HI there,
In J721 processor sdk 08_06_00_11 rtos vision_apps, the mem map for C7x_1 as L3 MEM is defined and used as:
in vision_apps/platform/j721s2/rtos/app_mem_map.h.
This occupies almost the entire MSMC ram.
However, in linux dts file /ti-processor-sdk-linux-j721s2-evm-08_06_00_10/board-support/linux-5.10.162+gitAUTOINC+76b3e88d56-g76b3e88d56/arch/arm64/boot/dts/ti/k3-j721s2-main.dtsi, the MSMC is partitioned as