Hello. Recently I tried to install Mac OS X DP4 using configs from DP3 and formatting the drive in Mac OS 9.2. But, when I try to bootup, it starts the booting, but after "ADB Present:c" it hangs and start saying "still waiting for root device" until I shutdown QEMU. One time it even gave me Kernel Panic. I also tried booting with unformatted disk, but still the same.
For future people getting the "still waiting for root device" error: that error is almost always due to -prom-env "boot-device=<device>:<partition>,\\:tbxi" pointing to somewhere without an EFI image that will boot on the hardware configuration selected.