Most devices are basically unusable because they lack documentation and specification. It can be painstainkingly and slowly reengineered, but when is that done,

Most devices are basically unusable because they lack documentation and specification. It can be painstainkingly and slowly reengineered, but when is that done, if ever? I think the easier way is to spend money on devices with proper documentation. More and more the most important question I have when I consider to buy a device is whether the mainline kernel is supported and can be installed. If not, I move on.