Most RK260X players uses almost the same firmwares, with small changes only. So I would say that companies dont create their own firmwares from scratch. They must be well equiped by rockchip company with developing resources.In terms of USB, rockchip has abilities to handle all the usb devices, but there is no drivers for that, although its possible to write them.Rockchip SDK provides config files for compiling in which you decide which features need to be included (line in recording, fm radio, even CDROM!). So companies probably do little job with their firmwares.
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