From f1561fa65631d5d5250c8f25b73bb6f970efe746 Mon Sep 17 00:00:00 2001
From: carbon <carbon@milkv.io>
Date: Tue, 5 Sep 2023 09:49:03 +0800
Subject: [PATCH] set pin 4/5 default function to UART4

---
 .../cv1800b_milkv_duo_sd/dts_riscv/cv1800b_milkv_duo_sd.dts   | 4 ++++
 .../cv180x/cv1800b_milkv_duo_sd/u-boot/cvi_board_init.c       | 4 ++++
 2 files changed, 8 insertions(+)

diff --git a/build/boards/cv180x/cv1800b_milkv_duo_sd/dts_riscv/cv1800b_milkv_duo_sd.dts b/build/boards/cv180x/cv1800b_milkv_duo_sd/dts_riscv/cv1800b_milkv_duo_sd.dts
index 2de78fcd9..25b5d7e83 100644
--- a/build/boards/cv180x/cv1800b_milkv_duo_sd/dts_riscv/cv1800b_milkv_duo_sd.dts
+++ b/build/boards/cv180x/cv1800b_milkv_duo_sd/dts_riscv/cv1800b_milkv_duo_sd.dts
@@ -16,6 +16,10 @@
 	};
 };
 
+&uart4 {
+	status = "okay";
+};
+
 / {
 
 };
diff --git a/build/boards/cv180x/cv1800b_milkv_duo_sd/u-boot/cvi_board_init.c b/build/boards/cv180x/cv1800b_milkv_duo_sd/u-boot/cvi_board_init.c
index c860cf0a4..1101546ce 100644
--- a/build/boards/cv180x/cv1800b_milkv_duo_sd/u-boot/cvi_board_init.c
+++ b/build/boards/cv180x/cv1800b_milkv_duo_sd/u-boot/cvi_board_init.c
@@ -20,6 +20,10 @@ int cvi_board_init(void)
 	PINMUX_CONFIG(SD1_D2, PWM_5);
 	PINMUX_CONFIG(SD1_D1, PWM_6);
 
+	// UART 4
+	PINMUX_CONFIG(SD1_GPIO1, UART4_TX);
+	PINMUX_CONFIG(SD1_GPIO0, UART4_RX);
+
 	// SPI
 	PINMUX_CONFIG(SD1_CLK, SPI2_SCK);
 	PINMUX_CONFIG(SD1_CMD, SPI2_SDO);