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AM3352: CPSW switch mode during warm reset

Tony Tang
Mastermind 29412 points
Part Number: AM3352


Customer's system as below, they want to implement when node A on the network hang or reset, node B  and node C still can communicate with PC.

Set ISO_CONTROL=1 already. trigger watchdog reset on A, but on PC can't find node B and C after that. so the A node switch doesn't work as TRM described.

Any other need to be configured for this feature?

  • 0
    TI__Mastermind 27890 points
    Hi Tony,
    Please refer to Advisory 1.0.23. Ethernet Isolation is not supported and must remain disabled on this device.
  • 0 in reply to -DK-
    TI__Mastermind 29412 points

    DK,

    #1. From the description, it "MAY" lock up, not "MUST", Can I understand sometimes it will work?

    #2. If the host port is not transmitting data, it won't lock?

    #3. What is mean of the "host port", one of the 2 external port of the CPSW? or the one connect to internal bus? Or the external device?

  • 0 in reply to Tony Tang
    TI__Mastermind 27890 points

    Tony,

    Because the warm reset can be asynchronous, it's not possible to characterize all cases of if/when it will occur (hence the term "may"). The Host port in this context is the internal port, and by association, both downstream ports.

    Reset Isolation for CPSW is not supported and shouldn't be enabled.

  • 0 in reply to -DK-
    TI__Mastermind 29412 points

    DK,

    #1. I didn't see such advisory on AM437x errata, so the feature is supported on AM437x?

    #2. Any way to workaround the limitation? no matter from hardware or software? it is the key feature of customer's system to remain the whole network active even one of the node doesn't working.

    #3. If ensure host port doesn't transmitting data before issue a warm reset( trigger watchdog reset), will the 3PSW works as RESET ISOLATION.

  • 0 in reply to Tony Tang
    TI__Mastermind 27890 points
    Tony,
    1) Yes.
    2) No. This functionality can't be supported on AM335x.
    3) This cannot be guaranteed. Because the errata was identified early in the device characterization, the decision was made to de-scope the feature and characterization of same was stopped.