Sascha Hauer writes:

quoted

This suffers from the same bug mpc83xx_restart has.  We can NOT do an  
ioremap inside the restart function.  We may get called from  
interrupt context on a panic and will not be able to do the ioremap 
().  The simplest thing is to do the mapping earlier in an init call  
and save the pointer, its not perfect, but better.

I'm beginning to hate this whole pseudo OF thing for embedded systems.

Not being able to ioremap at interrupt time has absolutely _nothing_
to do with the device tree.

All we need to know is that we have a mpc52xx processor.

... until we get a system with a mpc52xx and some extra stuff.  Then
you say "OK, we just need a boardinfo_t" and then we get 57 different
variants of boardinfo_t and then we're back in the mess that arch/ppc
got into.

Paul.