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随意的标题一
最近碰到个需求,原来am5728的console是在uart3上面的,然后需要改到uart8,一般来说这个并没有什么难度,但是看了下,有点懵逼,因为麻烦的是uboot串口默认1-6是随意切换的,但是后面7往后就没有那么简单了.于是还是写下来记录一下.捡一些重要的说一下.
主要参照的是ti论坛内的一个回复修改的,但是当前写博客的时候,我已经懒得去找那个链接了…
代码
- 修改dtb切换输出串口,并使能串口8
diff --git a/arch/arm/dts/am57xx-beagle-x15-common.dtsi b/arch/arm/dts/am57xx-beagle-x15-common.dtsi
index 49aeecd..6af99c3 100644
--- a/arch/arm/dts/am57xx-beagle-x15-common.dtsi
+++ b/arch/arm/dts/am57xx-beagle-x15-common.dtsi
@@ -24,7 +24,7 @@};chosen {
- stdout-path = &uart3;
+ stdout-path = &uart8;};memory@0 {
@@ -587,3 +587,7 @@status = "okay";};};
+
+&uart8 {
+ status = "okay";
+};diff --git a/arch/arm/dts/am57xx-idk-common.dtsi b/arch/arm/dts/am57xx-idk-common.dtsi
index fa5a078..561fe30 100644
--- a/arch/arm/dts/am57xx-idk-common.dtsi
+++ b/arch/arm/dts/am57xx-idk-common.dtsi
@@ -15,7 +15,7 @@};chosen {
- stdout-path = &uart3;
+ stdout-path = &uart8;};vmain: fixedregulator-vmain {
@@ -416,6 +416,9 @@no-1-8-v;/delete-property/ mmc-hs200-1_8v;};
+&uart8 {
+ status = "okay";
+};&dcan1 {status = "okay";
当初没有仔细看是哪个dts文件,所以索性都改了.
- 不了解
reg-shift = <2>;};-&uart3 {
+&uart8 {u-boot,dm-spl;reg-shift = <2>;};
这里并不是很了解,待我完了之后去看下代码理解一下.
- 打开串口时钟
diff --git a/arch/arm/include/asm/omap_common.h b/arch/arm/include/asm/omap_common.h
index 5710136..b96c1bf 100644
--- a/arch/arm/include/asm/omap_common.h
+++ b/arch/arm/include/asm/omap_common.h
@@ -284,6 +284,7 @@ struct prcm_regs {u32 cm_l4per_i2c5_clkctrl;u32 cm_l4per_uart5_clkctrl;u32 cm_l4per_uart6_clkctrl;
+ u32 cm_l4per_uart8_clkctrl;u32 cm_l4sec_clkstctrl;u32 cm_l4sec_staticdep;u32 cm_l4sec_dynamicdep;
diff --git a/arch/arm/mach-omap2/clocks-common.c b/arch/arm/mach-omap2/clocks-common.c
index 93c4c6f..8d68962 100644
--- a/arch/arm/mach-omap2/clocks-common.c
+++ b/arch/arm/mach-omap2/clocks-common.c
@@ -805,7 +805,7 @@ static void setup_clocks_for_console(void)MODULE_CLKCTRL_MODULEMODE_SW_EXPLICIT_EN <<MODULE_CLKCTRL_MODULEMODE_SHIFT);- clrsetbits_le32((*prcm)->cm_l4per_uart3_clkctrl,
+ clrsetbits_le32((*prcm)->cm_l4per_uart8_clkctrl,MODULE_CLKCTRL_MODULEMODE_MASK,MODULE_CLKCTRL_MODULEMODE_SW_EXPLICIT_EN <<MODULE_CLKCTRL_MODULEMODE_SHIFT);
diff --git a/arch/arm/mach-omap2/omap5/prcm-regs.c b/arch/arm/mach-omap2/omap5/prcm-regs.c
index b5f1d70..aff2896 100644
--- a/arch/arm/mach-omap2/omap5/prcm-regs.c
+++ b/arch/arm/mach-omap2/omap5/prcm-regs.c
@@ -970,6 +970,7 @@ struct prcm_regs const dra7xx_prcm = {.cm_l4per_uart3_clkctrl = 0x4a009850,.cm_l4per_uart4_clkctrl = 0x4a009858,.cm_l4per_uart5_clkctrl = 0x4a009870,
+ .cm_l4per_uart8_clkctrl = 0x4a0098e0,.cm_l4sec_clkstctrl = 0x4a009880,.cm_l4sec_staticdep = 0x4a009884,.cm_l4sec_dynamicdep = 0x4a009888,
- 切换cmdline里面传给kernel的参数让kernel也在uart8输出
diff --git a/include/configs/am57xx_evm.h b/include/configs/am57xx_evm.h
index cf5cacd..b59a139 100644
--- a/include/configs/am57xx_evm.h
+++ b/include/configs/am57xx_evm.h
@@ -27,7 +27,7 @@#define CONFIG_ENV_OFFSET_REDUND (CONFIG_ENV_OFFSET + CONFIG_ENV_SIZE)#define CONFIG_SYS_REDUNDAND_ENVIRONMENT-#define CONSOLEDEV "ttyO2"
+#define CONSOLEDEV "ttyO7"#define CONFIG_SYS_NS16550_COM1 UART1_BASE /* Base EVM has UART0 */#define CONFIG_SYS_NS16550_COM2 UART2_BASE /* UART2 */#define CONFIG_SYS_NS16550_COM3 UART3_BASE /* UART3 */
--
大概是这么一个节奏.
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