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CCS/AM4376: Bootloader GPMC NOR boot issue

Part Number: AM4376

Tool/software: Code Composer Studio

I use AM4376 on custom board and using CCSv6.1.3 with Non-OS project(based SYS/BIOS Industrial SDK starterware).
I want to Boot from NORFlash connected to GPMC.
So I created an API to access NO RFlash and integrated it into bootloader.
I was able to boot my custom bootloader with UART Boot mode.
I wrote the same bootloader(with TI image header) to NorFlash.
But I can not boot the bootloader from NorFlash.
I was not seen boot loader messages from UART.

1.Is there a setting that must be changed with Uartboot and NORFlash (GPMC) boot when building a boot loader?

2.timage.exe has Bootmode param. When booting from NOR (GPMC), what should be specified?

3.I confirmed the following settings, but are there any other settings to check?
 1)SYSBOOT [1-4],SYSBOOT [6,7,8,9,11]
  SYSBOOT [1-4]is 00111b,SYSBOOT [6,7,8,9,11] is match on our custom board
 
 2)CCS Post –build-steps

"${CG_TOOL_ROOT}/bin/arm-none-eabi-objcopy" -O binary "../../../binary/${ProjName}/bin/${ConfigName}/${ProjName}_${ConfigName}.out" "../../../binary/${ProjName}/bin/${ConfigName}/${ProjName}_${ConfigName}.bin" & "../../../tools/ti_image/tiimage.exe" "0x402F4000" "NONE" "../../../binary/${ProjName}/bin/${ConfigName}/${ProjName}_${ConfigName}.bin" "../../../binary/${ProjName}/bin/${ConfigName}/${ProjName}_${ConfigName}_ti.bin"

 3).lds file
I use Industrial SDK original file( ../../../examples/gcc/am43xx_boot_ccs.lds)