Ask about DDR2 initialization problem

arm9dzgc

Ask about DDR2 initialization problem [Copy link]

Use AXD to debug the Helper2416 core board. After the software initializes DDR2 (NT5T32M16EG), it is found that the external memory is unstable. Use the program running at address 0x00000000 to initialize DDR2. After initializing DDR2, call the program to run at 0x30000000. It is found that sometimes single-step execution also changes the memory. Later, I simply stopped running the program in DDR2 and refreshed DDR2 directly. I found that the content was also changed. For example, the original content was: 0x30000000 555555560 55555564 55555568 5555556C 0x30000010 55555570 55555574 55555558 5555555C 0x30000020 ... After right-clicking Refresh, sometimes the content becomes: 0x30000000 555555558 5555555C 555555560 55555564 0x30000010 55555568 5555556C 55555570 55555574 0x30000020 ... Could you tell me what is the reason? Is there any initialization program for NT5T32M16EG?

spacexplorer

There is an assembler called lowlevel.s in uboot for memory initialization. When you debug, it is recommended to run it with uboot first, and then run it after initializing the memory.

arm9dzgc

spacexplorer posted on 2018-7-15 14:11 There is an assembly program called lowlevel.s for memory initialization in uboot. When you debug, it is recommended to run it with uboot first, initialize the memory and then...

Thank you!