[geeks] PowerPC 850 knowlege sought

[Jay Monkman]

On Sun, Jan 25, 2009 at 12:13:54PM -0500, der Mouse wrote:
> 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 haven't used the MPC850, but I used other parts in that family. What
is the trouble?

The IMMR is used to set the base address of all the internal memory
mapped registers. Its default value is determined by configuration
set during power on or hard reset.