TDA4VM: DDR_SHARED_MEM address

wenyu chen

Part Number: TDA4VM

HI, TI teams:

software: ti-processor-sdk-rtos-j721e-evm-07_03_00_07

1) vision_apps/apps/basic_demos/app_tirtos/tirtos_qnx/gen_linker_mem_map.py file ,the DDR_SHARE_MEM address is 0xB8000000

2). psdkqa/qnx/sharedmemallocator/resmgr/SharedMemoryAllocator.c, the shared mem address is 0xB8000000 too.

3), but in mcusw/mcuss_demos/mcal_config/CddIpc_Demo_Cfg/output/generated/soc/j721e/mcu1_0/src/Cdd_IpcCfg.c file, the shared memory address is 0xaa000000.

QA: from 1) and 2) , i get the shared memory start address is 0xB8000000, but why the 3) shared memory start address is 0xaa000000 ?

please give me some points, thanks!

over 3 years ago

0 Suman Anna over 3 years ago

TI__Guru** 112485 points

Hi Wenyu,

Vision Apps needs additional memory for all its functional needs and therefore uses a different memory map compared to the non-Vision Apps usecases.

The Cdd IPC memory configuration is provided to match the non-Vision Apps usecase. Note that the RTOS to RTOS IPC memory region needs to be exactly the same on all RTOS cores, so if you were to run Vision Apps only on some cores, you would have to adjust the memory map and the IPC region used on all other non-VisionApps firmwares as well.

Please also see the following link in RTOS SDK documentation for additional info,

https://software-dl.ti.com/jacinto7/esd/processor-sdk-rtos-jacinto7/07_03_00_07/exports/docs/psdk_rtos/docs/user_guide/developer_notes_memory_map.html#

regards

Suman

Processors

Processors forum

TDA4VM: DDR_SHARED_MEM address