[PATCH 04/11 v2] [POWERPC] Remove and replace uses of PPC_MEMSTART with memstart_addr

[Paul Mackerras]

Kumar Gala writes:

> For the sub-arches that support relocatable interrupt vectors (book-e) its
> reasonable to have memory start at a non-zero physical address.  For those
> cases use the variable memstart_addr instead of the #define PPC_MEMSTART
> since the only uses of PPC_MEMSTART are for initialization and in the
> future we can set memstart_addr at runtime to have a relocatable kernel.

In those cases, is it still true that the kernel sits at the start of
the usable memory, or might there be usable memory before _stext?
In other words, is PAGE_OFFSET == KERNELBASE still true or not?

Paul.