iMX6ull DDR Test Tool

[okuda]

Hi.

Currently, as shown in the attached image, a board using iMX6ull is being used for memory testing using DDR Test Tool.

Which register of iMX6ull corresponds to the value of MR1 (setting value framed in red)?

What effect does changing this value have?
（The default value is 0, and 8031 in the image is a meaningless value.）

Best regards,
Koji Okuda

[okuda]

Hi.

We suspected DDR memory from the phenomenon that kernel locks.

As we proceeded with the investigation, we found the following.

Currently, we are using it on demand, and when the clock setting is set to 198MHz, we found that the kernel cannot start normally.
With the fixed setting to high performance, the kernel starts fine.

Anything wrong when the clock setting is set to 198MHz?

Best regards,
Koji Okuda

[Rita_Wang]

You can refer to this https://community.nxp.com/t5/i-MX-Processors-Knowledge-Base/iMX-8M-Mini-Register-Programming-Aid-DRA...

I think you do not have proper clock for the 198MHz

[okuda · Accepted solution]

Hi b45499

The explanation was insufficient.
198MHz is the CPU core clock setting, not the DDR clock.

I figured out what was causing the lock.
VDD_ARM voltage was too low when CPU core clock was set to 198MHz.

Best regards,
Koji Okuda