Strange mapping at 0xffc00000

[Paul Mackerras]

> I have started using the 2.2.5 kernel from 2.1.24 previously, and have found
> a
> new 4 Meg mapping up at 0xffc00000 that was not there before.  This mapping
> is
> setup in arch/ppc/kernel/pmac_setup.c, in routine pmac_setup_arch with the
> following line:
> 
>         __ioremap(0xffc00000, 0x400000, pgprot_val(PAGE_READONLY));

This is the Mac ROM.  I put that in when I was doing some experiments
to do with emulating the Mac hardware and running macos in user mode.

Paul.

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