Hi Chris,

> Cool! That was a lot of info. I don't understand all of it since I
> don't know much about ABIs and compilers, but you did a great job of
> explaining it! For future reference:

Thanks! If you let me know what parts you didn't understand, please let
me know and I will attempt to expand/clarify. 

> Here's an Open Firmware 2.0f1 Beige G3/DT/233 with the "B rev" ROM
> DIMM load-base is 600000 and
> real-base is F00000 and
> 384 MB of RAM, reports relative addressing mode
> 
> 0 > dev /memory .properties  ok
> name                    memory
> device_type             memory
> reg                     00000000  18000000
> available               00000000 00F00000 01000000 17000000
> 
> and a PDQ PowerBook G3 with 512 MB of RAM, same real and load base
> settings. Open Firmware 2.0.1 (reports relative addressing mode)
> 
> reg			00000000  10000000
> available		00000000 00F00000 01000000 0F000000

In both case, as we see, there is a discontinuity in the available
memory. There are 15M of memory available starting at 0x0, and then xM
of memory available at 16M. Both add up to the "reg" value. In the
second case, only 256M of memory are showing up in OF, but all 384M show
up in the first case.

Can you post the values after

setenv real-base ffffffff

so that I could see where OF gets loaded in a default real-base?

thanks,
tim