Index: arch/arm/dts/rk3399-rock-pi-4.dtsi
--- arch/arm/dts/rk3399-rock-pi-4.dtsi.orig
+++ arch/arm/dts/rk3399-rock-pi-4.dtsi
@@ -17,7 +17,7 @@
 	};
 
 	chosen {
-		stdout-path = "serial2:1500000n8";
+		stdout-path = "serial2:115200n8";
 	};
 
 	clkin_gmac: external-gmac-clock {
