diff --git a/doc/README.fsl-ddr b/doc/README.fsl-ddr
index 9c2224f..6e4f6e9 100644
--- a/doc/README.fsl-ddr
+++ b/doc/README.fsl-ddr
@@ -32,38 +32,41 @@
 1. In board header file(e.g.MPC8572DS.h), add default interleaving setting
    under "CONFIG_EXTRA_ENV_SETTINGS", like:
 	#define CONFIG_EXTRA_ENV_SETTINGS				\
-	 "memctl_intlv_ctl=2\0"						\
+	 "hwconfig=fsl_ddr:ctlr_intlv=bank"			\
 	 ......
 
 2. Run u-boot "setenv" command to configure the memory interleaving mode.
    Either numerical or string value is accepted.
 
   # disable memory controller interleaving
-  setenv memctl_intlv_ctl
+  setenv hwconfig "fsl_ddr:ctlr_intlv=null"
 
   # cacheline interleaving
-  setenv memctl_intlv_ctl 0 or setenv memctl_intlv_ctl cacheline
+  setenv hwconfig "fsl_ddr:ctlr_intlv=cacheline"
 
   # page interleaving
-  setenv memctl_intlv_ctl 1 or setenv memctl_intlv_ctl page
+  setenv hwconfig "fsl_ddr:ctlr_intlv=page"
 
   # bank interleaving
-  setenv memctl_intlv_ctl 2 or setenv memctl_intlv_ctl bank
+  setenv hwconfig "fsl_ddr:ctlr_intlv=bank"
 
   # superbank
-  setenv memctl_intlv_ctl 3 or setenv memctl_intlv_ctl superbank
+  setenv hwconfig "fsl_ddr:ctlr_intlv=superbank"
 
   # disable bank (chip-select) interleaving
-  setenv ba_intlv_ctl
+  setenv hwconfig "fsl_ddr:bank_intlv=null"
 
   # bank(chip-select) interleaving cs0+cs1
-  setenv ba_intlv_ctl 0x40 or setenv ba_intlv_ctl cs0_cs1
+  setenv hwconfig "fsl_ddr:bank_intlv=cs0_cs1"
 
   # bank(chip-select) interleaving cs2+cs3
-  setenv ba_intlv_ctl 0x20 or setenv ba_intlv_ctl cs2_cs3
+  setenv hwconfig "fsl_ddr:bank_intlv=cs2_cs3"
 
   # bank(chip-select) interleaving (cs0+cs1) and (cs2+cs3)  (2x2)
-  setenv ba_intlv_ctl 0x60 or setenv ba_intlv_ctl cs0_cs1_and_cs2_cs3
+  setenv hwconfig "fsl_ddr:bank_intlv=cs0_cs1_and_cs2_cs3"
 
   # bank(chip-select) interleaving (cs0+cs1+cs2+cs3) (4x1)
-  setenv ba_intlv_ctl 0x04 or setenv ba_intlv_ctl cs0_cs1_cs2_cs3
+  setenv hwconfig "fsl_ddr:bank_intlv=cs0_cs1_cs2_cs3"
+
+  The above memory controller interleaving and bank interleaving can be mixed. The syntax is
+  setenv hwconfig "fsl_ddr:ctlr_intlv=cacheline,bank_intlv=cs0_cs1"