diff --git a/config/sources/families/include/rockchip64_common.inc b/config/sources/families/include/rockchip64_common.inc
index 7d7a779776..06734238e9 100644
--- a/config/sources/families/include/rockchip64_common.inc
+++ b/config/sources/families/include/rockchip64_common.inc
@@ -6,7 +6,7 @@ BOOTENV_FILE='rockchip-default.txt'
 UBOOT_TARGET_MAP=";;idbloader.bin uboot.img trust.bin"
 BOOTDELAY=0
 OVERLAY_PREFIX='rockchip'
-SERIALCON=${SERIALCON:-'ttyFIQ0:1500000'}
+SERIALCON=${SERIALCON:=$([ $BRANCH == "legacy" ] && echo "ttyFIQ0:1500000" || echo "ttyS2:1500000")}
 GOVERNOR="ondemand"
 CPUMAX="2016000"
 CPUMIN="600000"