Errors during single user UNIX startup

Question

When I boot into single user mode on the iMac G5, I get two errors.
AppleU3: Warning: Platform-chip-fault expected, but not found
and...
CSRHID Transition Driver:: Probe: -s
CHRHID Transition Driver:: Probe booting in single user .. do not match
Anyone know what they mean?
iMac 20 G5   Mac OS X (10.4.8)  

Answer 1

It does continue to boot. No noticable problems. I got this reply on the iMac G5 forum.
As I understand it, wynmoroftn, the Platform-chip-fault message is not usually something you need to worry about unless it is accompanied by other symptoms.
see "Electric Sheep's" post at http://forums.macosxhints.com/archive/index.php/t-52901.html
In the electronics world, 'U' is the prefix designation for any integrated circuit on a PCB.
Some of these integrated circuits will include a pin-out for a FAULT signal, which feeds back to the CPU or some other logic whenever a fault condition arises.
In your case, you probably have a revision of the U3 chip which doesn't have a FAULT pin.
// If we have a chip fault interrupt, install the handler and enable notifications. It's normal for
// this to fail on some platforms, since U3.1 and U3.2 don't have a chip fault pin.
Thus, the logged failure is normal.
It would seem that from the source code, U3 (or U4), is related to the PMU (or is the PMU).
As far as the CSRHID messages go, I'm pretty sure this refers to the CSR "Human Interface Driver" associated with the computer's bluetooth hardware.
It may simply be that it is not implemented when the computer is booted in Single User mode.
Cheers
Rod