FYI, I don't know if this helps but on the RM4100 original bios there is a small flash utility built in. We have discovered that we can access this through the memory hole and flash the bios via serial (but the bios image still needs to be on the drive).
Another very useful thing to do with SerialICE would be a "test harness" mode where we run the memory enable sequence and return control to SerialICE, and then test memory.
This would be very cool indeed. So you mean, it would stop at raminit, hand control over to user to manually enter raminit, and then continue on?
I think the uses of SerialICE are really just becoming apparent. It certainly wins the Cool Hack of The Year Award for this project, if not all projects :-)
BY FAR, the best bios unvaler I have ever seen :-)