Here are my findings:

When compiling the kernel I need to have FPU_EMULATE enabled even when 
using -msoft-float. Otherwise I get a kernel panic at boot. FPSP is not 
required, though.

DDB seems to be required. disabling it causes a panic at boot.

The network would not work correctly with the following comment OUT

# NuBus support 
nubus0 at mainbus?

The kernel would boot, and the network would *appear* to come up. But 
networking would not really work.

-m68040 worked fine -O3 worked fine.



Commenting out the following caused the build to fail:

# On-board serial interface 
zsc0    at obio?
zstty*  at zsc? channel ?

I am cross-building under 1.6.2 (plus some updates) x86. I am compiling 
for a PB520c.



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