iBook won't boot from firewire disk

[Michael George]

In a previous thread I sought help on creating a bootable firewire 
drive.  Using Bill Fink's and Richard McLain's HOWTOs and 1:1 advice 
from Gavin Hemphill, I now have a firewire disk booting YDL 3.0.1.

Great Joy!

I created this drive with both SMP and UP kernels and initrds (though 
the latter could probably have been shared) so that I can boot my iBook 
(14", purchased May 2002) and our company XServe (1GHz model, purchased 
June 2002) from it.

However, when I plug the drive into the iBook, power up the drive, and 
power up the iBook with the opt key pressed, it will give me the 
graphical boot screen, but the firewire disk is not on it like it is on 
my PowerMac.

I would expect that if I didn't genericise the config files correctly, 
it would have trouble booting, but since I cannot even get it to the 
first-stage bootloader, I suspect something else is amiss.

Anyone out there have an external FW disk that boots on an iBook?  
Anyone with a FW disk that boots on a PowerMac, but *not* an iBook?

Thanks!
-Michael