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TDA4VM: What's the difference between tiboot3.bin

Part Number: TDA4VM

HI experts

 software-dl.ti.com/.../UG-General-Info.html

It said  "TI-u-boot is included in the SDK in <path to tisdk>/board-support" and the following files can be compiled

  • 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/

But  I  also  can build them in PDK\package\ti\build directory:

Switch to PDK\package\ti\build directory
make BOARD=j721e_evm CORE=mcu1_0 sbl_lib_mmcsd_clean
make BOARD=j721e_evm CORE=mcu1_0 sbl_mmcsd_img_clean
make BOARD=j721e_evm CORE=mcu1_0 sbl_lib_mmcsd
make BOARD=j721e_evm CORE=mcu1_0 sbl_mmcsd_img

Copy the below files 

<pdkInstallPath>\packages\ti\boot\sbl\binary\j721e_evm\mmcsd\bin\sbl_mmcsd_img_mcu1_0_release.tiimage renamed as tiboot3.bin
<pdkInstallPath>\packages\ti\drv\sciclient\soc\V1\tifs.bin

What is the difference between them(tiboot3.bin/tispl.bin/sysfw.itb) ?