LP-AM261: LP AM261 cann't boot from OSPI flash！

Tool/software:

My environment:

• board: LP AM261 PROC193E1 
• CCS12.8.1 
• SDK: mcu_plus_sdk_am261x_10_00_01_10
• uniflash 9.1.0

Then I took the following steps:

1. Set DevBoot Mode(SW4 0010) and repower the board.
2. Compile my test program(uart outputs and LED blinks) to generate a .appimage file
3. Open Uniflash 9.1.0 and load the image files. It shows "Program Load completed successfully"

        4.  Set DevBoot Mode(SW4 0010)， OSPI(8S) - Octal Read Mode(SW4 0011) and repower the board respectively. Both of the boot modes cann't load the program from flash.

Additional notes: 

• I set UART boot mode, and use the command "python uart_uniflash.py -p comX --cfg=sbl_prebuilt/am261x-lp/default_sbl_ospi.cfg". It can flash successfully but cann't boot from flash after setting OSPI boot mode and repowering.
•  When I use LP AM263X, the AM263 board can boot from QSPI in QSPI boot mode.
• My board used a customer QSPI flash, I modified flasher_jtag_uniflashxxx and Uniflash can load successfully. But my board can’t boot from QSPI flash.

The support I need:

• Please run the steps I took  with your system environment to check the reasons. I need to know if the toolchain is reliable. 
• If the board use QSPI flash, can it only boot from flash in OSPI Serial NAND(4s) - Quad Read Mode? Can it boot from Devboot Mode? I want a mode which supports Uniflash to flash the program and supports boot from QSPI, is it possible?