--- a/target/linux/ath79/mikrotik/config-default
+++ b/target/linux/ath79/mikrotik/config-default
@@ -38,3 +38,4 @@
CONFIG_WATCHDOG_CORE=y
CONFIG_ZLIB_DEFLATE=y
CONFIG_ZLIB_INFLATE=y
+CONFIG_CMDLINE="rootfstype=squashfs,jffs1 8250.nr_uarts=0"