mb/siemens/mc_apl2: Limit SD-Card speed to DDR50

Due to PCB limitations the SD-Card interface is not able to operate
with the highest frequency reliably. The OS driver will switch to
the highest mode if a SD-Card is attached which supports this high
frequency mode. In order to work around this PCB limitation disable the
high frequency modes in the controller capabilities (SDR104 and HS400
mode) and leave SDR50 and DDR50 enabled.

Change-Id: Ia5fed5fb70b027de34170b49620927614a00fb7a
Signed-off-by: Werner Zeh <werner.zeh@siemens.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/32542
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Patrick Rudolph <siro@das-labor.org>

0 files changed, 0 insertions, 0 deletions