powerpc: fix pci window initialization to work with > 4GB DRAM
The existing code has a few errors that need to be fixed in order to support large RAM sizes. Fix those, and add a comment to make it clearer. Signed-off-by: NBecky Bruce <becky.bruce@freescale.com> Acked-by: NKumar Gala <galak@kernel.crashing.org>
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