powerpc/mpc8xxx: Fix DDR code for empty first DIMM slot and enable DQS_en
Check second DIMM slot in case the first one is empty. Honor DQS enable option for SDRAM mode register. Signed-off-by: NYork Sun <yorksun@freescale.com> Signed-off-by: NKumar Gala <galak@kernel.crashing.org>
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