IMX6ULL DRR CALIBRATION FAILED

[Oman]

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?

[igorpadykov]

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=...

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 Applic...

Best regards
igor