Boot Mode to be used to program the external flash

Hi,

Regarding "Do we need to keep the DSP in No Boot/Custom Boot mode (BMODE[2:0] = 000) while programming the external flash using the ICE-2000 emulator, and then change BMODE to 001 for booting from the external flash?"
>>>Yes, Your understanding is correct. it is recommended to set BMODE =0 (No Boot) when flashing an LDR file on the EV-21569-SOM. Once flash programming is completed, change BMODE[2:0] = 001 (SPI Master Boot) to boot the application from the external SPI flash.

Could you please follow the "Creating/Using Loader File" and "Flashing the Loader file" section in the "Readme_21569_SOM_POST.html". Please download and install the ADSP-2156x BSP from the below link.
download.analog.com/.../ADI_EV-2156x_EZ-KIT-Rel3.0.0.exe

Once installed, the POST Readme can be available in the below path.
[Installation directory]:\Analog Devices\EV-2156x_EZ-KIT-Rel3.0.0\EV-2156x_EZ-KIT\Examples\Power_On_Self_Test\Readme\21569\Readme_21569_SOM_POST.html

Regards,
Nandini C