diff --git a/target/linux/au1000/au1500/config-default b/target/linux/au1000/au1500/config-default
new file mode 100644
index 000000000..0289d967b
--- /dev/null
+++ b/target/linux/au1000/au1500/config-default
@@ -0,0 +1,5 @@
+CONFIG_DMA_NONCOHERENT=y
+# CONFIG_MIPS_DB1550 is not set
+CONFIG_MIPS_MTX1=y
+CONFIG_NEED_DMA_MAP_STATE=y
+CONFIG_WDT_MTX1=y
diff --git a/target/linux/au1000/au1550/config-default b/target/linux/au1000/au1550/config-default
new file mode 100644
index 000000000..2c641b8ca
--- /dev/null
+++ b/target/linux/au1000/au1550/config-default
@@ -0,0 +1,4 @@
+CONFIG_DMA_COHERENT=y
+CONFIG_MIPS_DB1550=y
+CONFIG_MIPS_DISABLE_OBSOLETE_IDE=y
+# CONFIG_MIPS_MTX1 is not set
diff --git a/target/linux/au1000/au1500/config-3.3 b/target/linux/au1000/config-3.3
similarity index 96%
rename from target/linux/au1000/au1500/config-3.3
rename to target/linux/au1000/config-3.3
index 8a1a53a10..f7b3fd4f9 100644
--- a/target/linux/au1000/au1500/config-3.3
+++ b/target/linux/au1000/config-3.3
@@ -26,7 +26,6 @@ CONFIG_CRC16=y
 CONFIG_CSRC_R4K_LIB=y
 # CONFIG_DEBUG_ZBOOT is not set
 CONFIG_DECOMPRESS_LZMA=y
-CONFIG_DMA_NONCOHERENT=y
 CONFIG_DUMMY=m
 CONFIG_EARLY_PRINTK=y
 CONFIG_ELF_CORE=y
@@ -91,11 +90,9 @@ CONFIG_MIPS_AU1X00_ENET=y
 # CONFIG_MIPS_DB1000 is not set
 # CONFIG_MIPS_DB1200 is not set
 # CONFIG_MIPS_DB1300 is not set
-# CONFIG_MIPS_DB1550 is not set
 # CONFIG_MIPS_GPR is not set
 CONFIG_MIPS_L1_CACHE_SHIFT=5
 # CONFIG_MIPS_MACHINE is not set
-CONFIG_MIPS_MTX1=y
 CONFIG_MIPS_MT_DISABLED=y
 # CONFIG_MIPS_PB1100 is not set
 # CONFIG_MIPS_PB1500 is not set
@@ -106,7 +103,6 @@ CONFIG_MODULE_FORCE_UNLOAD=y
 # CONFIG_MTD_CFI_INTELEXT is not set
 # CONFIG_MTD_COMPLEX_MAPPINGS is not set
 CONFIG_MTD_PHYSMAP=y
-CONFIG_NEED_DMA_MAP_STATE=y
 CONFIG_NEED_PER_CPU_KM=y
 CONFIG_NO_GENERIC_PCI_IOPORT_MAP=y
 CONFIG_PAGEFLAGS_EXTENDED=y
@@ -135,7 +131,6 @@ CONFIG_SYS_SUPPORTS_LITTLE_ENDIAN=y
 CONFIG_SYS_SUPPORTS_ZBOOT=y
 CONFIG_USB_ARCH_HAS_XHCI=y
 CONFIG_USB_SUPPORT=y
-CONFIG_WDT_MTX1=y
 CONFIG_XZ_DEC=y
 CONFIG_ZLIB_INFLATE=m
 CONFIG_ZONE_DMA_FLAG=0