AM62A7: About the MCU_MCAN node DTS issue

daohong qin

Part Number: AM62A7

Hi TI Team,

The link at https://software-dl.ti.com/processor-sdk-linux/esd/AM62AX/09_00_01/exports/docs/linux/How_to_Guides/Target/How_to_test_MCAN_on_AM62x.html#enable-mcu-mcans-on-am62ax provides instructions on enabling MCU MCANs on AM62ax. However, there seems to be some bugs in the guide, which causes a conflict when using mcu_mcan1 as there is already mcu_mcan0 and mcu_mcan1 defined in SDK9.0 (version: 09_00_01_03) in the k3-am62a-mcu.dtsi source code, and the guide adds mcu_mcan1 and mcu_mcan2.

//source code .dtsi

//TI DOC

If I delete the source code's mcu_mcan0 and mcu_mcan1 and replace them with the guide's mcu_mcan1 and mcu_mcan2, when running the board, it will report errors.

If I keep mcu_mcan0 and mcu_mcan1 in the source code unchanged and modify the guide's mcu_mcan1 and mcu_mcan2 to mcu_mcan2 and mcu_mcan3, respectively, and add them to the source code k3-am62a-mcu.dtsi, there will be a failure in CAN node registration.

Is it possible for TI to fix this bug and make an update in the future?

Best Regards,

Daohong

over 2 years ago

0 Schuyler Patton over 2 years ago

TI__Mastermind 40980 points

Hi,

I see your point about a possible bug. I will ask the developer to review this page.

It looks like you are getting errors due to a bad overlay application.

I would recommend basing your overlay on this file. While this file is for the AM62x this overlay definition I recommend could be used as a starting point for the AM62a. There will be some modifications required to use it for the AM62a.

There are three possible MCAN interfaces. The first is defined in what is the main domain and is called main_mcan0 (defined in this file k3-am62a-main.dtsi). The other 2 interfaces are in what is called mcu domain and are called mcu_mcan0 and mcu_mcan1 ( defined in k3-am62a-mcu.dtsi. There is not a mcu_mcan0-2.

Best Regards,

Schuyler

+1 Schuyler Patton over 2 years ago in reply to Schuyler Patton

TI__Mastermind 40980 points

Hi,

I need to add some additional information after talking with the developer. The current 9.0 SDK for the AM62a does not have initial support for the mcu mcan nodes. The link you are referencing is showing how to add that support to the mcu dtsi file. After adding that support the example I mentioned in the earlier post should work.

The upcoming 9.1 SDK will not require this step.

Best Regards,

Schuyler

0 daohong qin over 2 years ago in reply to Schuyler Patton

Expert 1120 points

Hi Schuyler

Ok, thank you for your reply.

Best Regards,

Daohong

0 Schuyler Patton over 2 years ago in reply to daohong qin

TI__Mastermind 40980 points

Hi Daohong,

I am closing this thread. Looks like you have another thread that is active. We can continue in that one.

Best Regards,

Schuyler

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AM62A7: About the MCU_MCAN node DTS issue