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user: Add i.MX 7D MMC/SDCard driver

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Close #3525.
This commit is contained in:
Sebastian Huber 2018-09-25 10:13:19 +02:00
parent cec2f2c9cf
commit bd25da8805
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user/bsps/bsps-arm.rst
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@ -130,6 +130,14 @@ system controls:
A value of zero for the time or count disables the interrupt coalescing in the
corresponding direction.
MMC/SDCard Driver
-----------------
The MMC/SDCard driver (uSDHC module) is provided by the `libbsd`. It is
initialized according to the device tree. Pin re-configuration according to
the serial clock frequency is not supported. Data transfers are extremely
slow. This is probably due to the missing DMA support.
Caveats
-------