mpc85xx: Implement workaround for erratum DDR-A003
Erratum DDR-A003 requires workaround to correctly set RCW10 for registered DIMM. Also adding polling after enabling DDR controller to ensure completion. Signed-off-by: NYork Sun <yorksun@freescale.com> Signed-off-by: NKumar Gala <galak@kernel.crashing.org>
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