Tool/software:
Processor SDK RTOS v11.0.0.6 on J721E and need clarification on DSS settings for both LINUX+RTOS mode in J721E SDK.
I am working J721E EVM and trying to bring up the DSS (Display Subsystem) using the DSS Display Test App under the Linux + RTOS (remoteproc) setup.
I ’m looking for a step-by-step guide or instructions to: Build and run the DSS Display Test App on the J721E platform and Using Linux on A72 (rootfs/boot) and RTOS on R5F.
The Current Setup:
Processor: TI J721E
OS: Linux SDK (PSDKLA) with RTOS binaries
Using remoteproc to load R5 firmwares
tidss kernel module is built and loaded (CONFIG_DRM_TIDSS=m)
DSS nodes may not be active in the current device tree
No HDMI or LCD output currently detected (modetest fails)
/dev/dri/card0 exists, but no display connectors visible
RTOS firmware for DSS is available but not executing correctly
Issues faced:
modetest -M tidss -c fails: "No such file or directory"
Display output not working — unsure if:
Device tree lacks DSS node config
Display is mismatched or not detected
DSS firmware or drivers are not running correctly
Need confirmation: Can this be achieved without modifying SBL or booting from SD card?
Could someone provide:
A working example or guide to bring up the DSS test app
The required device tree modifications for DSS (Linux side)
The necessary RTOS firmware or linker settings (if any)
Clarification on whether SBL patching or SD boot is mandatory
Moreover, a working example for vision apps in RTOS without camera feed is ok.
And finally, tips on debugging DSS display on J721E with Linux + RTOS.
Thanks and regads
Firdose
