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Original question:

J721EXCPXEVM: Does not boot

J721EXCPXEVM: J721EXCP01EVM does not boot from sd

WBB
Prodigy 40 points
Part Number: J721EXCPXEVM


Hi,

I did not find any sd card included on my
J721EXCP01EVM and
J7200XSOMG01EVM


So I created one using instructions from software-dl.ti.com/.../Processor_SDK_Linux_Formatting_SD_Card.html.

Now I have almost the same setup as the related thread except for the som (J7200XSOMG01EVM), needed files are on boot and rootfs partition, dip switches are set to boot from sd but still

experiencing the same problem. I understand that the potential solution is to reset som; does that mean pressing the blue button on it as shown on the attached image (I  still  can't boot from the sd card after I did that).

thanks,

wbb

  • 0
    TI__Mastermind 42135 points

    Hi,

    WBB said:
    I understand that the potential solution is to reset som; does that mean pressing the blue button on it as shown on the attached image

    I guess what he meant was to remove the SOM board from CP board and then put it back, make sure all the screws are properly tighten.

    Also, can you check other boot modes as well? Try putting it in UART mode, open the serial console for MCU R5 and see if you can see character "c" getting printed on the console.

    Regards,
    Parth

  • 0 in reply to Parth Nagpal
    Prodigy 40 points

    I tried putting it in uart mode  as shown on the image but I don't see 'C' characters. I've checked as well if the SOM board is properly  place into the CP board.

    Best regards,

    WBB

  • 0 in reply to WBB
    Prodigy 40 points

    I  was using the wrong uart; I've switch to MCU_UART  and  /dev/ttyUSB1   and now I can see the "C"  characters

  • 0 in reply to WBB
    Prodigy 40 points

    This  part seems to work for my set-up : 

    $ sb --xmodem $OUT_R5/tiboot3.bin > $UART_BOOT_MCU_UART < $UART_BOOT_MCU_UART
$ sb --ymodem $SYSFW_ITB > $UART_BOOT_MCU_UART < $UART_BOOT_MCU_UART


    But I couldn't make the rest of the items below to work, plus the original problem that it does not boot from sd.
    No activity is detected for MAIN_UART when configured to boot in uart or sd.
    
$ sb --ymodem $OUT_AXX/tispl.bin > $UART_BOOT_MAIN_UART < $UART_BOOT_MAIN_UART
$ sb --ymodem $OUT_AXX/u-boot.img > $UART_BOOT_MAIN_UART < $UART_BOOT_MAIN_UART
  • 0 in reply to WBB
    TI__Mastermind 42135 points

    Hi,

    WBB said:
    I  was using the wrong uart; I've switch to MCU_UART  and  /dev/ttyUSB1   and now I can see the "C"  characters

    Is this a consistent on multiple boots? Or does it fail sometime? If this is consistent, then the SOM placement is proper. In that case can you please send across the screenshot of the contents of your SD card? Also, can you mention the details of  SD Card you are using (vendor and size of the card)?

    Regards,
    Parth