It looks like there's a lot of confusion as to what open-source hardware is, so we made a godawful flowchart to help make it more clear what it means.
we probably should have put the vendor datasheets one earlier on, but at the moment we kinda feel like it's the hardest one.
if your device includes, for instance
- a camera
- an ARM SOC
- an FPGA
- a Wi-Fi transceiver
- a cellular modem
then it's often as good as impossible to find one with a datasheet available without NDA.
to make matters worse, there are some components, especially camera modules, whose datasheets are available, but complete garbage, with all the important parameters listed as "TBD" or "-", and many sections just missing completely
it's an open question as to whether devices using those components qualify as open-source hardware. they probably do in most cases, but it's always variable.
in our book, PCB layout and routing info, as well as component datasheets (and user manuals, where applicable) are actually dramatically more important than foss firmware. it's one thing if a device has a proprietary blob baked into the configuration memory of some component, but quite another - and much more immediately relevant to the owner-hacker of the device - if there's nothing available to tell where everything is on the board.