[FAQ] PROCESSOR-SDK-J721E: How to use DRU channels for config data in VISS

Brijesh Jadav

For heterogeneous camera processing, VISS internally uses UDMA channel for saving and restoring the configuration almost on every frame. This article explains how VISS driver can be changed to use DRU channels for saving and restoring configuration.

over 3 years ago

0 Brijesh Jadav over 3 years ago

TI__Guru**** 490565 points

Please follow below steps to use DRU channels in the VISS driver.

Apply attached patch on top of ti-processor-sdk-rtos-j721e-evm-08_02_00_05\pdk_jacinto_08_02_00_21 folder to enable support DRU channels in VISS driver.
In the file ti-processor-sdk-rtos-j721e-evm-08_02_00_05\vision_apps\utils\hwa\src\app_hwa.c, enable DRU channels from the application, as show below
- /* Set configThroughUDMA to true to support multi handle */
  initPrms.configThroughUdmaFlag = true;
  initPrms.useDru = true;
By default, there are two DRU channels allocated for MCU2_0. This patch will one of the DRU channel. If required, allocated additional DRU channels for MCU2_0, as explained in https://e2e.ti.com/support/processors-group/processors/f/processors-forum/1097038/faq-tda4vm-workflow-and-resource-allocation-build-flow-for-sysconfig-tool
If using SBL boot flow,
- comment out the call to setup_main_r5f_qos in the file PSDKLA/board-support/u-boot-2021.01+gitAUTOINC+44a87e3ab8-g44a87e3ab8/arch/arm/mach-k3/j721e_init.c
- Rebuild uboot and SPL files
- Copy newly uboot and SPL files BOOT partition of the SD card.
If using SBL boot flow,
- comment out call to setup_main_r5f_qos in ti-processor-sdk-rtos-j721e-evm-08_02_00_05\pdk_jacinto_08_02_00_21\packages\ti\boot\sbl\soc\k3\sbl_qos.c
- rebuild SBL and copy updated SBL to SD card
Rebuild vision apps and run it on the EVM.

/cfs-file/__key/communityserver-discussions-components-files/791/PDK_5F00_VISS_5F00_Support_5F00_For_5F00_DRU_5F00_Ch.zip

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[FAQ] PROCESSOR-SDK-J721E: How to use DRU channels for config data in VISS