Index: tools/ew.py
===================================================================
--- tools/ew.py	(revision 0195374eb8a8178bc4c180c978bd786dc68ea369)
+++ tools/ew.py	(revision a91d71982386caa12384a03fa70c36a61e3b0f7c)
@@ -95,5 +95,5 @@
 		return 'system-ppc', '-m 256'
 	elif platform == 'sparc64':
-		return 'system-sparc64', ''
+		return 'system-sparc64', '--prom-env boot-args="console=devices/\\hw\\pci0\\00:03.0\\com1\\a"'
 
 def hdisk_mk():