Add support for Seagate BlackArmor NAS220

Add support for Seagate BlackArmor NAS220

Signed-off-by: Evgeni Dobrev <evgeni@studio-punkt.com>
diff --git a/configs/nas220_defconfig b/configs/nas220_defconfig
new file mode 100644
index 0000000..5a79c51
--- /dev/null
+++ b/configs/nas220_defconfig
@@ -0,0 +1,3 @@
+CONFIG_ARM=y
+CONFIG_KIRKWOOD=y
+CONFIG_TARGET_NAS220=y