AM5728: AM5728

Hello ?,

What SDK version are you utilizing?

-Josue

ti-processor-sdk-linux-rt-am57xx-evm-04.03.00.05

?,

This is a very old SDK and our support for these is very limited. Have you seen this behavior on a newer SDK?

I will need some more time to see how this can be set up via the DT, but this support will only be for the later SDKs.

-Josue

I have one questons: What's DT?

Although my Tronlong AM5728 boards are not official development boards and they use old SDK for their productios, if you can give me supports base on later SDKs maybe also helpful for change W5500 from eth0 to eth4 on Tronlong boards. Why not have a try?

?
DT is short for Device Tree or Device Tree Source (.dts). 

Josue Zamitiz-Ayala said:

I will need some more time to see how this can be set up via the DT, but this support will only be for the later SDKs.

That was the purpose of this comment. I was also making sure the expectations for support for such an old SDK were delineated from the start.

I am currently interfacing internally and will get back to you by next week.

A follow up question, is this a custom board or a TI board, I am assuming you are utilizing the PRU ports? I'm curious why you would need another ethernet port.

-Josue

?,

Here are a couple of ways that you can do this:

DTS:

Using an alias in DTS to set an ethernet interface to an specific MAC port, see the following:

• https://www.linkedin.com/pulse/device-trees-embedded-linux-keroles-khalil/
• https://developer.toradex.com/software/linux-resources/device-tree/device-tree-overview/#aliases-node

Or you could use the ifrename tool as well. you would have to add this to your Linux distro. Se:

• https://www.redhat.com/sysadmin/network-interfaces-linux

Best,

Josue

Tronlong is a company which produce development boards with TI SoCs(https://www.tronlong.com/). I have asked them  how to deal with this problem, they didn`t give me useful answers.

We are using TL5728-IDK boards(Tronlong development board with AM5728) to develop our network switch boards. Because there are only four net ports which TL5728-IDK boards provide, we use w5500 as an additional network port to send log messages as the fifth net port.

I know Device Tree.

I have tried to bind W5500 as eth4 with a fixed MAC address, however the TL5728-IDK board (Tronlong development board with AM5728) will have boot errors in this way. Because the W5500 has two driver source files, w5500.c and w5500-spi.c, the W5500 will be probed as the SPI devices which is earlier than other network ports. If the SPI devices can be probed and startup later than other net devices, the W5500 can be eth4. But I don't know how to change SPI and net devices boot sequence.

Chengao,

So you are using the PRU ports?
I believe this device is capable of using 4 PRU eth ports and 2 regular ethernet ports. I am assuming this board is based on the TI IDK:

Technically there are 6 available ethernet ports are there not?

Otherwise, have you tried assigning all ports as aliases?

Ultimately you could use the ifrename tool after all interfaces are up.

-Josue

We use core boards of TL5728-IDK and design custom base boards with only PRU2-MII0/PRU2-MII1(DP83640)  and RGMII0/RGMII1(KSZ9031RNXIA). Our hardware engineers say AM5728 only support 4 mac, which is also a reason why we use W5500.  

Because the space of metro cabs is limited, we design our custom base boards as 3U card (100mm × 160mm), we only reserved the connection of PRU2 and RGMII between base board and core board, which is different from Tronlong TL5728-IDK original base board. We use W5500 as additional network port rather than PRU1.

I want a prescription which can delay W5500 (SPI) startup sequence during Linux kernel startup and RGMII PRU can startup earlier than W5500. We want all device drivers compiled in zImage.

Chenghao,

Our standard support model does not support any external ethernet ports. Please reach out to the w5500 manufacturers, Trolong or the open source community to find a solution to your issue.

This is an application specific task that falls on the costumer responsibility to implement.

If I were dong this exercise, I would start with changing the way the kernel modules are loaded.

Here are a few links to get you started:

• https://docs.oracle.com/en/operating-systems/oracle-linux/6/admin/ol_bootmodules.html
• https://groups.google.com/g/linux.debian.devel/c/c6S7wXQJcgY/m/bMsfTEggaP8J
• https://unix.stackexchange.com/questions/680689/load-kernel-module-at-boot-time-with-options

Best,

Josue

I have tried to edit custom .config file named w5500.config in  /etc/modprobe.d  with "install w5100-spi /sbin/modprobe ti_prueth; /sbin/modprobe --ignore-install w5100-spi" and w5500.conf in /etc/modules-load.d with "w5100-spi", but the w5500 is still eth0.

What's really frustrating is that when I edited these two .config files the startup order of ti_prueth.ko was also advanced. Before I edited both .config, ti_prueth.ko was the penultimate startup .ko module.

Chenghao,

Have you looked into using the following tool?

Josue Zamitiz-Ayala said:

ifrename

Again, Please seek further assistance with the open source community. Our support will very scarce moving forward.

Best,

Josue

The command "ifrename" is not  found on TL5728-IDK.

The tool has to be cross compiled and installed.