powerpc/mpc8xxx: Add x4 DDR device support
On selected platforms, x4 DDR devices can be supported. Using x4 devices may
lower the performance, but generally they are available for higher density.
Tested on MT36JSF2G72PZ-1G9E1 RDIMM.
Signed-off-by: York Sun <yorksun@freescale.com>
diff --git a/arch/powerpc/include/asm/fsl_ddr_dimm_params.h b/arch/powerpc/include/asm/fsl_ddr_dimm_params.h
index ffe4db8..bd312ad 100644
--- a/arch/powerpc/include/asm/fsl_ddr_dimm_params.h
+++ b/arch/powerpc/include/asm/fsl_ddr_dimm_params.h
@@ -26,6 +26,7 @@
unsigned int primary_sdram_width;
unsigned int ec_sdram_width;
unsigned int registered_dimm;
+ unsigned int device_width; /* x4, x8, x16 components */
/* SDRAM device parameters */
unsigned int n_row_addr;
