There appears to be some PID boards where the flash is not recognized.
We have one of those in the farm. See "Please update PID boards in farm"
thread on ecc-test.
The board in question is a BE configured board without the necessary lakrids
to make it work properly in BE mode. Not worth bothering about (and I couldn't
make sense of the flash's behavior, so it may not even be possible. YMMV).