I have some hardware that is neither supported by linux nor freebsd, but I'd like to take up the challenge and try to get it working. My first problem though is choosing with os to develop it for since both have completely different apis. Now it seems to me that I should be able to write a compatibility layer for certain subsystems that are probably similar between the two kernels. For example, I'd expect the usb and pci subsystems both have very similar apis since they are both based on the same low-level specifications. In some cases, simple macros may be all that are needed so there will be no slow-down, and most other cases probably won't need very much code and might be just inline functions. I'd like to do this in a way that many device drivers can use this api to help make them more portable between kernels. Now some parts may require very drastic code differences and need to be written for each architecture, but if this can be minimized it can help keep devices supported to the same degree. I'd be intrested in any thoughts on this. Has anyone does anything similar to this before or are there any device drivers in freebsd that share a common code base with linux drivers? I'm thinking that that might be the case with the maestro driver since it's GPLed.
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