Hello,

I'm trying to understand the logic behind the allocation of the OF_buf. 
  As best I can tell, ofppc/locore.S and macppc/locore.S both just grab 
some space sitting at the end of the .data segment.

Unfortunatly PSIM exactly allocates the data/bss segment and the OF_buf 
ends up with an unmapped VM address.  I get the feeling that the code is 
assuming that the stack will be placed directly after .bss.

confused,
Andrew