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The O2/O2+ is Silicon Graphics's successor of the Indy workstation. It comes in several versions with R5000, RM5271, RM7000, R10000 or R12000 processors. The firmware is a 32-bit ARCS.

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 in Linux. Support for R1x000 based O2 systems need more work, see below.

Currently supported devices include:

  • PS/2 keyboard and mouse
  • Framebuffer, see GBE for more information
  • Serial ports
  • Parallel port
  • Audio in/out, since Alsa 1.0.17
  • SCSI (Adaptec 7880) and booting from a hard drive works using arcboot or ARCLoad.
  • Integrated 10/100 Base-T ethernet
  • PCI slot (Some USB cards are known to work ok)

Experimental support


Some experimental work has been done on the VICE engine.

  • Experimental (and old) patches for VICE [1] and [2].


The combination of R1x000 speculative execution feature and lack of hardware cache coherency in IP32, causes problems that need special workarounds in kernel (and also possibly GCC). The kernel portion has not been achieved yet. Discussion of the R10k issue (TODO: write up in more detail here)

The work done for IP28 support might also help the R10K O2. Patches for kernel and gcc can be found at http://www.pfrst.de/download.html.



  • is working good

PCI boards known to be working when plugged in O2's PCI slot

  • ...

a PCI-usb should be useful in order to plug an external usb-disk