diff --git a/common/cmd_bootm.c b/common/cmd_bootm.c
index 94ddac37c..0ef3e5ebc 100644
--- a/common/cmd_bootm.c
+++ b/common/cmd_bootm.c
@@ -105,10 +105,6 @@ extern int do_reset (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[]);
 typedef int boot_os_fn (int flag, int argc, char *argv[],
 			bootm_headers_t *images); /* pointers to os/initrd/fdt */
 
-#define CONFIG_BOOTM_LINUX 1
-#define CONFIG_BOOTM_NETBSD 1
-#define CONFIG_BOOTM_RTEMS 1
-
 #ifdef CONFIG_BOOTM_LINUX
 extern boot_os_fn do_bootm_linux;
 #endif
diff --git a/include/config_defaults.h b/include/config_defaults.h
new file mode 100644
index 000000000..08b6edec4
--- /dev/null
+++ b/include/config_defaults.h
@@ -0,0 +1,17 @@
+/*
+ * config_defaults.h - sane defaults for everyone
+ *
+ * Copyright (c) 2009 Analog Devices Inc.
+ *
+ * Licensed under the GPL-2 or later.
+ */
+
+#ifndef _CONFIG_DEFAULTS_H_
+#define _CONFIG_DEFAULTS_H_
+
+/* Support bootm-ing different OSes */
+#define CONFIG_BOOTM_LINUX 1
+#define CONFIG_BOOTM_NETBSD 1
+#define CONFIG_BOOTM_RTEMS 1
+
+#endif
diff --git a/mkconfig b/mkconfig
index 27d9f2bac..0f7f13e3a 100755
--- a/mkconfig
+++ b/mkconfig
@@ -101,9 +101,11 @@ for i in ${TARGETS} ; do
 	echo "#define CONFIG_MK_${i} 1" >>config.h ;
 done
 
-echo "#define CONFIG_BOARDDIR board/$BOARDDIR" >>config.h
-
-echo "#include <configs/$1.h>" >>config.h
-echo "#include <asm/config.h>" >>config.h
+cat << EOF >> config.h
+#define CONFIG_BOARDDIR board/$BOARDDIR
+#include <config_defaults.h>
+#include <configs/$1.h>
+#include <asm/config.h>
+EOF
 
 exit 0