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Original question:

SK-AM64B: Backup Boot Mode Ethernet not Working

SK-AM64B: Cannot boot via Ethernet as backup boot mode.

Federico Gobetti
Prodigy 60 points
Part Number: SK-AM64B

Tool/software:

Hello everybody,

we cannot make the system boot via Ethernet Backup Boot Mode.

We put bootmode pins as in figure, selecting SD card as primary mode and ethernet as backup mode configured with RGMII with internal Tx delay. We left the SD card tray empty and powered on.

We monitored the traffic but we could only see some LLDP packet, without any BOOTP request, as shown below.

Setting Ethernet RGMII as primary boot mode, instead, seems to work fine with the configuration in the figure below.

In this condition we can see the BOOTP request and the TFTP image transfer from our host to the SK-AM64B board, and the U-boot prompt on the console.


How can we make the backup ethenet boot working?

BR,
Federico

  • 0
    TI__Expert 6700 points

    Hi Federico,

    Federico Gobetti said:
    We monitored the traffic but we could only see some LLDP packet, without any BOOTP request, as shown below.

    To confirm, the mac address showing from these LLDP packets are not TI MAC addresses. 

    Please allow us a day or two to try to reproduce your test case.

    -Daolin

  • 0 in reply to Daolin Qiu
    TI__Expert 6700 points

    Update:

    I have reproduced the same issue on my setup

    1. Test Ethernet primary boot with SD as backup with the same boot switch configuration you shared

    This works as expected as you indicated

    2. Test Ethernet as backup boot with SD as primary with the same boot switch configuration you shared

    This does not work with no packets showing up on Wireshark. 

    Additional observations

    1. Ethernet boot as primary bootmode only works when the link info bit (bit 7) is set. If not set, Ethernet boot still fails (Wireshark also shows no packets)

    2. Ethernet boot as secondary bootmode does not appear to have a link info bit configuration

    I believe there may be something related to this link info bit configuration that may be at fault. I'm trying to get more details about this with the developer.

    If I don't respond by early next week please ping this thread again

    -Daolin