[geeks] PowerPC 850 knowlege sought

[der Mouse]

I'm working with some code for the PowerPC 850.  But documentation
seems rather thin on the ground, and, in particular, SPR #638, the
IMMR, is giving me trouble.  I don't know what it does, and the
documentation I've been able to find lists it with a reference to a
section that doesn't exist in the file (the file in question is
http://fnapcf.fnal.gov/~ron/doc/motorola/PPC-see/850um_2.pdf; page 4-9
mentions the IMMR with a reference to section 10.4.1, but as far as I
can see there is no section 10.anything in the file).

I've been trying to STFW, but haven't found anything of use.  (Using
the Web is difficult and unpleasant for me, so this is not that
surprising.)  Is there any kind soul who could point me to the rest of
the documentation of which the above 850um_2.pdf is only a part, or for
that amtter any documentation on the IMMR and what it points to (I've
found hints indicating that it points to where something important
appears in the memory map), or, failing that, just explain it to me?

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