TMDS64GPEVM: Device tree modification for ethernet ports

Hello Ben,

Please start by reviewing the information in the other thread you've commented on:
https://e2e.ti.com/support/processors-group/processors/f/processors-forum/1131974/processor-sdk-am64x-loading-r5-fw-by-linux---soc-clock-issue

Linux settings

The SysConfig tool can be used to generate pinmux settings, but it will not generate the Linux devicetree file for you. You need to make the changes yourself and disable any peripherals you do NOT want Linux to control (e.g., the PRU_ICSSG instances that you want R5 to control).

MCU+ Settings 

Enable the PRU Ethernet in SysConfig. Potentially interesting documentation pages are
https://software-dl.ti.com/mcu-plus-sdk/esd/AM64X/08_04_00_17/exports/docs/api_guide_am64x/NETWORKING.html
https://software-dl.ti.com/mcu-plus-sdk/esd/AM64X/08_04_00_17/exports/docs/api_guide_am64x/INDUSTRIAL_COMMS.html

Regards,

Nick

Hi Nick,

I have reviewed the thread again and did not find any information on make the relevant changes to the ethernet device.
In your latest reply in that thread you mentioned:

Each peripheral can only be controlled by one core. So either Linux or R5 could control the CPSW, or PRU_ICSSG0, or PRU_ICSSG1. So first you need to decide which core is going to control which peripheral.

The AM64x GP-EVM actually allows you to switch which whether Linux is using 1 CPSW port and 2 PRU Ethernet ports, or 2 CPSW ports and 1 PRU Ethernet port. See this post for more information on how to switch between the two settings for Linux: https://e2e.ti.com/support/processors-group/processors/f/processors-forum/1137215/tmds64gpevm-eth1-port-is-cpsw-instead-of-prueth

In regards to this comment, we would need Linux (A53 core) to control 2 CPSW ports, and RTOS Firmware (R5 core) to control the PRU ethernet port.
You also mentioned in that thread:

If we look in the board devicetree file k3-am642-evm.dts, we actually see that PRU Ethernet is using whatever parts of SRAM have not been reserved for other usecases:

	icssg1_eth: icssg1-eth {
		...
		sram = <&oc_sram>;
		...
	};

Does this mean I need to delete the entire icssg1_eth structure from the device tree?
I remember trying that in my last attempt, and booted Linux and did not have any network interface / IP.

My goal is to have an network access from both A53 and R5 cores.