powerpc/mpc8xxx: fix workaround for errata DDR111 and DDR134
The fix for errata workaround is to avoid covering physical address 0xff000000 to 0xffffffff during the implementation. Signed-off-by: NYork Sun <yorksun@freescale.com> Signed-off-by: NKumar Gala <galak@kernel.crashing.org>
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