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MCU-PLUS-SDK-AM263PX: UART Uniflash tool failure to write SBL to flash

Part Number: MCU-PLUS-SDK-AM263PX
Other Parts Discussed in Thread: UNIFLASH

Tool/software:

Hello, 

I am using a AM263PX on a custom board using SDKv10.01.00.31. The board has a QSPI flash which I am trying to program using the UART flash tools provided in the SDK. My goal is to use the uart_uniflash.py tool from the SDK to execute my custom .cfg file. The file has the following commands 


--flash-writer=C:/ti/mcu_plus_sdk_am263px_10_01_00_31/tools/boot/sbl_prebuilt/am263px-lp/sbl_uart_uniflash.release.tiimage

# SBL
--file=C:/ti/mcu_plus_sdk_am263px_10_01_00_31/tools/boot/sbl_prebuilt/am263px-lp/sbl_ospi.debug.tiimage --operation=flash --flash-offset=0x0

# Appimage
--file={path_to_my_appimage}.appimage --operation=flash --flash-offset=0x81000


After setting the boot pins to UART mode, when I run the flash script, the first command (writing the flash writer) always executes successfully, but then I get stuck on the SBL stage. The EVM never responds to the xmodem send. 

Thanks!