Switch nsim_700_defconfig to dwuart for consistent uart settings
for all nSIM configurations.

Signed-off-by: Eugeniy Paltsev <eugeniy.palt...@synopsys.com>
---
 arch/arc/boot/dts/nsim_700.dts      | 20 +++++++++++---------
 arch/arc/configs/nsim_700_defconfig |  8 ++++++--
 2 files changed, 17 insertions(+), 11 deletions(-)

diff --git a/arch/arc/boot/dts/nsim_700.dts b/arch/arc/boot/dts/nsim_700.dts
index 63dbaab1247d..ae9bc21fe11b 100644
--- a/arch/arc/boot/dts/nsim_700.dts
+++ b/arch/arc/boot/dts/nsim_700.dts
@@ -14,11 +14,11 @@
        interrupt-parent = <&core_intc>;
 
        chosen {
-               bootargs = "earlycon=arc_uart,mmio32,0xc0fc1000,115200n8 
console=ttyARC0,115200n8 print-fatal-signals=1";
+               bootargs = "earlycon=uart8250,mmio32,0xf0000000,115200n8 
console=ttyS0,115200n8 print-fatal-signals=1";
        };
 
        aliases {
-               serial0 = &arcuart0;
+               serial0 = &uart0;
        };
 
        fpga {
@@ -41,13 +41,15 @@
                        #interrupt-cells = <1>;
                };
 
-               arcuart0: serial@c0fc1000 {
-                       compatible = "snps,arc-uart";
-                       reg = <0xc0fc1000 0x100>;
-                       interrupts = <5>;
-                       clock-frequency = <80000000>;
-                       current-speed = <115200>;
-                       status = "okay";
+               uart0: serial@f0000000 {
+                       compatible = "ns16550a";
+                       reg = <0xf0000000 0x2000>;
+                       interrupts = <24>;
+                       clock-frequency = <50000000>;
+                       baud = <115200>;
+                       reg-shift = <2>;
+                       reg-io-width = <4>;
+                       no-loopback-test = <1>;
                };
 
                ethernet@c0fc2000 {
diff --git a/arch/arc/configs/nsim_700_defconfig 
b/arch/arc/configs/nsim_700_defconfig
index 9b2653b0b349..5c488140f537 100644
--- a/arch/arc/configs/nsim_700_defconfig
+++ b/arch/arc/configs/nsim_700_defconfig
@@ -41,8 +41,12 @@ CONFIG_LXT_PHY=y
 # CONFIG_INPUT_MOUSE is not set
 # CONFIG_SERIO is not set
 # CONFIG_LEGACY_PTYS is not set
-CONFIG_SERIAL_ARC=y
-CONFIG_SERIAL_ARC_CONSOLE=y
+CONFIG_SERIAL_8250=y
+CONFIG_SERIAL_8250_CONSOLE=y
+CONFIG_SERIAL_8250_NR_UARTS=1
+CONFIG_SERIAL_8250_RUNTIME_UARTS=1
+CONFIG_SERIAL_8250_DW=y
+CONFIG_SERIAL_OF_PLATFORM=y
 # CONFIG_HW_RANDOM is not set
 # CONFIG_HWMON is not set
 # CONFIG_HID is not set
-- 
2.21.0

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