RDA8810PL is a potential osmocomBB target due to the Orange Pi 2G-IOT board's Android SDK ball of sources seemsto come with some modem sources and the RDA cross compiling environment (seems to be MIPS) for it.
The MIPS part is interesting as the short from datasheet for the RDA8810PL SoC mentions that the modem has two "RDA RISC Core 32x32 bits" cores.
One for System CPU(XCUP) and one Baseband CPU (BCPU)

It also states that