[OpenBIOS] OpenSolaris starts to live on SPARC64

[Tarl Neustaedter]

On 2010-4-3 6:24 PM, Artyom Tarasenko wrote:
> [...]
> How is SBUS connected to the IO-MMU? Directly or through a PCI bridge?
> Quick google search didn't help me to find it. I only found that in the Russian
> sparc32 PCI machine (Elbrus-90)  SBUS is connected through a PCI-bridge.
> If that's the case in early Ultras too, OBP probably won't be able to tell us
> much via the serial port connected to the SBUS.
>    

SBUS long pre-dated PCI. The original UltraSPARC machines (Ultra/1, 
Ultra/2) were SBUS machines, which used a SYSIO bridge instead of 
PSYCHO. I think the root bus on those machines was UPA (a 
Sun-proprietary bus). Once Sun's PCI machines came on strong, SBUS 
pretty much went away.