--- a/tools/mkimage.h
+++ b/tools/mkimage.h
@@ -43,9 +43,9 @@
 #endif /* MKIMAGE_DEBUG */
 
 #define MKIMAGE_TMPFILE_SUFFIX		".tmp"
-#define MKIMAGE_MAX_TMPFILE_LEN		256
+#define MKIMAGE_MAX_TMPFILE_LEN		2048
 #define MKIMAGE_DEFAULT_DTC_OPTIONS	"-I dts -O dtb -p 500"
-#define MKIMAGE_MAX_DTC_CMDLINE_LEN	512
+#define MKIMAGE_MAX_DTC_CMDLINE_LEN	2048
 #define MKIMAGE_DTC			"dtc"   /* assume dtc is in $PATH */
 
 /*