• State Resolved
  • Locked Locked
  • Replies 1 reply
  • Subscribers 97 subscribers
  • Views 113 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

AM62L: What's the situation when we programming efuse failed.

Gibbs Shih
Expert 6560 points

Part Number: AM62L

Hello, Expert.

As titile descrption, customer wants to know is it possible to recover AM62L once programming e-fuse failed. I think the cause should be like as below.

(1) If we stop VPP supply when keywriter programs key, that's mean efuse value may be consistent. Can AM62L boot w/ non-signature firmware?

(2) If we interrupt keywriter execution. (ex, power off the board), that's mean efuse value may be consistent. Can AM62L boot w/ non-signature firmware?

(3) Follow item (1)/(2), can we recover AM62L to initial state?

(4) How do we know keywriter write keys success or not?

 

I already check this link.

https://software-dl.ti.com/processor-sdk-linux/esd/AM62LX/12_00_00_07_04/exports/docs/linux/Foundational_Components/U-Boot/UG-Key-Writer-Lite.html

 

Thank You.

Gibbs



 

								


				
				

				
			

		

			
						
									
                			    			            
						
						
			
			
			
			                        
			

				

			


			

		


				    			

						

















	

	

					
    
	
    





		
	
  • 
		
    
			 


	
			
		
	









    
	
    
		
    
							
					
    
		
    
			
													+1
							
			
				
									
							
						
				
			
			
			
					
    
	
    
	                                    
                      
    
                        
                          TI__Guru*
                        80100 points
                      
    
                          
                   		
		
    
					
    Hi Gibbs,
    

    Please review <6.8 VPP Specifications for One-Time Programmable (OTP) eFuses> in AM62L datasheet on VPP.
    - 6.8.3 Programming Sequence
    - 6.8.4 Impact to Your Hardware Warranty
    

    For your questions:
    - #1/#2/#3, the operation is in violation with the required OTP key programming sequence, and the result is unpredictable.
    - #4, check the return status (successful or not ) when calling the key programming function.
    

    Best,
    -Hong
    
			
    

		
		
		
		
	
    
	
    
		
    
			
		
    
	
    

	            
                 	
	
    
				
		                
                
                
                
                
                
                
        		
		
				
    
			
		
    
		
		 
		
		
     
    
	
    

    
			
    
			
    
		
    

		
    
	
    •