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AM623: Changing console from UART0 to UART2

z js
Prodigy 40 points
Part Number: AM623

Dear TI teams,

I changed the default terminal debugging serial port uart0 to uart2 and started the system. I found that both uart0 and uart2 had log output. Can you help analyze the reason?

Thanks!

After startup, both serial ports have login prompts output:

uart2

uart0

Do I need to mask ttySx that is not used in/etc/securetty?

 

  • 0
    TI__Guru*** 146426 points

    Hi,

    Please provide the patches showing how you changed the console port from uart0 to uart2.

  • 0 in reply to Bin Liu
    Prodigy 40 points

    Hi Bin,

    The patch is as follows:

    uboot

    diff --git a/arch/arm/dts/k3-am62x-r5-sk-common.dtsi b/arch/arm/dts/k3-am62x-r5-sk-common.dtsi
index b4a5e3cfa1..d5976095e9 100644
--- a/arch/arm/dts/k3-am62x-r5-sk-common.dtsi
+++ b/arch/arm/dts/k3-am62x-r5-sk-common.dtsi
@@ -13,7 +13,7 @@
 	};
 
 	chosen {
-		stdout-path = "serial2:115200n8";
+		stdout-path = "serial4:115200n8";
 		tick-timer = &timer1;
 	};
 
diff --git a/arch/arm/dts/k3-am62x-sk-common-u-boot.dtsi b/arch/arm/dts/k3-am62x-sk-common-u-boot.dtsi
index b57d9563d8..acc064337a 100644
--- a/arch/arm/dts/k3-am62x-sk-common-u-boot.dtsi
+++ b/arch/arm/dts/k3-am62x-sk-common-u-boot.dtsi
@@ -6,7 +6,7 @@
 
 / {
 	chosen {
-		stdout-path = "serial2:115200n8";
+		stdout-path = "serial4:115200n8";
 		tick-timer = &timer1;
 	};
 
diff --git a/arch/arm/dts/k3-am62x-sk-common.dtsi b/arch/arm/dts/k3-am62x-sk-common.dtsi
index 72ebb1400f..58a3bc713e 100644
--- a/arch/arm/dts/k3-am62x-sk-common.dtsi
+++ b/arch/arm/dts/k3-am62x-sk-common.dtsi
@@ -14,7 +14,7 @@
 
 / {
 	aliases {
-		serial2 = &main_uart0;
+		serial4 = &main_uart2;
 		mmc0 = &sdhci0;
 		mmc1 = &sdhci1;
 		mmc2 = &sdhci2;
@@ -25,8 +25,8 @@
 	};
 
 	chosen {
-		stdout-path = "serial2:115200n8";
-		bootargs = "console=ttyS2,115200n8 earlycon=ns16550a,mmio32,0x02800000";
+		stdout-path = "serial4:115200n8";
+		bootargs = "console=ttyS4,115200n8 earlycon=ns16550a,mmio32,0x02820000";
 	};
 
 	memory@80000000 {
@@ -154,10 +154,17 @@
 };
 
 &main_pmx0 {
-	main_uart0_pins_default: main-uart0-pins-default {
+	// main_uart0_pins_default: main-uart0-pins-default {
+	// 	pinctrl-single,pins = <
+	// 		AM62X_IOPAD(0x1c8, PIN_INPUT, 0) /* (D14) UART0_RXD */
+	// 		AM62X_IOPAD(0x1cc, PIN_OUTPUT, 0) /* (E14) UART0_TXD */
+	// 	>;
+	// };
+
+		main_uart2_pins_default: main-uart2-pins-default {
 		pinctrl-single,pins = <
-			AM62X_IOPAD(0x1c8, PIN_INPUT, 0) /* (D14) UART0_RXD */
-			AM62X_IOPAD(0x1cc, PIN_OUTPUT, 0) /* (E14) UART0_TXD */
+			AM62X_IOPAD(0x01d0, PIN_INPUT, 3) /* (B14) UART0_CTSn.UART2_RXD */
+			AM62X_IOPAD(0x01d4, PIN_OUTPUT, 3) /* (C13) UART0_RTSn.UART2_TXD */
 		>;
 	};
 
@@ -301,8 +308,7 @@
 };
 
 &main_uart0 {
-	pinctrl-names = "default";
-	pinctrl-0 = <&main_uart0_pins_default>;
+	status = "disabled";
 };
 
 &main_uart1 {
@@ -311,7 +317,9 @@
 };
 
 &main_uart2 {
-	status = "disabled";
+	pinctrl-names = "default";
+	pinctrl-0 = <&main_uart2_pins_default>;
+	status = "okay";
 };
 
 &main_uart3 {

diff --git a/arch/arm/mach-k3/am62x/clk-data.c b/arch/arm/mach-k3/am62x/clk-data.c
index 47ea973197..9f8d7d7e6f 100644
--- a/arch/arm/mach-k3/am62x/clk-data.c
+++ b/arch/arm/mach-k3/am62x/clk-data.c
@@ -115,11 +115,16 @@ static const char * const wkup_clksel_out0_parents[] = {
 	"hsdiv4_16fft_mcu_0_hsdivout0_clk",
 };
 
-static const char * const main_usart0_fclk_sel_out0_parents[] = {
-	"usart_programmable_clock_divider_out0",
+static const char * const main_usart2_fclk_sel_out0_parents[] = {
+	"usart_programmable_clock_divider_out2",
 	"hsdiv4_16fft_main_1_hsdivout1_clk",
 };
 
+// static const char * const main_usart0_fclk_sel_out0_parents[] = {
+// 	"usart_programmable_clock_divider_out0",
+// 	"hsdiv4_16fft_main_1_hsdivout1_clk",
+// };
+
 static const struct clk_data clk_list[] = {
 	CLK_FIXED_RATE("osc_26_mhz", 26000000, 0),
 	CLK_FIXED_RATE("osc_25_mhz", 25000000, 0),
@@ -199,10 +204,12 @@ static const struct clk_data clk_list[] = {
 	CLK_MUX("main_gpmc_fclk_sel_out0", main_gpmc_fclk_sel_out0_parents, 2, 0x108180, 0, 1, 0),
 	CLK_MUX("main_gtcclk_sel_out0", main_gtcclk_sel_out0_parents, 8, 0x43008030, 0, 3, 0),
 	CLK_MUX("main_ospi_ref_clk_sel_out0", main_ospi_ref_clk_sel_out0_parents, 2, 0x108500, 0, 1, 0),
-	CLK_DIV_DEFFREQ("usart_programmable_clock_divider_out0", "hsdiv4_16fft_main_1_hsdivout0_clk", 0x108240, 0, 2, 0, 0, 48000000),
+	CLK_DIV_DEFFREQ("usart_programmable_clock_divider_out2", "hsdiv4_16fft_main_1_hsdivout0_clk", 0x108248, 0, 2, 0, 0, 48000000),
+	//CLK_DIV_DEFFREQ("usart_programmable_clock_divider_out0", "hsdiv4_16fft_main_1_hsdivout0_clk", 0x108240, 0, 2, 0, 0, 48000000),
 	CLK_MUX("wkup_clkout_sel_out0", wkup_clkout_sel_out0_parents, 8, 0x43008020, 0, 3, 0),
 	CLK_MUX("wkup_clksel_out0", wkup_clksel_out0_parents, 2, 0x43008010, 0, 1, 0),
-	CLK_MUX("main_usart0_fclk_sel_out0", main_usart0_fclk_sel_out0_parents, 2, 0x108280, 0, 1, 0),
+	CLK_MUX("main_usart2_fclk_sel_out0", main_usart2_fclk_sel_out0_parents, 2, 0x108288, 0, 1, 0), 
+	//CLK_MUX("main_usart0_fclk_sel_out0", main_usart0_fclk_sel_out0_parents, 2, 0x108280, 0, 1, 0), 
 	CLK_DIV("hsdiv4_16fft_mcu_0_hsdivout1_clk", "pllfracf2_ssmod_16fft_mcu_0_foutvcop_clk", 0x4040084, 0, 7, 0, 0),
 	CLK_FIXED_RATE("mshsi2c_wkup_0_porscl", 0, 0),
 	CLK_DIV("sam62_pll_ctrl_wrap_main_0_chip_div24_clk_clk", "sam62_pll_ctrl_wrap_main_0_sysclkout_clk", 0x41011c, 0, 5, 0, 0),
@@ -297,10 +304,14 @@ static const struct dev_clk soc_dev_clk_data[] = {
 	DEV_CLK(136, 0, "hsdiv0_16fft_main_8_hsdivout0_clk"),
 	DEV_CLK(140, 0, "sam62_pll_ctrl_wrap_mcu_0_chip_div1_clk_clk"),
 	DEV_CLK(140, 1, "sam62_pll_ctrl_wrap_mcu_0_chip_div1_clk_clk"),
-	DEV_CLK(146, 0, "main_usart0_fclk_sel_out0"),
-	DEV_CLK(146, 1, "usart_programmable_clock_divider_out0"),
-	DEV_CLK(146, 2, "hsdiv4_16fft_main_1_hsdivout1_clk"),
-	DEV_CLK(146, 5, "sam62_pll_ctrl_wrap_main_0_chip_div1_clk_clk"),
+	// DEV_CLK(146, 0, "main_usart0_fclk_sel_out0"),
+	// DEV_CLK(146, 1, "usart_programmable_clock_divider_out0"),
+	// DEV_CLK(146, 2, "hsdiv4_16fft_main_1_hsdivout1_clk"),
+	// DEV_CLK(146, 5, "sam62_pll_ctrl_wrap_main_0_chip_div1_clk_clk"),
+	DEV_CLK(153, 0, "main_usart2_fclk_sel_out0"),
+	DEV_CLK(153, 1, "usart_programmable_clock_divider_out2"),
+	DEV_CLK(153, 2, "hsdiv4_16fft_main_1_hsdivout1_clk"),
+	DEV_CLK(153, 5, "sam62_pll_ctrl_wrap_main_0_chip_div1_clk_clk"),
 	DEV_CLK(157, 20, "clkout0_ctrl_out0"),
 	DEV_CLK(157, 21, "hsdiv4_16fft_main_2_hsdivout1_clk"),
 	DEV_CLK(157, 22, "hsdiv4_16fft_main_2_hsdivout1_clk"),
diff --git a/arch/arm/mach-k3/am62x/dev-data.c b/arch/arm/mach-k3/am62x/dev-data.c
index f413313533..a1954d5ca2 100644
--- a/arch/arm/mach-k3/am62x/dev-data.c
+++ b/arch/arm/mach-k3/am62x/dev-data.c
@@ -62,7 +62,8 @@ static struct ti_dev soc_dev_list[] = {
 	PSC_DEV(162, &soc_lpsc_list[10]),
 	PSC_DEV(75, &soc_lpsc_list[11]),
 	PSC_DEV(102, &soc_lpsc_list[12]),
-	PSC_DEV(146, &soc_lpsc_list[12]),
+	PSC_DEV(153, &soc_lpsc_list[12]),
+	// PSC_DEV(146, &soc_lpsc_list[12]),
 	PSC_DEV(13, &soc_lpsc_list[13]),
 	PSC_DEV(166, &soc_lpsc_list[14]),
 	PSC_DEV(135, &soc_lpsc_list[15]),

diff --git a/include/environment/ti/boot.h b/include/environment/ti/boot.h
index a598607ead..4f4c8bba1d 100644
--- a/include/environment/ti/boot.h
+++ b/include/environment/ti/boot.h
@@ -12,7 +12,8 @@
 #include <linux/stringify.h>
 
 #ifndef CONSOLEDEV
-#define CONSOLEDEV "ttyS2"
+// #define CONSOLEDEV "ttyS2"
+#define CONSOLEDEV "ttyS4"
 #endif
 
 #ifndef PARTS_DEFAULT

diff --git a/include/configs/am62x_evm.h b/include/configs/am62x_evm.h
index 97bd7c1fd7..70004fbb79 100644
--- a/include/configs/am62x_evm.h
+++ b/include/configs/am62x_evm.h
@@ -129,9 +129,9 @@
                        "setenv name_fdt k3-am62x-lp-sk.dtb; fi;"       \
                "setenv fdtfile ${name_fdt}\0"                          \
        "name_kern=Image\0"                                             \
-       "console=ttyS2,115200n8\0"                                      \
+       "console=ttyS4,115200n8\0"                                      \
        "args_all=setenv optargs ${optargs} "                           \
-               "earlycon=ns16550a,mmio32,0x02800000 ${mtdparts}\0"     \
+               "earlycon=ns16550a,mmio32,0x02820000 ${mtdparts}\0"     \
        "run_kern=booti ${loadaddr} ${rd_spec} ${fdtaddr}\0"
 
 /* U-Boot MMC-specific configuration */

    kernel

    diff --git a/arch/arm64/boot/dts/ti/k3-am62x-sk-common.dtsi b/arch/arm64/boot/dts/ti/k3-am62x-sk-common.dtsi
index 3e7204440f..59ff3377ad 100644
--- a/arch/arm64/boot/dts/ti/k3-am62x-sk-common.dtsi
+++ b/arch/arm64/boot/dts/ti/k3-am62x-sk-common.dtsi
@@ -8,25 +8,32 @@
 / {
 	aliases {
 		serial2 = &main_uart0;
+		serial3 = &main_uart1;
+		serial4 = &main_uart2;
 		mmc0 = &sdhci0;
-		mmc1 = &sdhci1;
-		mmc2 = &sdhci2;
-		spi0 = &ospi0;
-		usb0 = &usb0;
-		usb1 = &usb1;
+		// mmc1 = &sdhci1;
+		// mmc2 = &sdhci2;
+		//usb0 = &usb0;
+		// usb1 = &usb1;
 		ethernet0 = &cpsw_port1;
 		ethernet1 = &cpsw_port2;
 	};
 
 	chosen {
-		stdout-path = "serial2:115200n8";
-		bootargs = "console=ttyS2,115200n8 earlycon=ns16550a,mmio32,0x02800000";
+		stdout-path = "serial4:115200n8";
+		bootargs = "console=ttyS4,115200n8 earlycon=ns16550a,mmio32,0x02820000";
 	};
 
 &main_pmx0 {
@@ -235,6 +241,20 @@ AM62X_IOPAD(0x1cc, PIN_OUTPUT, 0) /* (E14) UART0_TXD */
 		>;
 	};
 
+	main_uart1_pins_default: main-uart1-pins-default {
+		pinctrl-single,pins = <
+			AM62X_IOPAD(0x01ac, PIN_INPUT, 2) /* (D15) MCASP0_AFSR.UART1_RXD */
+			AM62X_IOPAD(0x01b0, PIN_OUTPUT, 2) /* (D16) MCASP0_ACLKR.UART1_TXD */
+		>;
+	};
+
+	main_uart2_pins_default: main-uart2-pins-default {
+		pinctrl-single,pins = <
+			AM62X_IOPAD(0x01d0, PIN_INPUT, 3) /* (B14) UART0_CTSn.UART2_RXD */
+			AM62X_IOPAD(0x01d4, PIN_OUTPUT, 3) /* (C13) UART0_RTSn.UART2_TXD */
+		>;
+	};
+
 	main_i2c0_pins_default: main-i2c0-pins-default {
 		pinctrl-single,pins = <
 			AM62X_IOPAD(0x1e0, PIN_INPUT_PULLUP, 0) /* (B16) I2C0_SCL */
@@ -301,9 +321,10 @@ AM62X_IOPAD(0x128, PIN_INPUT, 7) /* (B23) MMC2_SDWP.GPIO0_72 */
 		>;
 	};
 
 
@@ -314,115 +335,91 @@ AM62X_IOPAD(0x15c, PIN_INPUT, 0) /* (AB22) MDIO0_MDIO */
 		>;
 	};
 };
 
 &wkup_uart0 {
@@ -437,15 +434,20 @@ &mcu_uart0 {
 &main_uart0 {
 	pinctrl-names = "default";
 	pinctrl-0 = <&main_uart0_pins_default>;
+	//status = "reserved";
 };
 
 &main_uart1 {
 	/* Main UART1 is used by TIFS firmware */
-	status = "reserved";
+	pinctrl-names = "default";
+	pinctrl-0 = <&main_uart1_pins_default>;
+	//status = "reserved";
 };
 
 &main_uart2 {
-	status = "disabled";
+	pinctrl-names = "default";
+	pinctrl-0 = <&main_uart2_pins_default>;
+	//status = "disabled";
 };
 
 &main_uart3 {
 };

  • 0 in reply to z js
    TI__Guru*** 146426 points

    Hi,

    Please run the following commands on UART2 console, then reboot your board to see if the login prompt still show in on UART0.

    # systemctl stop serial-getty@ttyS2.service
# systemctl disable serial-getty@ttyS2.service

  • 0 in reply to Bin Liu
    Prodigy 40 points

    Hi,

    After executing the above two instructions and restarting, there was no startup log displayed in UART0.

  • 0 in reply to z js
    TI__Guru*** 146426 points

    Hi,

    I am glad the issue is resolved. Thanks for the update.