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C6657 DDR leveling has failed, STATUS = 0x40000064

user5306918
Intellectual 435 points

在C6657自制板上，上电第一次运行memory test例程，结果是正确的。但是，在不断电的情况下重新debug 再运行memorytest的例程就报错，提示

leveling has failed, STATUS = 0x40000064，这个错误。如果重新上电就又正确了，STATUS = 0x40000004。查看了ddr文档，两位寄存器值为1了。

5
RDLVLTO
R
Read Data Eye Training Timeout
• 0 = Reset value
• 1 = Read data eye training has timed out
4
WRLVLTO
R
Write Leveling Timeout
• 0 = Reset value
• 1 = Write Leveling has timed out
The leveling timeout indications are bits 4, 5, and 6
in the DDR3 memory controller status register at address 0x21000004. If any of these bits are set to a 1,
leveling has failed. This normally means there is either a hardware problem or the initial leveling values
are incorrect.

请问这可能是什么原因？