... is HelenOS. Although I was not able to boot the official 0.4 and 0.6.0 releases due to known problems with SILO (or OBP/Hypervisor), the current version works just fine:
Note the nice reddish prompt. No other OS bootable under sun4v QEMU sparc64 emulation has something similar out of the box!
|HelenOS 0.6.0 revision 2521 under QEMU/sun4v|