[PATCH] powerpc/shared/flash/flash.c: Erase required only if changing 0 to 1

[Nick Withers]

Hi all,

The attached patch makes a (n admittedly not very pretty, but minimal)
change to powerpc/shared/flash/flash.c so that it won't try to erase a
flash segment just because the existing contents aren't all-1s. Now, so
long as no bits would have to be changed from a 0 to a 1 an erase is not
necessarily required.

With this change I've been able to use the spansionFlash driver to bring
up a JFFS2 file-system, reading and writing files, which failed without.
-- 
Nick Withers

Embedded Systems Programmer
Department of Nuclear Physics, Research School of Physics and Engineering
The Australian National University (CRICOS: 00120C)
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