mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-12-21 02:33:07 +00:00
962424a873
The patch drops 0x prefixes because all numbers are interpreted as HEX by default. Also, it fixes the mismatch between input arguments and output at 'mmc write' example. Now it's 256 (0x100) blocks. Signed-off-by: Alexander Shirokov <shirokovalexs@gmail.com> Reviewed-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
268 lines
7.7 KiB
ReStructuredText
268 lines
7.7 KiB
ReStructuredText
.. 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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mmc rescan [mode]
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mmc part
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mmc dev [dev] [part] [mode]
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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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mmc partconf <dev> [[varname] | [<boot_ack> <boot_partition> <partition_access>]]
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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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The 'mmc erase' command erases *cnt* blocks on the MMC device starting at block *blk#*.
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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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mode
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speed mode to set.
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CONFIG_MMC_SPEED_MODE_SET should be enabled. The requested speed mode is
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passed as a decimal number according to the following table:
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========== ==========================
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Speed mode Description
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========== ==========================
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0 MMC legacy
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1 MMC High Speed (26MHz)
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2 SD High Speed (50MHz)
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3 MMC High Speed (52MHz)
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4 MMC DDR52 (52MHz)
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5 UHS SDR12 (25MHz)
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6 UHS SDR25 (50MHz)
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7 UHS SDR50 (100MHz)
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8 UHS DDR50 (50MHz)
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9 UHS SDR104 (208MHz)
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10 HS200 (200MHz)
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11 HS400 (200MHz)
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12 HS400ES (200MHz)
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========== ==========================
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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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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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mode
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speed mode to set.
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CONFIG_MMC_SPEED_MODE_SET should be enabled. The requested speed mode is
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passed as a decimal number according to the following table:
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========== ==========================
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Speed mode Description
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========== ==========================
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0 MMC legacy
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1 MMC High Speed (26MHz)
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2 SD High Speed (50MHz)
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3 MMC High Speed (52MHz)
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4 MMC DDR52 (52MHz)
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5 UHS SDR12 (25MHz)
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6 UHS SDR25 (50MHz)
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7 UHS SDR50 (100MHz)
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8 UHS DDR50 (50MHz)
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9 UHS SDR104 (208MHz)
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10 HS200 (200MHz)
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11 HS400 (200MHz)
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12 HS400ES (200MHz)
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========== ==========================
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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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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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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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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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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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::
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=> mmc read 40000000 5000 100
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MMC read: dev # 0, block # 20480, count 256 ... 256 blocks read: OK
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=> mmc write 40000000 5000 100
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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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::
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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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=> 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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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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