_SDR50
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8 - UHS_DDR50
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9 - UHS_SDR104
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10 - MMC_HS_200
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11 - MMC_HS_400
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12 - MMC_HS_400_ES
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A speed mode can be set only if it has already been enabled in the device tree
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2021-04-02 00:15:32 +00:00
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The 'mmc list' command displays the list available devices.
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The 'mmc wp' command enables "power on write protect" function for boot partitions.
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The 'mmc bootbus' command sets the BOOT_BUS_WIDTH field. (*Refer to eMMC specification*)
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boot_bus_width
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0x0
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x1 (sdr) or x4(ddr) buswidth in boot operation mode (default)
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0x1
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x4 (sdr/ddr) buswidth in boot operation mode
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0x2
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x8 (sdr/ddr) buswidth in boot operation mode
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0x3
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Reserved
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reset_boot_bus_width
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0x0
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Reset buswidth to x1, Single data reate and backward compatible timing after boot operation (default)
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0x1
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Retain BOOT_BUS_WIDTH and BOOT_MODE value after boot operation. This is relevant to Push-pull mode operation only
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boot_mode
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0x0
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Use single data rate + backward compatible timing in boot operation (default)
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0x1
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Use single data rate + High Speed timing in boot operation mode
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0x2
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Use dual data rate in boot operation
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0x3
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Reserved
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The 'mmc partconf' command shows or changes PARTITION_CONFIG field.
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2021-05-13 22:15:43 +00:00
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varname
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When showing the PARTITION_CONFIG, an optional environment variable to store the current boot_partition value into.
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2021-04-02 00:15:32 +00:00
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boot_ack
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boot acknowledge value
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boot_partition
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boot partition to enable for boot
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0x0
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Device not boot enabled(default)
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0x1
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Boot partition1 enabled for boot
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0x2
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Boot partition2 enabled for boot
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0x7
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User area enabled for boot
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others
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Reserved
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partition_access
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partitions to access
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The 'mmc bootpart-resize' command changes sizes of boot and RPMB partitions.
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2021-05-10 07:04:02 +00:00
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2021-04-02 00:15:32 +00:00
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dev
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device number
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boot part size MB
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target size of boot partition
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RPMB part size MB
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target size of RPMB partition
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The 'mmc rst-function' command changes the RST_n_FUNCTION field.
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**WARNING** : This is a write-once field. (*Refer to eMMC specification*)
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value
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0x0
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RST_n signal is temporarily disabled (default)
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0x1
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RST_n signal is permanently enabled
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0x2
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RST_n signal is permanently disabled
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0x3
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Reserved
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Examples
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--------
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The 'mmc info' command displays device's capabilities:
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::
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=> mmc info
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Device: EXYNOS DWMMC
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Manufacturer ID: 45
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OEM: 100
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Name: SDW16
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Bus Speed: 52000000
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Mode: MMC DDR52 (52MHz)
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Rd Block Len: 512
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MMC version 5.0
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High Capacity: Yes
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Capacity: 14.7 GiB
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Bus Width: 8-bit DDR
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Erase Group Size: 512 KiB
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HC WP Group Size: 8 MiB
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User Capacity: 14.7 GiB WRREL
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Boot Capacity: 4 MiB ENH
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RPMB Capacity: 4 MiB ENH
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Boot area 0 is not write protected
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Boot area 1 is not write protected
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The raw data can be read/written via 'mmc read/write' command:
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=> mmc read 0x40000000 0x5000 0x100
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MMC read: dev # 0, block # 20480, count 256 ... 256 blocks read: OK
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=> mmc write 0x40000000 0x5000 0x10
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MMC write: dev # 0, block # 20480, count 256 ... 256 blocks written: OK
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The partition list can be shown via 'mmc part' command:
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=> mmc part
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Partition Map for MMC device 0 -- Partition Type: DOS
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Part Start Sector Num Sectors UUID Type
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1 8192 131072 dff8751a-01 0e Boot
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2 139264 6291456 dff8751a-02 83
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3 6430720 1048576 dff8751a-03 83
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4 7479296 23298048 dff8751a-04 05 Extd
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5 7481344 307200 dff8751a-05 83
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6 7790592 65536 dff8751a-06 83
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7 7858176 16384 dff8751a-07 83
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8 7876608 22900736 dff8751a-08 83
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The current device can be shown or set via 'mmc dev' command:
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=> mmc dev
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switch to partitions #0, OK
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mmc0(part0) is current device
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=> mmc dev 2 0
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switch to partitions #0, OK
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mmc2 is current device
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2021-08-13 17:34:42 +00:00
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=> mmc dev 0 1 4
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switch to partitions #1, OK
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mmc0(part 1) is current device
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2021-04-02 00:15:32 +00:00
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The list of available devices can be shown via 'mmc list' command:
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::
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=> mmc list
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mmc list
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EXYNOS DWMMC: 0 (eMMC)
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EXYNOS DWMMC: 2 (SD)
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Configuration
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-------------
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The mmc command is only available if CONFIG_CMD_MMC=y.
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Some commands need to enable more configuration.
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write, erase
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CONFIG_MMC_WRITE
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bootbus, bootpart-resize, partconf, rst-function
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CONFIG_SUPPORT_EMMC_BOOT=y
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