Generally speaking, is that Forth quicker than C?
Not generally, no. It can be, but that's not the point.
I hope to know, if we write OpenBIOS by C, is it
Possibly. But the project is about writing an IEEE 1275-1994 standard
compliance firmware, not about booting as fast as possible. If that is
what you're looking for, you should check out the coreboot project at
If you're looking for IEEE 1275-1994 compliant firmware in C, you might
also be interested in CodeGen's SmartFirmware.
BTW, which program language does used to write FCode
The OpenBIOS implementation is written in Forth.