AM6442: Change boot console to main_uart5 from main_uart0

Shigemi Mikayama

Part Number: AM6442
Other Parts Discussed in Thread: TMDS64EVM

Tool/software:

Hi,

I am trying to change the u-boot console from main-uart0 to main-uart3 with TMDS64EVM, but fails so far.

I've read this topic, https://e2e.ti.com/support/processors-group/processors/f/processors-forum/1240439/am625-changing-u-boot-console-from-uart0-to-uart4/4714870#4714870, and the situation, no clock definition for main_uart3, seams to be same.

Our custom board's boot console is to be main_uart5 or main_uart6, but, currently I am developing u-boot for our board with TMDS64EVM and SDK10.00.

Could you please advise how to fix this problem?

9 months ago

0 Bin Liu 9 months ago

TI__Guru**** 168311 points

Hi,

I am working with our sw dev team to get the config data and will update here once I have it.

0 Bin Liu 9 months ago

TI__Guru**** 168311 points

Hi,

The AM64x has different software architecture than that on AM62x, so those clock definition mentioned in the referred e2e thread is not required for AM64x to enable different UART in U-Boot.

The following U-Boot patch is an example on SDK10.0 for switching U-Boot console from main_uart0 to main_uart3. Please use it as an reference for changing U-Boot console to main_uart5 or main_uart6.

diff --git a/arch/arm/dts/k3-am642-evm.dts b/arch/arm/dts/k3-am642-evm.dts
index 50e80436b068..4942244055ef 100644
--- a/arch/arm/dts/k3-am642-evm.dts
+++ b/arch/arm/dts/k3-am642-evm.dts
@@ -18,7 +18,7 @@
        model = "Texas Instruments AM642 EVM";
 
        chosen {
-               stdout-path = &main_uart0;
+               stdout-path = &main_uart3;
        };
 
        aliases {
@@ -318,10 +318,16 @@
                >;
        };
 
+       main_uart3_pins_default: main_uart3-default-pins {
+               bootph-all;
+               pinctrl-single,pins = <
+                       AM64X_IOPAD(0x0248, PIN_INPUT, 4) /* (D16) UART1_CTSn.UART3_RXD */
+                       AM64X_IOPAD(0x024c, PIN_OUTPUT, 4) /* (E16) UART1_RTSn.UART3_TXD */
+               >;
+       };
+
        main_uart1_pins_default: main-uart1-default-pins {
                pinctrl-single,pins = <
-                       AM64X_IOPAD(0x0248, PIN_INPUT, 0)               /* (D16) UART1_CTSn */
-                       AM64X_IOPAD(0x024c, PIN_OUTPUT, 0)              /* (E16) UART1_RTSn */
                        AM64X_IOPAD(0x0240, PIN_INPUT, 0)               /* (E15) UART1_RXD */
                        AM64X_IOPAD(0x0244, PIN_OUTPUT, 0)              /* (E14) UART1_TXD */
                >;
@@ -503,6 +509,13 @@
        pinctrl-0 = <&main_uart1_pins_default>;
 };
 
+&main_uart3 {
+       bootph-all;
+       status = "okay";
+       pinctrl-names = "default";
+       pinctrl-0 = <&main_uart3_pins_default>;
+};
+
 &main_i2c0 {
        bootph-all;
        status = "okay";
diff --git a/arch/arm/dts/k3-am642-r5-evm.dts b/arch/arm/dts/k3-am642-r5-evm.dts
index 548cfce8f991..507696c841b1 100644
--- a/arch/arm/dts/k3-am642-r5-evm.dts
+++ b/arch/arm/dts/k3-am642-r5-evm.dts
@@ -143,7 +143,7 @@
  * Delete clock/power-domain properties to avoid
  * UART init failure
  */
-&main_uart0 {
+&main_uart3 {
        /delete-property/ power-domains;
        /delete-property/ clocks;
        /delete-property/ clock-names;

0 Shigemi Mikayama 9 months ago in reply to Bin Liu

Prodigy 60 points

Hi Bin,

Thank you for your response.

I have already editted k3-am642-evm.dts file as your patch, but I did'nt modify k3-am642-r5-evm.dts.

Boot console moved to main-uart3 successfully on TMDS64EVM with your patch.

Thank you.

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AM6442: Change boot console to main_uart5 from main_uart0