This article explains how to build and run DSS example.
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This article shows how to build and run DSS example on eDP using SBL flow. Similar method (Step-3 onwards) can be used to run any PDK examples using SBL.
Please find attached patch which allows running DSS example from uboot.
Please apply this patch in folder ti-processor-sdk-rtos-j721e-evm-07_01_00_11\pdk_jacinto_07_01_00_45 and then follow steps to run DSS example from uboot/SPL.
After few seconds, you should see images getting displayed on eDP output.
I have included Pixel clock fix in this patch, so you would need to apply only this patch.