Index: tools/mkuimage.py
===================================================================
--- tools/mkuimage.py	(revision d06c4aec8f992876da4273345236cb81a72b4d4e)
+++ tools/mkuimage.py	(revision ecd1a0aa0746649b810764037fa03dca950f5122)
@@ -120,5 +120,5 @@
 	header.start_addr = start_addr	# Address of entry point
 	header.data_crc = data_crc
-	header.os = 5			# Linux
+	header.os = 2			# NetBSD
 	header.arch = 2			# ARM
 	header.img_type = 2		# Kernel