diff --git a/arch/arm/mach-rockchip/rk3036-board-spl.c b/arch/arm/mach-rockchip/rk3036-board-spl.c
index b897ffe..110d06d 100644
--- a/arch/arm/mach-rockchip/rk3036-board-spl.c
+++ b/arch/arm/mach-rockchip/rk3036-board-spl.c
@@ -7,30 +7,12 @@
 #include <debug_uart.h>
 #include <asm/io.h>
 #include <asm/arch-rockchip/bootrom.h>
-#include <asm/arch-rockchip/grf_rk3036.h>
-#include <asm/arch-rockchip/hardware.h>
 #include <asm/arch-rockchip/sdram_rk3036.h>
 #include <asm/arch-rockchip/timer.h>
-#include <asm/arch-rockchip/uart.h>
-
-#define GRF_BASE	0x20008000
-
-#define DEBUG_UART_BASE	0x20068000
 
 void board_init_f(ulong dummy)
 {
-#ifdef EARLY_DEBUG
-	struct rk3036_grf * const grf = (void *)GRF_BASE;
-	/*
-	 * NOTE: sd card and debug uart use same iomux in rk3036,
-	 * so if you enable uart,
-	 * you can not boot from sdcard
-	 */
-	rk_clrsetreg(&grf->gpio1c_iomux,
-		     GPIO1C3_MASK << GPIO1C3_SHIFT |
-		     GPIO1C2_MASK << GPIO1C2_SHIFT,
-		     GPIO1C3_UART2_SOUT << GPIO1C3_SHIFT |
-		     GPIO1C2_UART2_SIN << GPIO1C2_SHIFT);
+#ifdef CONFIG_DEBUG_UART
 	debug_uart_init();
 #endif
 	rockchip_timer_init();
diff --git a/arch/arm/mach-rockchip/rk3036/Makefile b/arch/arm/mach-rockchip/rk3036/Makefile
index 20d28f7..299fc50 100644
--- a/arch/arm/mach-rockchip/rk3036/Makefile
+++ b/arch/arm/mach-rockchip/rk3036/Makefile
@@ -10,4 +10,5 @@
 obj-y += syscon_rk3036.o
 endif
 
+obj-y += rk3036.o
 obj-y += sdram_rk3036.o
diff --git a/arch/arm/mach-rockchip/rk3036/rk3036.c b/arch/arm/mach-rockchip/rk3036/rk3036.c
new file mode 100644
index 0000000..481af8a
--- /dev/null
+++ b/arch/arm/mach-rockchip/rk3036/rk3036.c
@@ -0,0 +1,38 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * (C) Copyright 2019 Rockchip Electronics Co., Ltd
+ */
+#include <asm/io.h>
+#include <asm/arch-rockchip/grf_rk3036.h>
+#include <asm/arch-rockchip/hardware.h>
+
+#ifdef CONFIG_DEBUG_UART_BOARD_INIT
+void board_debug_uart_init(void)
+{
+#define GRF_BASE	0x20008000
+	struct rk3036_grf * const grf = (void *)GRF_BASE;
+	enum {
+		GPIO1C3_SHIFT		= 6,
+		GPIO1C3_MASK		= 3 << GPIO1C3_SHIFT,
+		GPIO1C3_GPIO		= 0,
+		GPIO1C3_MMC0_D1,
+		GPIO1C3_UART2_SOUT,
+
+		GPIO1C2_SHIFT		= 4,
+		GPIO1C2_MASK		= 3 << GPIO1C2_SHIFT,
+		GPIO1C2_GPIO		= 0,
+		GPIO1C2_MMC0_D0,
+		GPIO1C2_UART2_SIN,
+	};
+	/*
+	 * NOTE: sd card and debug uart use same iomux in rk3036,
+	 * so if you enable uart,
+	 * you can not boot from sdcard
+	 */
+	rk_clrsetreg(&grf->gpio1c_iomux,
+		     GPIO1C3_MASK << GPIO1C3_SHIFT |
+		     GPIO1C2_MASK << GPIO1C2_SHIFT,
+		     GPIO1C3_UART2_SOUT << GPIO1C3_SHIFT |
+		     GPIO1C2_UART2_SIN << GPIO1C2_SHIFT);
+}
+#endif
diff --git a/configs/kylin-rk3036_defconfig b/configs/kylin-rk3036_defconfig
index 083cca9..f6a1874 100644
--- a/configs/kylin-rk3036_defconfig
+++ b/configs/kylin-rk3036_defconfig
@@ -12,7 +12,6 @@
 CONFIG_SPL_STACK_R_ADDR=0x80000
 CONFIG_DEBUG_UART=y
 CONFIG_NR_DRAM_BANKS=1
-CONFIG_SPL_STACK_R_ADDR=0x80000
 # CONFIG_ANDROID_BOOT_IMAGE is not set
 CONFIG_DEFAULT_FDT_FILE="rk3036-kylin.dtb"
 # CONFIG_DISPLAY_CPUINFO is not set