The OrangePi looks like an interesting ARM board, so I plan on adding support for it once the Allwinner H3 support is upstreamed to kernel.org and u-boot. I don't know when that would be, but there has been a patch set created for the Kernel already. I checked Linux 4.3-rc1 and H3 support is not there.
The company behind the Orange Pi has a programme to provide free boards for projects, provided that there are enough votes.
Click here to vote
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You need to create an account first. The web site isn't the fastest, unfortunately!