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DM8148 EVM - DDR & memory map

ranchu
Guru 20755 points

Hello,

I am using DM8148 EVM , which is supposed to have 1GB DDR. 

1. If it is 1GB why the default u-boot configuration for DDR is stated as DDR 512M ? Why Do we not use the full DDR (1GB) but only half of it ?

2. App notes DM81XX_DVR_RDK_MEMORY_MAP.pdf section for DM814X shows graph of 0x8000000 <---> 0xb0000000 <---> 0xc0000000 , Why is it titled as 512M if the distance between 0xc0000000 to 0x80000000 is larger than 512M ? Is it because there are holes in between ?

3. according to http://processors.wiki.ti.com/index.php/EZSDK_Memory_Map , section about DM814x, it seems that for 1GB memory 0x80000000 to 0x9fffffff , and 0xa0000000 - 0xbfffffff , both point to the same physical memory, so I don't understand how it can shows in DM81XX_DVR_RDK_MEMORY_MAP.pdf  memory map as if the addresses in the second part point to different physical memory.

4. How shoulkd I define  PG2_1_DMM_LISA_MAP__X registers ? Should they described the memory as contigious or better not  ? 


Thanks for clarifications,
Ran



								


				
				

				
			

		

			
						
									
                			    			                        
						
						
			
			
						
			                        
			
			
				
			  
			

			     
			

		


				    			

						
















	

	

					
    
	
    





		
	
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                          TI__Guru****
                        170625 points
                      
    
                          
                   		
		
    
					
    Ran,
    

    On the Mistral EVM DM814x/AM387x PG2.1 (http://www.ti.com/tool/tmdxevm8148), the DDR3 memory is 1GB.
    

    The EZSDK 5.05.02.00 u-boot by mistake report it as 2GB, and this is fixed with the below u-boot patch:
    

    http://arago-project.org/git/projects/u-boot-omap3.git?p=projects/u-boot-omap3.git;a=commit;h=f9ee129775caeb7dc494c5bf0f4ba69ceab34950
    

    Ran S. said:
    1. If it is 1GB why the default u-boot configuration for DDR is stated as DDR 512M ? Why Do we not use the full DDR (1GB) but only half of it ?
    

    May be we have the same error report in the DVR RDK u-boot. You can compare with the EZSDK.
    

    Regards,
    Pavel
    
			
    

		
		
		
		
	
    
	
    
		
    
			
		
    
	
    

	            
                 	
	
    
				
		                
                
                
                
                
                
                
        		
		
				
    
			
		
    
		
		 
		
		
     
    
	
    

    
			
    
			
    
		
    

		
    
	
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