IMX6ULL DRR CALIBRATION FAILED

Oman — Thu, 22 Apr 2021 10:55:13 GMT

I used ddr_stress_tester to test my pacba, but failed at calibration.

Then,I Set Voltage to 1.75, it tests success.

Q1: How do I set voltage to source code?Because when brushing machine is also failed .so it can not go to the linux system. should I modify DCD data of code on uboot?

Q2: for his failed of calibration, What might be the cause? how will we modifiy PCB?

Re: IMX6ULL DRR CALIBRATION FAILED

igorpadykov — Fri, 23 Apr 2021 00:48:23 GMT

Hi Barry

1. one can add codes to dcd header or increase voltage in uboot board file

https://source.codeaurora.org/external/imx/uboot-imx/tree/board/freescale/mx6sabresd/mx6sabresd.c?h=imx_v2020.04_5.4.70_2.3.0

2. calibration may fail due to power supplies voltages, one can check power requirements,

like ripplies in

IMX6DQ6SDLHDG, Hardware Development Guide for i.MX 6Quad, 6Dual, 6DualLite, 6Solo Families of Applications Processors

Best regards
igor

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IMX6ULL DRR CALIBRATION FAILED

Re: IMX6ULL DRR CALIBRATION FAILED