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tiny4412 --Uboot移植(4) 串口

时间:2019-02-16 15:24:11      阅读:323      评论:0      收藏:0      [点我收藏+]

标签:||   msu   style   oid   代码   inux   void   reg   选择   

开发环境:win10 64位 + VMware12 + Ubuntu14.04 32位

工具链:linaro提供的gcc-linaro-6.1.1-2016.08-x86_64_arm-linux-gnueabi

要移植的u-boot版本:u-boot-2016-11

Tiny4412开发板硬件版本为

  底板:  Tiny4412SDK 1312B

  核心板:Tiny4412 - 1306

 

1,原理图

查看tiny4412SDK-1312B -Schematic.pdf

技术图片

 

技术图片

 

 

可看出,底板使用UART0作为外接串口

 

2、uart0初始化步骤

  1. 选择UART的时钟源
  2. 将所涉及的UART通道管脚设为UART功能
  3. 设置波特率:UBRDIVn寄存器(UART BAUD RATE DIVISOR)、UFRACVALn寄存器
  4. 设置传输格式:ULCONn寄存器(UART LINE CONTROL)
  5. 设置UART工作模式:UCONn寄存器(UART CONTROL)
  6. UFCONn寄存器(UART FIFO CONTROL)、UFSTATn寄存器(UART FIFO STATUS)

 

3、使用Tiny4412 Debug 串口uart0代码设置


diff --git a/arch/arm/dts/exynos4412-tiny4412.dts b/arch/arm/dts/exynos4412-tiny
index 4810202..3e057dc 100644
--- a/arch/arm/dts/exynos4412-tiny4412.dts
+++ b/arch/arm/dts/exynos4412-tiny4412.dts
@@ -14,74 +14,16 @@
        model = "Tiny4412 based on Exynos4412";
        compatible = "samsung,tiny4412", "samsung,exynos4412";
 
-       aliases {
-               i2c0 = "/i2c@13860000";
-               i2c1 = "/i2c@13870000";
-               i2c2 = "/i2c@13880000";
-               i2c3 = "/i2c@13890000";
-               i2c4 = "/i2c@138a0000";
-               i2c5 = "/i2c@138b0000";
-               i2c6 = "/i2c@138c0000";
-               i2c7 = "/i2c@138d0000";
-               serial0 = "/serial@13800000";
-               console = "/serial@13810000";
-               mmc2 = "/sdhci@12530000";
-               mmc4 = "/dwmmc@12550000";
-       };
-
-       i2c@13860000 {
-               samsung,i2c-sda-delay = <100>;
-               samsung,i2c-slave-addr = <0x10>;
-               samsung,i2c-max-bus-freq = <100000>;
-               status = "okay";
+  chosen {
+      stdout-path = "serial0";
+    };
 
+  aliases {
+      serial0 = "/serial@13800000";
+      console = "/serial@13800000";
        };
 
-       serial@13810000 {
+  serial0:serial@13810000 {
                status = "okay";
        };
-
-       sdhci@12510000 {
-               status = "disabled";
-       };
-
-       sdhci@12520000 {
-               status = "disabled";
-       };
-
-       sdhci@12530000 {
-               samsung,bus-width = <4>;
-               samsung,timing = <1 2 3>;
-               cd-gpios = <&gpk2 2 0>;
-       };
-
-       sdhci@12540000 {
-               status = "disabled";
-       };
-
-       dwmmc@12550000 {
-               samsung,bus-width = <8>;
-               samsung,timing = <2 1 0>;
-               samsung,removable = <0>;
-               fifoth_val = <0x203f0040>;
-               bus_hz = <400000000>;
-               div = <0x3>;
-               index = <4>;
-       };
-
-       ehci@12580000 {
-               compatible = "samsung,exynos-ehci";
-               reg = <0x12580000 0x100>;
-               #address-cells = <1>;
-               #size-cells = <1>;
-               phy {
-                       compatible = "samsung,exynos-usb-phy";
-                       reg = <0x125B0000 0x100>;
-               };
-       };
-
-       emmc-reset {
-               compatible = "samsung,emmc-reset";
-               reset-gpio = <&gpk1 2 0>;
-       };
 };

diff
--git a/arch/arm/mach-exynos/Makefile b/arch/arm/mach-exynos/Makefile index 5889802..5575adf 100644 --- a/arch/arm/mach-exynos/Makefile +++ b/arch/arm/mach-exynos/Makefile @@ -15,7 +15,7 @@ ifdef CONFIG_SPL_BUILD obj-$(CONFIG_EXYNOS5) += clock_init_exynos5.o obj-$(CONFIG_EXYNOS5) += dmc_common.o dmc_init_ddr3.o obj-$(CONFIG_EXYNOS4210)+= dmc_init_exynos4.o clock_init_exynos4.o -obj-$(CONFIG_EXYNOS4412)+= dmc_init_exynos4412.o clock_init_exynos4412.o +obj-$(CONFIG_EXYNOS4412)+= dmc_init_exynos4.o clock_init_exynos4412.o obj-y += spl_boot.o tzpc.o obj-y += lowlevel_init.o

diff
--git a/arch/arm/mach-exynos/lowlevel_init.c b/arch/arm/mach-exynos/lowleve index 1e090fd..c69be57 100644 --- a/arch/arm/mach-exynos/lowlevel_init.c +++ b/arch/arm/mach-exynos/lowlevel_init.c @@ -218,9 +218,15 @@ int do_lowlevel_init(void) #ifdef CONFIG_DEBUG_UART #if (defined(CONFIG_SPL_BUILD) && defined(CONFIG_SPL_SERIAL_SUPPORT)) || !defined(CONFIG_SPL_BUILD) - exynos_pinmux_config(PERIPH_ID_UART3, PINMUX_FLAG_NONE); - debug_uart_init(); + + #ifdef TINY4412 + exynos_pinmux_config(PERIPH_ID_UART0, PINMUX_FLAG_NONE); + #else + exynos_pinmux_config(PERIPH_ID_UART3, PINMUX_FLAG_NONE); + #endif + debug_uart_init(); #endif + printascii("UART0 init ... OK !!!\n\r"); #endif mem_ctrl_init(actions & DO_MEM_RESET); tzpc_init();

diff
--git a/configs/tiny4412_defconfig b/configs/tiny4412_defconfig index ccc9fab..25c6bfb 100644 --- a/configs/tiny4412_defconfig +++ b/configs/tiny4412_defconfig @@ -37,3 +37,14 @@ CONFIG_OF_CONTROL=y #CONFIG_G_DNL_MANUFACTURER="Samsung" #CONFIG_G_DNL_VENDOR_NUM=0x04e8 #CONFIG_G_DNL_PRODUCT_NUM=0x6601 + +#DEBUG UART +# +CONFIG_DEBUG_UART=y +CONFIG_SPL_SERIAL_SUPPORT=y +CONFIG_SPL_GPIO_SUPPORT=y +CONFIG_DEBUG_UART_S5P=y +CONFIG_DEBUG_UART_BASE=0x13800000 +CONFIG_DEBUG_UART_CLOCK=100000000 + +#

 

tiny4412 --Uboot移植(4) 串口

标签:||   msu   style   oid   代码   inux   void   reg   选择   

原文地址:https://www.cnblogs.com/chu-yi/p/10387604.html

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