Hello,
According to i.MX DDR Register Programming Aids :
The DDR stress test also has a feature whereby it evaluates the write leveling values returned from calibration and increments WALAT to 1 if the values exceed a defined limit. The DDR stress test informs the user when the Write Additional latency (WALAT) exceeds the limit and should be increased by 1, and reminds the user to add it back in the customer specific initialization script if required.
| WALAT | - | 0 | 00000000 | WALAT: Write Additional latency. Recommend to clear these bits. Proper board design should ensure that the DDR3 devices are placed close enough to the MMDC to ensure the skew between CLK and DQS is less than 1 cycle. |
So, it is not recommended to set WALAT with the Stress test. It is assumed to be done automatically.
Have a great day,
Yuri.
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