OpenSolaris is an operating system.
We're currently evaluating how to boot OpenSolaris via coreboot using the GRUB2 payload.
OpenSolaris has moved to multiboot, so GRUB2 contains all necessary parts including the ufs and zfs support.
The instructions on Shudong Zhou's blog don't work anymore, because Sun changed the boot mechanism (again).
what should work:
multiboot /platform/i86pc/kernel/unix /platform/i86pc/kernel/unix module /boot/x86.microroot /boot/x86.microroot (that filename might be different)
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In case this is not legally possible: