[Balloon] more than 256Mb kernel support

We've always had more than 256Mb RAM but not been able to make one
kernel that would access it all on both >256Mb and <=256Mb builds.

This patch
http://git.kernel.org/?p=linux/kernel/git/marex/pxa-linux-2.6.git;a=commit;h=9ee18023466d30e3847a77c82a1e776fb3cf02fc

enables exactly that for another pxa270 board.

I _think_ it's exactly what we need and is all of 10 lines. But I
could be wrong.


Wookey
--
Principal hats: Linaro, Emdebian, Wookware, Balloonboard, ARM
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