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TDA4VM: What is the "DM binary" used for in Linux SDK V7.1's U-Boot project?

Part Number: TDA4VM

Hi experts, 

i can't start my mcu0_0 at SPL stage. So i check the source code :

 ti-processor-sdk-linux-j7-evm-07_01_00_10/board-support/u-boot-2020.01+gitAUTOINC+3c9ebdb87d-g3c9ebdb87d/arch/arm/mach-k3/common.c     line:209

if (!fit_image_info[IMAGE_ID_DM_FW].image_start)
    size = load_firmware("mcur5f0_0fwname", "mcur5f0_0loadaddr",&loadaddr);

When i try to build the u-boot , the " DM binary" has already included.  And i don't know what is it ?

Image 2 (dm)
Description: DM binary
Created: Tue Dec 1 13:37:21 2020
Type: Firmware
Compression: uncompressed
Data Size: 195880 Bytes = 191.29 KiB = 0.19 MiB
Architecture: Unknown Architecture
OS: Unknown OS
Load Address: 0xa0000000

Could you please give me more information about that?

Thanks,

Hutian