Re: [PATCH 1/2] powerpc/85xx: fix problem that prevents PHYS_64BIT from configurable

On 02/17/2012 08:19 PM, Benjamin Herrenschmidt wrote:

On Fri, 2012-02-17 at 18:56 -0600, Scott Wood wrote:

quoted

Yes, or maybe make it "default y", and/or require an "I know what I'm
doing" option to be set for it to be unset if a board otherwise wants it.

The ability to turn it off is potentially useful for any board, since
the address map is determined by boot software which can be changed, but
we shouldn't make it too easy to fail to select it for boards that
normally require it.

Don't we have CONFIG_EMBEDDED to make that sort of option visible ?

OK, so:

config WANT_PHYS_64BIT
select PHYS_64BIT if !EMBEDDED

config PHYS_64BIT
default y if WANT_PHYS_64BIT

...and "select WANT_PHYS_64BIT" on boards that normally have 36-bit
address maps?

What about 86xx?  It looks like PHYS_64BIT can't be enabled if it's
sharing a kernel image with 82xx or 83xx (why these specific SoCs but
not 603 in general?).

-Scott