diff --git a/configs/qemu-riscv64_smode_defconfig b/configs/qemu-riscv64_smode_defconfig
index 33776f03..42ec49eb 100644
--- a/configs/qemu-riscv64_smode_defconfig
+++ b/configs/qemu-riscv64_smode_defconfig
@@ -13,3 +13,7 @@ CONFIG_CMD_NVEDIT_EFI=y
 # CONFIG_CMD_MII is not set
 CONFIG_OF_PRIOR_STAGE=y
 CONFIG_SYS_RELOC_GD_ENV_ADDR=y
+CONFIG_USE_BOOTARGS=y
+CONFIG_BOOTARGS="console=ttyS0 earlycon"
+CONFIG_USE_PREBOOT=y
+CONFIG_PREBOOT="cp.l ${fdtcontroladdr} ${fdt_addr_r} 0x10000;"
diff --git a/configs/sifive_fu540_defconfig b/configs/sifive_fu540_defconfig
index 790da976..dff48057 100644
--- a/configs/sifive_fu540_defconfig
+++ b/configs/sifive_fu540_defconfig
@@ -11,3 +11,5 @@ CONFIG_DISPLAY_CPUINFO=y
 CONFIG_DISPLAY_BOARDINFO=y
 CONFIG_OF_PRIOR_STAGE=y
 CONFIG_SYS_RELOC_GD_ENV_ADDR=y
+CONFIG_USE_BOOTARGS=y
+CONFIG_BOOTARGS="console=ttySIF0 earlycon"