diff --git a/target/linux/ramips/image/Makefile b/target/linux/ramips/image/Makefile
index 3d4d64933b..88b20fa3d8 100644
--- a/target/linux/ramips/image/Makefile
+++ b/target/linux/ramips/image/Makefile
@@ -158,14 +158,14 @@ mtdlayout_dir300b1=192k(u-boot)ro,64k(devdata)ro,64k(devconf)ro,896k(kernel),288
 mtd_dir300b1_kernel_part_size=917504
 mtd_dir300b1_rootfs_part_size=2949120
 define BuildFirmware/DIR300B1
-	$(call BuildFirmware/Generic,$(1),$(2),board=$(3) $(call mkmtd/phys,$(mtdlayout_dir300b1)),$(mtd_dir300b1_kernel_part_size),$(mtd_dir300b1_rootfs_part_size))
+	$(call BuildFirmware/Generic,$(1),$(2),$(call mkcmdline,$(3),ttyS1,57600) $(call mkmtd/phys,$(mtdlayout_dir300b1)),$(mtd_dir300b1_kernel_part_size),$(mtd_dir300b1_rootfs_part_size))
 	mkwrgimg -s $(4) -d /dev/mtdblock/2 \
 		-i $(call sysupname,$(1),$(2)) \
 		-o $(call imgname,$(1),$(2))-factory.bin
 endef
 
 define BuildFirmware/DIR300B1/initramfs
-	$(call BuildFirmware/Generic/initramfs,$(1),$(2),board=$(3) $(call mkmtd/phys,$(mtdlayout_dir300b1)),$(mtd_dir300b1_kernel_part_size),$(mtd_dir300b1_rootfs_part_size))
+	$(call BuildFirmware/Generic/initramfs,$(1),$(2),$(call mkcmdline,$(3),ttyS1,57600) $(call mkmtd/phys,$(mtdlayout_dir300b1)),$(mtd_dir300b1_kernel_part_size),$(mtd_dir300b1_rootfs_part_size))
 endef
 
 define BuildFirmware/Edimax