[RFC 3/3] powerpc: Add DTS file for the Motorola PrPMC2800 platform

[Yoder Stuart-B08248]

> > "existing"
> > The value of this property defines the regions of virtual address
> > space managed by the MMU in whose package this property is defined
> > without regard to whether or not these regions are currently in use.
> > The encodings of virt and len are MMU-specific.
> > 
> > Have a look at the PowerPC binding to find out about that specific
> > encoding.

the PowerPC binding defines this--

 + 5.1.7. Memory Management Unit properties
 + 
 + To aid a client in taking over the translation mechanism and
 + still interact with Open Firmware (via the client interface),
 + the client needs to know what translations have been established by
 + Open Firmware. The following standard property shall exist within
 + the package to which the mmu property of the /chosen package refers.
 + 
 + "translations"
 + 
 +    This property, consisting of sets of translations, defines the
 +    currently active translations that have been established by Open
 +    Firmware (e.g., using map). Each set has the following format:
 +     (virt size phys mode )
 + 
 + Each value is encoded as with encode-int.

The "mode" field seems to be undefined.

So would firmware need to define all phys to virt mappings in 
the "translations" property or just the interesting ones-- i.e
uart/console and i2c?

Stuart