diff --git a/configs/nsim_700be_defconfig b/configs/nsim_700be_defconfig
index 40f7ec7..61eea91 100644
--- a/configs/nsim_700be_defconfig
+++ b/configs/nsim_700be_defconfig
@@ -2,13 +2,13 @@
 CONFIG_CPU_BIG_ENDIAN=y
 CONFIG_TARGET_NSIM=y
 CONFIG_SYS_TEXT_BASE=0x81000000
-CONFIG_DEBUG_UART_BASE=0xc0fc1000
+CONFIG_DEBUG_UART_BASE=0xf0000000
 CONFIG_DEBUG_UART_CLOCK=70000000
 CONFIG_SYS_CLK_FREQ=70000000
 CONFIG_DEBUG_UART=y
 CONFIG_BOOTDELAY=3
 CONFIG_USE_BOOTARGS=y
-CONFIG_BOOTARGS="console=ttyARC0,115200n8"
+CONFIG_BOOTARGS="console=ttyS0,115200n8"
 CONFIG_SYS_PROMPT="nsim# "
 # CONFIG_CMD_SETEXPR is not set
 CONFIG_OF_CONTROL=y
@@ -17,6 +17,6 @@
 CONFIG_SYS_RELOC_GD_ENV_ADDR=y
 CONFIG_DM=y
 CONFIG_DM_SERIAL=y
-CONFIG_DEBUG_ARC_SERIAL=y
-CONFIG_ARC_SERIAL=y
+CONFIG_DEBUG_UART_SHIFT=2
+CONFIG_SYS_NS16550=y
 CONFIG_USE_PRIVATE_LIBGCC=y