The O2 Workstation is based around the CRIME, MACE, VICE, and GBE ASICs. CRIME ASIC is the main system ASIC which interfaces the MIPS cpu, memory system and the I/O system in the MACE ASIC. CRIME ASIC also contains the 3D gfx rendering engine which renders to main system memory -- part of which is used as the frame buffer which is DMA'ed to a video connector using the GBE ASIC. A MACE chip is used to provide legacy device support (serial, parallel, video, rtc...). VICE ASIC is used to process video streams and images stored in memory.
Currently only R5000 based IP32 (O2) systems are well supported. The combination of R1x000 speculative execution feature and lack of hardware cache coherency in IP32, causes problems that need special workarounds implemented in kernel. Unfortunately noone have done it yet.