Djam/u-boot
1
0
Fork 0
mirror of https://github.com/u-boot/u-boot.git synced 2025-04-22 12:54:37 +00:00
Code Issues Projects Releases Packages Wiki Activity Actions

doc: mmc rescan speed mode

Browse source 
Provide human readable descriptions of the speed nodes instead of the name
of constants from the code.

Signed-off-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
This commit is contained in:
Heinrich Schuchardt 2021-11-05 16:35:44 +01:00 • committed by Heinrich Schuchardt
parent a212f5d09c
commit 212f078496
1 changed files with 19 additions and 15 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

34
doc/usage/mmc.rst
View file

@ -51,22 +51,26 @@ The 'mmc rescan' command scans the available MMC device.
mode mode
speed mode to set. speed mode to set.
CONFIG_MMC_SPEED_MODE_SET should be enabled. The required speed mode is CONFIG_MMC_SPEED_MODE_SET should be enabled. The requested speed mode is
passed as the index from the following list. passed as a decimal number according to the following table:
0 - MMC_LEGACY ========== ==========================
1 - MMC_HS Speed mode Description
2 - SD_HS ========== ==========================
3 - MMC_HS_52 0 MMC legacy
4 - MMC_DDR_52 1 MMC High Speed (26MHz)
5 - UHS_SDR12 2 SD High Speed (50MHz)
6 - UHS_SDR25 3 MMC High Speed (52MHz)
7 - UHS_SDR50 4 MMC DDR52 (52MHz)
8 - UHS_DDR50 5 UHS SDR12 (25MHz)
9 - UHS_SDR104 6 UHS SDR25 (50MHz)
10 - MMC_HS_200 7 UHS SDR50 (100MHz)
11 - MMC_HS_400 8 UHS DDR50 (50MHz)
12 - MMC_HS_400_ES 9 UHS SDR104 (208MHz)
10 HS200 (200MHz)
11 HS400 (200MHz)
12 HS400ES (200MHz)
========== ==========================
A speed mode can be set only if it has already been enabled in the device tree A speed mode can be set only if it has already been enabled in the device tree