openwrt/target/linux/ppc44x/patches/100-openwrt_dts_cmdline.patch

--- a/arch/powerpc/boot/dts/taishan.dts
+++ b/arch/powerpc/boot/dts/taishan.dts
@@ -423,5 +423,6 @@
 
 	chosen {
 		linux,stdout-path = "/plb/opb/serial@40000300";
+		bootargs = "console=ttyS1,115200 root=/dev/mtdblock1 rootfstype=squashfs noinitrd init=/etc/preinit";
 	};
 };