DRA821U: Failed to boot from SD card when the program access to RTI and MCSPI2 register

Hi team,

On DRA821 EVM, we failed to boot from SD card.

We are using enet_nimu_example which is in PDK as a base.
The program which I want to run on DRA821U access to RTI and MCSPI2 register.

Of course the original example file can run successfully, but the program image which I added the 2 features listed above can't boot from SD card.
However, the modified program can boot from direct load via CCS.

I have no idea to explain this, please help us.

Environment:
 bios_6_83_02_07
 pdk_j7200_07_03_00_29 (これのenet_nimu_exampleをベースに作成しています。)
 ti-cgt-arm_20.2.0.LTS
 xdctools_3_61_04_40_core

Best Regards,
Junpei Kishi