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AM62P: Can I use main_uart1 as the debug console on AM62P?

YuYuan Wang
Prodigy 170 points
Part Number: AM62P

Tool/software:

Hi TI experts,

I know the TI EVM is using main_uart0 as debug console. But we plan use main_uart1 (B24 / C24) as the debug console

So I would like to ask the following questions:

1. Is it possible to switch the debug console to main_uart1?

2. If so, what are the required changes in the device tree and bootloader configuration?

3. Is there any dependency or limitation with using main_uart1 for this purpose?

  • 0
    TI__Guru**** 167581 points

    Hi YuYuan,

    The following U-Boot patch changes the U-Boot console from UART0 to UART1. I tested it with SDK10.0 on AM62x. Please do the similar change for AM62P U-Boot.

    diff --git a/arch/arm/dts/k3-am62x-sk-common.dtsi b/arch/arm/dts/k3-am62x-sk-common.dtsi
index 59ee49616505..5e8276ced9ca 100644
--- a/arch/arm/dts/k3-am62x-sk-common.dtsi
+++ b/arch/arm/dts/k3-am62x-sk-common.dtsi
@@ -12,7 +12,7 @@
 
 / {
        aliases {
-               serial2 = &main_uart0;
+               serial2 = &main_uart1;
                mmc0 = &sdhci0;
                mmc1 = &sdhci1;
                mmc2 = &sdhci2;
@@ -355,9 +355,10 @@
 &main_uart1 {
        /* Main UART1 is used by TIFS firmware */
        bootph-pre-ram;
-       status = "reserved";
+       status = "okay";
        pinctrl-names = "default";
        pinctrl-0 = <&main_uart1_pins_default>;
+       clock-frequency = <48000000>;
 };
 
 &main_i2c0 {
diff --git a/arch/arm/mach-k3/r5/am62x/dev-data.c b/arch/arm/mach-k3/r5/am62x/dev-data.c
index 59c95df2a887..808a07eb5533 100644
--- a/arch/arm/mach-k3/r5/am62x/dev-data.c
+++ b/arch/arm/mach-k3/r5/am62x/dev-data.c
@@ -60,7 +60,7 @@ static struct ti_dev soc_dev_list[] = {
        PSC_DEV(75, &soc_lpsc_list[10]),
        PSC_DEV(36, &soc_lpsc_list[11]),
        PSC_DEV(102, &soc_lpsc_list[11]),
-       PSC_DEV(146, &soc_lpsc_list[11]),
+       PSC_DEV(152, &soc_lpsc_list[11]),
        PSC_DEV(13, &soc_lpsc_list[12]),
        PSC_DEV(166, &soc_lpsc_list[13]),
        PSC_DEV(135, &soc_lpsc_list[14]),

  • 0 in reply to Bin Liu
    Prodigy 170 points

    Hi Bin,

    Thanks for your reply. But my defconfig is "CONFIG_SOC_K3_AM62P5=y".
    My project should be using the dev-data.c under arch/arm/mach-k3/r5/am62px/ not am62x.

  • 0 in reply to YuYuan Wang
    TI__Guru**** 167581 points

    The patch is for your reference. You would need to adjust it accordingly for AM62Px devices.

  • 0 in reply to Bin Liu
    Prodigy 170 points

    Hi Bin,

    I'm not quite sure what the number after PSCDEV represents. What should I refer to?

    Or should I simply change 146 to 152?

    diff --git a/arch/arm/mach-k3/r5/am62px/dev-data.c b/arch/arm/mach-k3/r5/am62px/dev-data.c
index dc7d092fdb0..c4fa7712e5a 100644
--- a/arch/arm/mach-k3/r5/am62px/dev-data.c
+++ b/arch/arm/mach-k3/r5/am62px/dev-data.c
@@ -52,7 +52,7 @@ static struct ti_dev soc_dev_list[] = {
        PSC_DEV(75, &soc_lpsc_list[7]),
        PSC_DEV(36, &soc_lpsc_list[8]),
        PSC_DEV(102, &soc_lpsc_list[8]),
-       PSC_DEV(146, &soc_lpsc_list[8]),
+       PSC_DEV(152, &soc_lpsc_list[8]),
        PSC_DEV(13, &soc_lpsc_list[9]),
        PSC_DEV(166, &soc_lpsc_list[10]),
        PSC_DEV(135, &soc_lpsc_list[11]),

  • +1 in reply to YuYuan Wang
    TI__Guru**** 167581 points

    Hi Yuyuan,

    Please use the following patch for AM62Px:

    diff --git a/arch/arm/mach-k3/r5/am62px/dev-data.c b/arch/arm/mach-k3/r5/am62px/dev-data.c
index dc7d092fdb0e..c4fa7712e5aa 100644
--- a/arch/arm/mach-k3/r5/am62px/dev-data.c
+++ b/arch/arm/mach-k3/r5/am62px/dev-data.c
@@ -52,7 +52,7 @@ static struct ti_dev soc_dev_list[] = {
        PSC_DEV(75, &soc_lpsc_list[7]),
        PSC_DEV(36, &soc_lpsc_list[8]),
        PSC_DEV(102, &soc_lpsc_list[8]),
-       PSC_DEV(146, &soc_lpsc_list[8]),
+       PSC_DEV(152, &soc_lpsc_list[8]),
        PSC_DEV(13, &soc_lpsc_list[9]),
        PSC_DEV(166, &soc_lpsc_list[10]),
        PSC_DEV(135, &soc_lpsc_list[11]),

    The number is the device ID documented in the link below. 146 is uart0, and 152 is uart1.

    https://software-dl.ti.com/tisci/esd/latest/5_soc_doc/am62px/devices.html