[FS#653] RAID not working on Netgear WNDR4700

[LEDE Bugs]

The following task has a new comment added:

FS#653 - RAID not working on Netgear WNDR4700
User who did this - Christian Lamparter (chunkeey)

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@diizzyy

I've included both version. the version with mdadm 4.0 is prefixed with mdadm4-...
As for "mdadm: unexpected failure opening /dev/md1". It will still happen with 4.0
if the kernel doesn't have CONFIG_DIRECT_IO set. :-/
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More information can be found at the following URL:
https://bugs.lede-project.org/index.php?do=details&task_id=653#comment2250