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DRA821U: Queries about CAN-FD and Ethernet Switch

Jack
Guru 10136 points

Part Number: DRA821U
Other Parts Discussed in Thread: DRA829, DRA821

Hi TI

There're questions about CAN-FD and Ethernet that Customer wants to clarify below.

This is necessary for the report to customer's clients, so please explain it in as much detail as possible.

1. I found DRA821U supports 20 ports of CAN-FD according to datasheet. Can you please clarify how many ports are able to be connected to MCU side?

2. Is it possible for CAN ports connected to MCU side to be seen as socket form after completion of AP Linux Boot ?

3. Is development support possible when implementing gateway functionality between CANs, and between CAN and Ethernet  in AP side ?

4. Is it possible to provide Customer with CAN-FD/HS driver for Linux ?

5. What's Estimated speed of communication between MCU's RMII and AP Switch Port (SGMII)?

Please don't care below sentences since it's captured from original thread for my understanding during writing. 

  1. MCU 에 연결될 수 있는 CAN-FD 최대 개수
  2. AP 의 리눅스 부팅완료 후 MCU 에 연결된 CAN 들이 소켓형태로 보여질수 있는지 여부
  3. AP 에서 게이트웨이 (CAN간, CAN/ETH간) 기능 구현시, 개발지원여부
  4. 리눅스에서 CAN FD/HS 드라이버 제공가능여부
  5. MCU (RMII) 와 AP 스위치 포트 (SGMII) 간 통신시 예상속도

Regards, 

Jack

  • 0
    Guru 10136 points

    Hi TI

    Could you please update us at least partially if available ?

    Regards, 
    Jack

  • 0
    TI__Mastermind 37435 points

    Hi Jack,

    Jack said:
    1. I found DRA821U supports 20 ports of CAN-FD according to datasheet. Can you please clarify how many ports are able to be connected to MCU side?

    There are two in MCU domain and rest in Main Domain as can be seen from TRM

    Jack said:
    2. Is it possible for CAN ports connected to MCU side to be seen as socket form after completion of AP Linux Boot ?

    It's possible but it's not supported right now. We are evaluating this feature request.

    Jack said:
    3. Is development support possible when implementing gateway functionality between CANs, and between CAN and Ethernet  in AP side ?

    Do you mean Gateway running on AP or Gateway booted by AP ? Current gateway application is running on Main R5F and it is going to stay that way but we do have a pending requirement to boot it from A72, there is no plan for it yet.

    Jack said:
    4. Is it possible to provide Customer with CAN-FD/HS driver for Linux ?

    As I said above, Linux driver for CAN-FD is possible but we need to evaluate it. Can you tell me what is the urgency of this requirement ? If it's confidential then reach out to me over email.

    Jack said:
    5. What's Estimated speed of communication between MCU's RMII and AP Switch Port (SGMII)?

    speed will be 100Mbps (or max throughput of MCU RMII)

    Regards

    Vineet

  • 0 in reply to Vineet Roy
    Guru 10136 points

    Hi Vineet

    Thanks for your quick reply.

    I have further questions or reply below.

    Jack Cha said:

    1. Is it possible for CAN ports connected to MCU side to be seen as socket form after completion of AP Linux Boot ?

    It's possible but it's not supported right now. We are evaluating this feature request.

    [Jack] If the evaluation would be done, Will you provide HotFix patch even before next release ?

     

    Jack Cha said:

    1. Is development support possible when implementing gateway functionality between CANs, and between CAN and Ethernet  in AP side ?

    Do you mean Gateway running on AP or Gateway booted by AP ? Current gateway application is running on Main R5F and it is going to stay that way but we do have a pending requirement to boot it from A72, there is no plan for it yet.

    [JACK] It means Gateway running on A72 of Main domain. They asked whether TI to provide customer with technical support when they develop the functionality in AP side.

     

    Jack Cha said:

    1. Is it possible to provide Customer with CAN-FD/HS driver for Linux ?

    As I said above, Linux driver for CAN-FD is possible but we need to evaluate it. Can you tell me what is the urgency of this requirement ? If it's confidential then reach out to me over email.

    [JACK] The basic functionality needs to be implemented by 4Q-2021. Let me check their desired target Date even though they may want ASAP. What's your email address? 

    Regards, 

    Jack

  • 0 in reply to Jack
    TI__Mastermind 37435 points

    Hi Jack,

    Jack said:
    [Jack] If the evaluation would be done, Will you provide HotFix patch even before next release ?

    No, it will not be possible to provide hotfix patch. We are not even committing this for next release, as I mentioned previously the proposal is still under evaluation.

    Jack said:
    [JACK] It means Gateway running on A72 of Main domain. They asked whether TI to provide customer with technical support when they develop the functionality in AP side.

    Gateway is implemented on R5F, not on A72. We currently have no plans for this

    Jack said:
    [JACK] The basic functionality needs to be implemented by 4Q-2021. Let me check their desired target Date even though they may want ASAP. What's your email address? 

    Please send me a friend request on E2E

    Regards

    Vineet

  • 0 in reply to Vineet Roy
    Guru 10136 points

    Hi Vineet

    Thanks for your very quick reply.

    I have one more question about CAN-FD Ports number to be connected to R5F MCU of Main domain.

    Jack Cha said:

    1. I found DRA821U supports 20 ports of CAN-FD according to datasheet. Can you please clarify how many ports are able to be connected to MCU side?

    There are two in MCU domain and rest in Main Domain as can be seen from TRM

    [JACK] Main domain also has R5F MCU, can it be connected to R5F out of 18 CAN-FD ports?

  • 0 in reply to Jack
    Guru 10136 points

    Hi Vineet.

    Thanks for kind conversation.

    I sent you a message regarding further questions. Please asnwer to the question. 

    Thanks.

    Regards, 

    Jack

  • 0 in reply to Jack
    Guru 10136 points

    Hi Vineet

    Could you please answer the questions below?

    • If MCAN is connected to R5F MCU of Main domain, Is CAN stack (hopefully handled by J1939-TP and ISO-TP ) supported by TI-RTOS? Any related example? In this case, is CAN socket accessible on Linux on A72 ?
    • Please check if CAN stack supports J1939-TP and ISO-TP in TI-RTOS. And tell me if customer should buy CAN Stack through 3rd party.

    Regards, 

    Jack

  • 0 in reply to Jack
    TI__Mastermind 37435 points

    Hi Jack,

    See my replies inline

    Jack said:
    If MCAN is connected to R5F MCU of Main domain, Is CAN stack (hopefully handled by J1939-TP and ISO-TP ) supported by TI-RTOS? Any related example?

    We do not certify compatibility of TI-RTOS with any 3P software. You will have to check the same with the 3P vendor. I am not aware of any example either. Having said that, TI-RTOS is getting deprecated and we are moving towards FreeRTOS from SDK 8.0 onwards, so please check compatibility with FreeRTOS (which is not owned by TI)

    Jack said:
    In this case, is CAN socket accessible on Linux on A72 ?

    DRA829 which is a related SoC will have this support in SDK 8.1 and SDK 8.2 (March 2022) but the support is not yet planned for DRA821, this can be evaluated but there are no plans right now. Technically speaking, it's quite feasible.

    Jack said:
    Please check if CAN stack supports J1939-TP and ISO-TP in TI-RTOS. And tell me if customer should buy CAN Stack through 3rd party.

    See my reply above, please check with 3P on compatibility with FreeRTOS (and SafeRTOS if safety is required)

    Regards

    Vineet