[stusmall]

It is possible but there is no financial incentive to do so. There is no user expectation to install your own OS on a phone like there is a PC. Its just cheaper and easier to develop and test a product if you can assume the hardware/software are in lockstep and you completely control both.

Also you have to keep in mind, the driver situation in the embedded world can get dark fast. Manufacturers wanting to keep datasheets secret, drivers that are just pass-throughs so user space daemons can write to hardware so they don't have to comply with the GPL. It gets weird fast, and why bother with that mess if it won't win any more customers than just a few hardcore hackers and power users.