diff --git a/configs/defconfig b/configs/defconfig
index c0db7c3..c47e560 100644
--- a/configs/defconfig
+++ b/configs/defconfig
@@ -5,3 +5,4 @@
 CONFIG_HWBASE_TIMER_CLOCK_GETTIME	= y
 CONFIG_HWBASE_TIMER_MUTIME		=
 CONFIG_HWBASE_POSIX_FILE		=
+CONFIG_HWBASE_DEFAULT_MMCONF		= 16\#f000_0000\#
diff --git a/configs/posix b/configs/posix
index 183a5b5..f75f6e7 100644
--- a/configs/posix
+++ b/configs/posix
@@ -5,3 +5,4 @@
 CONFIG_HWBASE_TIMER_CLOCK_GETTIME	= y
 CONFIG_HWBASE_TIMER_MUTIME		=
 CONFIG_HWBASE_POSIX_FILE		= y
+CONFIG_HWBASE_DEFAULT_MMCONF		= 0