Index: tools/mkuimage.py
===================================================================
--- tools/mkuimage.py	(revision 814752508c9a361c0614c3827238008185400fb7)
+++ tools/mkuimage.py	(revision 774c143f6d1f9de99d06cbeb8518d2c506cb1402)
@@ -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