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J784S4XEVM: [J784S4EVM] DP Monitor Error

TAEHO KIM
Prodigy 30 points

Part Number: J784S4XEVM

When the EVM board finishes booting, the log appears as shown below, and no monitor output is displayed.

j784s4-evm login:
[   19.907859] platform connector-dp0: deferred probe pending: platform: supplier regulator-dp0-prw not ready
[   19.917516] platform connector-dp1: deferred probe pending: platform: supplier regulator-dp1-prw not ready
[   19.927164] platform regulator-dp1-prw: deferred probe pending: reg-fixed-voltage: can't get GPIO

I am using the "HP EliteDisplay E243i (1FH49AA)" monitor.

								


				
				

				
			

		

			
						
									
                			    			    			            
						
						
			
			
			
			                        
			

				

			


			

		


				    			

						

















	

	

					
    
	
    





		
	
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                          TI__Guru
                        59533 points
                      
    
                          
                   		
		
    
					
    Hi Taeho,
    

    Please check the uEnv.txt in the boot partition. If there is a name_overlays environment variable defined, please comment out.
    

    Regards,
    

    Takuma
    
			
    

		
		
		
		
	
    
	
    
		
    
			
		
    
	
    

	            
                 	
	
    
				
		                
                
                
                
                
                
                
        		
		
				
    
			
		
    
		
		 
		
		
     
    
	
    

    
			
    
			
    
		
    

		
    
	
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													0
							
			
				
									
							
						
				
			
			
			
												
						in reply to Takuma Fujiwara
					
									
    
	
    
	                                    
                      
    
                        
                          Prodigy
                        30 points
                      
    
                          
                   		
		
    
					
    Thank you for your answer.
    

    As in your answer, if you comment out the name_overlays environment variable,
    

    output will appear on the monitor.
    

    "#name_overlays=ti/k3-j784s4-evm-ethfw.dtbo ti/k3-j784s4-vision-apps.dtbo"
    

    But, when running the ti ovx tutorial, the following error occurs.
    

    root@j784s4-evm:/opt/vision_apps# ./vx_app_tutorial.out
    APP: appInit() !!!
    APP: appCommonInit() !!!
    APP: Init ... !!!
     56.609544 s: APP_LOG: ERROR: Unable to map memory @ 0xaf000000 of size 262144 bytes !!!
    APP: ERROR: Log writer init failed !!!
     56.609610 s: MEM: Init ... !!! app_mem_linux_dma_heap.c
     56.609683 s: MEM: ERROR: Failed to initialize DMA HEAP [/dev/dma_heap/carveout_vision_apps_shared-memories] !!!
     56.609695 s: MEM: Init ... Done !!!
    APP: ERROR: Memory init failed !!!
    APP: Init ... Done !!!
    APP: appCommonInit() return -1.
    root@j784s4-evm:/opt/vision_apps#
    


    What should I do to solve this problem?
    
			
    

		
		
		
		
	
    
	
    
		
    
			
		
    
	
    

	            
                	
	
    
				
		                
                
                
                
                
                
                
        		
		
				
    
			
		
    
		
		 
		
		
     
    
	
    

    
			
    
			
    
		
    

		
    
	
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													+1
							
			
				
									
							
						
				
			
			
			
												
						in reply to TAEHO KIM
					
									
    
	
    
	                                    
                      
    
                        
                          TI__Guru
                        59533 points
                      
    
                          
                   		
		
    
					
    Hi Taeho,
    

    If running the TIOVX tutorials/demos please keep the name_overlays. This is a software architecture feature where you can have display controlled from A72 (running Linux) or R5F (running RTOS + TIOVX). If the overlay is applied, it disables display from A72, allowing R5F/RTOS/TIOVX to use display. If overlay is taken away, then A72 Linux will control Linux, so you will get the weston/wayland compositor.
    

    It is the choice of the user to choose whether display driver should go through R5F or A72.
    

    Regards,
    

    Takuma
    
			
    

		
		
		
		
	
    
	
    
		
    
			
		
    
	
    

	            
                 	
	
    
				
		                
                
                
                
                
                
                
        		
		
				
    
			
		
    
		
		 
		
		
     
    
	
    

    
			
    
			
    
		
    

		
    
	
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													0
							
			
				
									
							
						
				
			
			
			
												
						in reply to Takuma Fujiwara
					
									
    
	
    
	                                    
                      
    
                        
                          Prodigy
                        30 points
                      
    
                          
                   		
		
    
					
    thank you for your answer
    
			
    

		
		
		
		
	
    
	
    
		
    
			
		
    
	
    

	            
                	
	
    
				
		                
                
                
                
                
                
                
        		
		
				
    
			
		
    
		
		 
		
		
     
    
	
    

    
			
    
			
    
		
    

		
    
	
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