Allocate peripherals

Ensure that the remote core and Linux request different peripherals.

For more information about how to allocate peripherals in a multicore processor, refer to section How to allocate peripherals.

If we open the SysConfig settings for the project as discussed at How to open a project’s SysConfig settings, We can see that the debug console is requesting the UART0 instance:

However, when we check the Linux devicetree file, we can see that Linux is also requesting main_uart0!

ti-linux-kernel/arch/arm64/boot/dts/ti$ grep -r --include=k3-am64* main_uart0
k3-am64-main.dtsi:      main_uart0: serial@2800000 {
k3-am642-evm.dts:       main_uart0_pins_default: main-uart0-pins-default {
k3-am642-evm.dts:&main_uart0 {
k3-am642-evm.dts:       pinctrl-0 = <&main_uart0_pins_default>;
k3-am64.dtsi:           serial2 = &main_uart0;
k3-am642-sk.dts:        main_uart0_pins_default: main-uart0-pins-default {
k3-am642-sk.dts:&main_uart0 {
k3-am642-sk.dts:        pinctrl-0 = <&main_uart0_pins_default>;


&main_uart0 {
    status = "okay";
    pinctrl-names = "default";
    pinctrl-0 = <&main_uart0_pins_default>;
};

This peripheral conflict will cause issues if it is not addressed.

Option 1: Leave the peripheral conflict. We will fix it in the debug section

If you want some practice debugging errors, do NOT change anything. You will learn how to debug the errors that are generated in section Debug the remote core alongside Linux.

Option 2: Fix the peripheral conflict

If you were not following a training page, you would want to fix a resource conflict as soon as you found it. You would need to disable the peripheral allocation in either the Linux devicetree file, or the MCU+ project’s SysConfig settings.

Here is one potential way to resolve the UART conflict:

Let’s disable the UART in the hello_world project, since we will be using the Linux trace log to see the hello_world output.

Open SysConfig for the project. We can see that there is in fact a UART0 instance that was created for the debug console:

Go to the TI DRIVER PORTING LAYER > Debug Log section. Uncheck the “Enable UART Log” box. You will see the UART instance disappear from the TI DRIVERS > UART section.

Save the SysConfig changes. One final time, rebuild the MCU+ project, put the new project .out file into the Linux filesystem, and reload the project.