[FS#646] MMC/SD - mount/read/write not possible -> kernel errors

[LEDE Bugs]

The following task has a new comment added:

FS#646 - MMC/SD - mount/read/write not possible -> kernel errors
User who did this - Mathias Kresin (mkresin)

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Please test the latest snapshot. Some sd/mmc card related fixes were committed.
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More information can be found at the following URL:
https://bugs.openwrt.org/index.php?do=details&task_id=646#comment4556