We have a custom board very similar to the imx6q Sabred reference design. We used 4 MT41K512M8 DDR chips。
When we perform DDR calibration, the following is displayed.
| DDR TEST TOOL LOG |
|---|
DDR Freq: 396 MHz ddr_mr1=0x00000000
Start write leveling calibration...
running Write level HW calibration
Write leveling calibration completed, update the following registers in your initialization script
MMDC_MPWLDECTRL0 ch0 (0x021b080c) = 0x00150015
MMDC_MPWLDECTRL1 ch0 (0x021b0810) = 0x0022001B
MMDC_MPWLDECTRL0 ch1 (0x021b480c) = 0x0010001E
MMDC_MPWLDECTRL1 ch1 (0x021b4810) = 0x000D001B
Write DQS delay result:
Write DQS0 delay: 21/256 CK
Write DQS1 delay: 21/256 CK
Write DQS2 delay: 27/256 CK
Write DQS3 delay: 34/256 CK
Write DQS4 delay: 30/256 CK
Write DQS5 delay: 16/256 CK
Write DQS6 delay: 27/256 CK
Write DQS7 delay: 13/256 CK |
It seems to be stuck here, and there is no output after that.How to solve this problem?
Hi kane
such kind of errors may point to fact that ddr interface is not working at all,
so one can check signals and power with oscilloscope using guidelines of
i.MX6 System Development User’s Guide
https://www.nxp.com/docs/en/user-guide/IMX6DQ6SDLHDG.pdf
Best regards
igor
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