• State TI Thinks Resolved
  • Locked Locked
  • Replies 9 replies
  • Answers 3 answers
  • Subscribers 99 subscribers
  • Views 992 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

AM5706: UART boot character

user4973896
Expert 1555 points
Part Number: AM5706

Just like power-on, the AM335X without a program prints C. What letters does the AM570X print? What do the different letters mean?why my board print "JE!"， Is there something wrong！

  • 0
    TI__Guru**** 393215 points

    No, AM57x UART boot is different from AM335x. What you see is normal. See this thread for a discussion on UART boot procedure: e2e.ti.com/.../1888010

  • 0 in reply to Biser Gatchev-XID
    Expert 1555 points

    Set SYSBOOT[5:0] is 000001, boot from usb, after the computer is connected to USB, the computer manages other devices to display VAYU, but will continue to refresh。why？iS there any document about  USB debug.Besides,I find  when i  plug UART3 tx and  rx  and  gnd to PC,my board will be powered on.

  • 0 in reply to user4973896
    TI__Guru**** 168411 points

    HI,

    user4973896 said:
    Set SYSBOOT[5:0] is 000001, boot from usb, after the computer is connected to USB, the computer manages other devices to display VAYU, but will continue to refresh。

    AM5706 ROM is waiting for the USB host to transfer the bootloader image. Refreshing is because ROM retries after wait timeout.

    For details on how to use USB peripheral boot on AM5706, please refer to the following training video.

    training.ti.com/am57x-dra7x-dfu-boot-mode-with-linux-host

  • 0 in reply to Bin Liu
    Expert 1555 points

    1、The computer manager USB is refreshing too fast, always flashing。so there is no wait time 。Does this mean that there is a problem with the hardware?What driver do I need to install?

    2、why i plug the UART3_TXD,UART3_RXD,and gnd to PC,the power led can be lighted？

    3、in the uart boot ，there is a process is to reset the evm，i connect the resetn to gnd ，but no response。

    4、how to communicate with you directly！

    5、see pic  below ，DFU-UTIL DOES currently only support DFU verision 1.0，why？the second stage can not proceed！so i can not download the program to my custom board！

  • 0 in reply to Bin Liu
    Expert 1555 points

    we use AM57x  SDK 06_01_00_08, kernel  4.19，but we get a problem .WHY? HOW TO SOLVE?

  • 0 in reply to user4973896
    TI__Guru 69657 points

    Hi user4973896,

    looks like you are able to get SPL loaded via USB DFU which is a good first step.
    The error you get "usb_gadget_initialize failed" points to an issue with SPL not being configured correctly for USB gadget operation.

    Did you go through the training materials Bin pointed to?
    https://training.ti.com/sites/default/files/docs/AM57x-DFU-boot-SLIDES.pdf

    One step is to enable CONFIG_SPL_DFU for U-Boot. Was this done?

    It sounds like you are working with a custom board. Do you have any DRA7/J6/AM57xx TI EVM you could try out those steps to have a known-good starting point?

    Regards, Andreas

  • 0 in reply to Andreas Dannenberg
    Expert 1555 points

    Is this a problem because there is a problem with DDR?What   printing information appears shows that DDR is good？

    2、Now I use type A usb interface，there is no id PIN,is this the reason the device can be recognized be USB device.i only connect

    usb1_dp,usb1_dm gnd to  CPU.

  • 0 in reply to Andreas Dannenberg
    Expert 1555 points

    i USE USB1,usb2.0  TYPE a USB interface.

  • 0 in reply to user4973896
    TI__Guru 69657 points

    Hi user4973896,

    first, have you been able to re-create a successful USB DFU U-Boot loading on a TI EVM as per the earlier suggestion?

    user4973896 said:
    Is this a problem because there is a problem with DDR?What   printing information appears shows that DDR is good？

    Are you referring to the U-Boot SPL screenshot you sent earlier? One thing that was printed there is "Trying to boot from DFU" which gets printed towards the end of SPL execution. DDR is usually setup early on during SPL execution, specifically as part of board_init_f(). The fact that you got a "Trying to boot from DFU" print means you are already well beyond DDR setup (which also gets put into use by U-Boot for global data, stack, etc.) so that means that DDR is likely not your issue.

    user4973896 said:

    2、Now I use type A usb interface，there is no id PIN,is this the reason the device can be recognized be USB device.i only connect

    usb1_dp,usb1_dm gnd to  CPU.

    I'm not sure I understand what issue you are having. As per your earlier screenshot you have already been able to successfully load SPL via USB DFU using the device's first USB interface (USB1) interface I suppose, is that right? If so, those same connections will work continuing the boot  chain to U-Boot, assuming U-Boot is configured properly. And yes you only need DP/DM anf GND really. The AM57x would need to be connected to the host PC via a type-A connector. But again, seems like you already had that working? What I am missing here? Please provide additional details to clarify.

    Regards,
    Andreas