All those SoC's name their peripheral buses for their own, like aubus
of Alchemy and siobio of SiByte, etc.  I don't think there's much
point of doing this.  I think having a common name helps read code.

My idea is, ocio(4) (on-chip I/O) for on-chip peripherals, and obio(4)
(on-board I/O) , which is already widely used, for on-board devices
mapped in physical memory space.

Masao