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| author | Aswath Govindraju <a-govindraju@ti.com> | 2021-08-13 23:04:42 +0530 |
|---|---|---|
| committer | Peng Fan <peng.fan@nxp.com> | 2021-09-10 18:17:23 +0800 |
| commit | b817959bd4cc90c1f6405547a2a6c242b3a4b731 (patch) | |
| tree | 1d4f9e3f21b2ef6ed0dce403c8d97b1f587fe5cf /doc | |
| parent | 19f7a34a4642e25aa8b80c6d75129fe7848a158d (diff) | |
| download | u-boot-b817959bd4cc90c1f6405547a2a6c242b3a4b731.zip u-boot-b817959bd4cc90c1f6405547a2a6c242b3a4b731.tar.gz u-boot-b817959bd4cc90c1f6405547a2a6c242b3a4b731.tar.bz2 | |
doc: usage: mmc: Document usage of speed mode in "mmc dev" and "mmc rescan"
Add documentation on the usage of "mmc dev" and "mmc rescan" commands to
set user defined speed modes.
Signed-off-by: Aswath Govindraju <a-govindraju@ti.com>
Diffstat (limited to 'doc')
| -rw-r--r-- | doc/usage/mmc.rst | 49 |
1 files changed, 47 insertions, 2 deletions
diff --git a/doc/usage/mmc.rst b/doc/usage/mmc.rst index f20efe3..d15b151 100644 --- a/doc/usage/mmc.rst +++ b/doc/usage/mmc.rst @@ -12,9 +12,9 @@ Synopsis mmc read addr blk# cnt mmc write addr blk# cnt mmc erase blk# cnt - mmc rescan + mmc rescan [mode] mmc part - mmc dev [dev] [part] + mmc dev [dev] [part] [mode] mmc list mmc wp mmc bootbus <dev> <boot_bus_width> <reset_boot_bus_width> <boot_mode> @@ -49,6 +49,27 @@ The 'mmc erase' command erases *cnt* blocks on the MMC device starting at block The 'mmc rescan' command scans the available MMC device. + mode + speed mode to set. + CONFIG_MMC_SPEED_MODE_SET should be enabled. The required speed mode is + passed as the index from the following list. + + 0 - MMC_LEGACY + 1 - MMC_HS + 2 - SD_HS + 3 - MMC_HS_52 + 4 - MMC_DDR_52 + 5 - UHS_SDR12 + 6 - UHS_SDR25 + 7 - UHS_SDR50 + 8 - UHS_DDR50 + 9 - UHS_SDR104 + 10 - MMC_HS_200 + 11 - MMC_HS_400 + 12 - MMC_HS_400_ES + + A speed mode can be set only if it has already been enabled in the device tree + The 'mmc part' command displays the list available partition on current mmc device. The 'mmc dev' command shows or set current mmc device. @@ -58,6 +79,27 @@ The 'mmc dev' command shows or set current mmc device. part partition number to change + mode + speed mode to set. + CONFIG_MMC_SPEED_MODE_SET should be enabled. The required speed mode is + passed as the index from the following list. + + 0 - MMC_LEGACY + 1 - MMC_HS + 2 - SD_HS + 3 - MMC_HS_52 + 4 - MMC_DDR_52 + 5 - UHS_SDR12 + 6 - UHS_SDR25 + 7 - UHS_SDR50 + 8 - UHS_DDR50 + 9 - UHS_SDR104 + 10 - MMC_HS_200 + 11 - MMC_HS_400 + 12 - MMC_HS_400_ES + + A speed mode can be set only if it has already been enabled in the device tree + The 'mmc list' command displays the list available devices. The 'mmc wp' command enables "power on write protect" function for boot partitions. @@ -194,6 +236,9 @@ The current device can be shown or set via 'mmc dev' command: => mmc dev 2 0 switch to partitions #0, OK mmc2 is current device + => mmc dev 0 1 4 + switch to partitions #1, OK + mmc0(part 1) is current device The list of available devices can be shown via 'mmc list' command: :: |