It's me, again...
I have a bubinga 405 reference platform, and it behaves very well with the PROM from IBM, but I am unable to get u-boot running on it.
It takes an exception to either 0700 or 0200 after executing very early in the bootloader. The ppc405ep_init function just starts, and actually causes a machine exception on the 5th assy line... andi. R6,r5,8 which looks completely valid to me... At this point in the game, icache and dcache have been invalidated, and not much else has been done.
If someone has worked with the RISCwatch on this board, would you please send me your startup.cmd file?
Any ideas would be welcome...
Regards,
Bruce Boettjer Sr Hardware Design Engineer Momentum Computer 1815 Aston Ave Suite 107 Carlsbad, CA 92008 (760)-431-8663