powerpc/mpc8xxx: Set inactive csn_bnds to 0xffffffff

When chip select interleaving is enabled, cs0_bnds is used for address
binding. Other csn_bnds are not used. When two controllers interleaving is
enabled, cs0_bnds of both controllers are used, other csn_bnds are not.
However, the unused csn_bnds may be used internally for calculating
addresses for calibration. Setting those registers to 0 may confuse
controllers in some cases. Instead, setting them to 0xffffffff together
with normal LAWs will guarantee the address is not mapped to DDR.

Signed-off-by: York Sun <yorksun@freescale.com>
diff --git a/arch/powerpc/cpu/mpc8xxx/ddr/main.c b/arch/powerpc/cpu/mpc8xxx/ddr/main.c
index 7a8636d..c35405d 100644
--- a/arch/powerpc/cpu/mpc8xxx/ddr/main.c
+++ b/arch/powerpc/cpu/mpc8xxx/ddr/main.c
@@ -504,7 +504,13 @@
 				fsl_ddr_cfg_regs_t *reg = &ddr_reg[i];
 				if (reg->cs[j].config & 0x80000000) {
 					unsigned int end;
-					end = reg->cs[j].bnds & 0xFFF;
+					/*
+					 * 0xfffffff is a special value we put
+					 * for unused bnds
+					 */
+					if (reg->cs[j].bnds == 0xffffffff)
+						continue;
+					end = reg->cs[j].bnds & 0xffff;
 					if (end > max_end) {
 						max_end = end;
 					}