This is a part of few pull requests for DRTIO functionality. They have been broken up to allow easier code review overall. They're identical in contents to drtio_port branch.
This PR includes libio library ported from mainline ARTIQ, which is mostly used by the drtio code in libboard_artiq.
It can be merged anytime as it doesn't have external dependencies.
Any feedback and suggestions are welcome.
No due date set.
This pull request currently doesn't have any dependencies.
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