diff --git a/configs/qemu-riscv64_smode_defconfig b/configs/qemu-riscv64_smode_defconfig
index a7b0e06a..99f8111a 100644
--- a/configs/qemu-riscv64_smode_defconfig
+++ b/configs/qemu-riscv64_smode_defconfig
@@ -14,3 +14,8 @@ CONFIG_CMD_NVEDIT_EFI=y
 CONFIG_OF_PRIOR_STAGE=y
 CONFIG_SYS_RELOC_GD_ENV_ADDR=y
 CONFIG_DM_MTD=y
+CONFIG_USE_BOOTARGS=y
+CONFIG_BOOTARGS="console=ttyS0 earlycon"
+CONFIG_NR_CPUS=32
+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 7d38ec9a..b120537d 100644
--- a/configs/sifive_fu540_defconfig
+++ b/configs/sifive_fu540_defconfig
@@ -13,3 +13,6 @@ CONFIG_DISPLAY_BOARDINFO=y
 CONFIG_OF_SEPARATE=y
 CONFIG_SYS_RELOC_GD_ENV_ADDR=y
 CONFIG_DM_MTD=y
+CONFIG_USE_BOOTARGS=y
+CONFIG_BOOTARGS="console=ttySIF0 earlycon"
+CONFIG_NR_CPUS=32