om-gtao1: use += for image types

diff --git a/conf/machine/om-gta01.conf b/conf/machine/om-gta01.conf
index 190d1d1..46bd42f 100644 (file)
--- a/conf/machine/om-gta01.conf
+++ b/conf/machine/om-gta01.conf
@@ -36,7 +36,7 @@ MACHINE_EXTRA_RRECOMMENDS = "\
 ROOT_FLASH_SIZE = "60"
 
 # extra jffs2 tweaks
-IMAGE_FSTYPES ?= "jffs2"
+IMAGE_FSTYPES += "jffs2"
 EXTRA_IMAGECMD_jffs2 = "--little-endian --eraseblock=0x4000 --pad -n"
 
 # build / upload tools