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About how to change U-Boot for customized initial DDR Configuration

Murphy Bevan
Intellectual 270 points
Other Parts Discussed in Thread: DRA829, TDA4VM

Hi,

TI support team.

Tool LINK: https://www.ti.com/lit/pdf/spracu8

From chapter-3 <Software Considerations>, Learned that two ways to update the software<updating U-boot & updating RTOS PDK>. 

step 1. Do both U-boot and RTOS changes need to be updated to the code or can only one be updated to meet the requirements?

    My understanding is that updating one of the two-way can achive the goal. right?. If it is, We choose to update U-boot code.

step 2. Rebuild the U-Boot source code, 

Target Images: 

  • tiboot3.bin from <output directory>/r5
  • tispl.bin, u-boot.img from <output directory>/a72
  • sysfw.itb from <path to tisdk>/board-support/prebuilt-images/

    Copy the above four images to the boot partition of an SD card and boot. 

     Which file <tiboot3.bin> or <tiboot3> do DDR Config ?

Conclusion:

  Please help me to check whether the previous two steps could meet the requirements for customizing DDR configurations(such as Disable CA ODT in worksheet IOControl) ?

I will append some specific changes to this Thread for further modification to meet customized DDR config. Please help to check !

Best Rgards

Murphy

  • 0
    TI__Guru**** 153220 points
    Murphy Bevan said:

         Which file <tiboot3.bin> or <tiboot3> do DDR Config ?

    tiboot3.bin that contains R5F SPL does the DDR config.

    - Keerthy

  • 0 in reply to Keerthy J
    Intellectual 270 points

    Hi Keerthy,

    Thank you for your reply.

    What i think is just need to replace the tiboot3.bin file of the SD card in boot partition, Is that enough meet the customized DDR configuration? 
    Of course, Steps are as follows.
    1.   Replacing the existing file <k3-j721e-ddr-evm-lp4-4266.dtsi>
    2.   Rebuild the U-Boot source code
    3.   Copy the tiboot3.bin file from corresponding output file directory: <output directory>/r5

    Whether the previous three steps are correct or not (Just for soluation-1 <updating U-Boot>) ?

    Regards,

    Murphy

  • 0 in reply to Murphy Bevan
    TI__Mastermind 33615 points

    Hi Murphy,

    My assumption is that you are using either TDA4VM or DRA829.

    If the total LPDDR4 memory you have available on your board design is the same as the TDA4VM EVM (4GB), then replacing the DTSI file should be the only software modification you need to make (related to DDR). 

    In that case, you are correct that you would need to 1) replace DTSI file in u-boot source; 2) re-build source; 3) copy new tiboot3.bin file to SD card

    Regards,
    Kevin