diff --git a/include/configs/km/keymile-common.h b/include/configs/km/keymile-common.h
index 7a01705..4f606a0 100644
--- a/include/configs/km/keymile-common.h
+++ b/include/configs/km/keymile-common.h
@@ -126,12 +126,29 @@
 	"netdev=eth0\0"
 #endif
 
-#ifndef CONFIG_KM_UBI_PARTITION_NAME
-#define CONFIG_KM_UBI_PARTITION_NAME	"ubi0"
-#endif
-#ifndef CONFIG_KM_UBI_LINUX_MTD_NAME
-#define CONFIG_KM_UBI_LINUX_MTD_NAME	"ubi0"
-#endif
+#ifndef CONFIG_KM_UBI_PARTITION_NAME_BOOT
+#define CONFIG_KM_UBI_PARTITION_NAME_BOOT	"ubi0"
+#endif /* CONFIG_KM_UBI_PARTITION_NAME_BOOT */
+
+#ifndef CONFIG_KM_UBI_PARTITION_NAME_APP
+/* one flash chip only called boot */
+/* boot: CONFIG_KM_UBI_PARTITION_NAME_BOOT */
+# define CONFIG_KM_UBI_LINUX_MTD					\
+	"ubi.mtd=" CONFIG_KM_UBI_PARTITION_NAME_BOOT
+# define CONFIG_KM_DEV_ENV_FLASH_BOOT_UBI				\
+	"ubiattach=ubi part " CONFIG_KM_UBI_PARTITION_NAME_BOOT "\0"
+#else /* CONFIG_KM_UBI_PARTITION_NAME_APP */
+/* two flash chips called boot and app */
+/* boot: CONFIG_KM_UBI_PARTITION_NAME_BOOT */
+/* app:  CONFIG_KM_UBI_PARTITION_NAME_APP */
+# define CONFIG_KM_UBI_LINUX_MTD					\
+	"ubi.mtd=" CONFIG_KM_UBI_PARTITION_NAME_BOOT " "		\
+	"ubi.mtd=" CONFIG_KM_UBI_PARTITION_NAME_APP
+# define CONFIG_KM_DEV_ENV_FLASH_BOOT_UBI				\
+	"ubiattach=if test ${boot_bank} -eq 0; then; "			\
+	"ubi part " CONFIG_KM_UBI_PARTITION_NAME_BOOT "; else; "	\
+	"ubi part " CONFIG_KM_UBI_PARTITION_NAME_APP "; fi\0"
+#endif /* CONFIG_KM_UBI_PARTITION_NAME_APP */
 
 #define xstr(s)	str(s)
 #define str(s)	#s
@@ -173,7 +190,7 @@
 		" console=" CONFIG_KM_CONSOLE_TTY ",${baudrate}"	\
 		" mem=${kernelmem} init=${init}"			\
 		" phram.phram=phvar,${varaddr}," xstr(CONFIG_KM_PHRAM)	\
-		" ubi.mtd=" CONFIG_KM_UBI_LINUX_MTD_NAME " "		\
+		" " CONFIG_KM_UBI_LINUX_MTD " "				\
 		CONFIG_KM_DEF_BOOT_ARGS_CPU				\
 		"\0"							\
 	"addpanic="							\
@@ -199,10 +216,9 @@
 #define CONFIG_KM_DEF_ENV_FLASH_BOOT					\
 	"cramfsaddr=" xstr(CONFIG_KM_CRAMFS_ADDR) "\0"			\
 	"cramfsloadkernel=cramfsload ${load_addr_r} uImage\0"		\
-	"ubiattach=ubi part " CONFIG_KM_UBI_PARTITION_NAME "\0"		\
 	"ubicopy=ubi read "xstr(CONFIG_KM_CRAMFS_ADDR)			\
 			" bootfs${boot_bank}\0"				\
-	""
+	CONFIG_KM_DEV_ENV_FLASH_BOOT_UBI
 
 /*
  * constants
diff --git a/include/configs/km/km82xx-common.h b/include/configs/km/km82xx-common.h
index 02a82a6..2c763bb 100644
--- a/include/configs/km/km82xx-common.h
+++ b/include/configs/km/km82xx-common.h
@@ -73,7 +73,7 @@
 		"128k(env),"						\
 		"128k(envred),"						\
 		"3072k(free),"						\
-		"-(" CONFIG_KM_UBI_PARTITION_NAME ")"
+		"-(" CONFIG_KM_UBI_PARTITION_NAME_BOOT ")"
 
 /*
  * Default environment settings
diff --git a/include/configs/km/km83xx-common.h b/include/configs/km/km83xx-common.h
index 06ecb8a..2c266fa 100644
--- a/include/configs/km/km83xx-common.h
+++ b/include/configs/km/km83xx-common.h
@@ -15,13 +15,18 @@
 #include "keymile-common.h"
 #include "km-powerpc.h"
 
-#define MTDIDS_DEFAULT		"nor0=boot"
-#define MTDPARTS_DEFAULT	"mtdparts="			\
+#ifndef MTDIDS_DEFAULT
+# define MTDIDS_DEFAULT	"nor0=boot"
+#endif /* MTDIDS_DEFAULT */
+
+#ifndef MTDPARTS_DEFAULT
+# define MTDPARTS_DEFAULT	"mtdparts="			\
 	"boot:"							\
 		"768k(u-boot),"					\
 		"128k(env),"					\
 		"128k(envred),"					\
-		"-(" CONFIG_KM_UBI_PARTITION_NAME ")"
+		"-(" CONFIG_KM_UBI_PARTITION_NAME_BOOT ");"
+#endif /* MTDPARTS_DEFAULT */
 
 #define CONFIG_MISC_INIT_R
 /*
diff --git a/include/configs/km/km_arm.h b/include/configs/km/km_arm.h
index c73a10c..011f838 100644
--- a/include/configs/km/km_arm.h
+++ b/include/configs/km/km_arm.h
@@ -229,11 +229,15 @@
 
 #define FLASH_GPIO_PIN			0x00010000
 
-#define MTDIDS_DEFAULT		"nand0=orion_nand"
-/* test-only: partitioning needs some tuning, this is just for tests */
-#define MTDPARTS_DEFAULT	"mtdparts="				\
-	"orion_nand:"							\
-		"-(" CONFIG_KM_UBI_PARTITION_NAME ")"
+#ifndef MTDIDS_DEFAULT
+# define MTDIDS_DEFAULT		"nand0=orion_nand"
+#endif /* MTDIDS_DEFAULT */
+
+#ifndef MTDPARTS_DEFAULT
+# define MTDPARTS_DEFAULT	"mtdparts="			\
+	"orion_nand:"						\
+		"-(" CONFIG_KM_UBI_PARTITION_NAME_BOOT ");"
+#endif /* MTDPARTS_DEFAULT */
 
 #define	CONFIG_KM_DEF_ENV_UPDATE					\
 	"update="							\
@@ -257,7 +261,6 @@
 	""
 
 #if defined(CONFIG_SYS_NO_FLASH)
-#define CONFIG_KM_UBI_PARTITION_NAME   "ubi0"
 #undef	CONFIG_FLASH_CFI_MTD
 #undef	CONFIG_JFFS2_CMDLINE
 #endif