How to check there is no impact of ERR050070 MMDC: Hardware Write Leveling Calibration Error bits

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How to check there is no impact of ERR050070 MMDC: Hardware Write Leveling Calibration Error bits

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shaot
Contributor II

Hi, I am using i.mx6ull and Yocto (https://github.com/varigit/linux-2.6-imx/tree/imx-rel_imx_4.1.15_2.0.0_ga-var03).

It seems that there is a errata of MMDC, so I want to confirm this errata does not affect anything for our products including past products.

From the workaround in errata:

>If the hardware write leveling was successful, the MMDC PHY Write Leveling HW Error Register
(MMDC_MPWLHWERR) will contain non-zero values for each byte lane used. A zero value for
an active byte lane indicates that a hardware write leveling error occurred. Software should use
MMDC_MPWLHWERR as the error indication instead of MMDC_MPWLGCR.

 

This description says software should use MMDC_MPWLHWERR instead of MMDC_MPWLGCR.

Would you tell me how to check whether MMDC_MPWLHWERR is used as error indication?

What will occur if we use MMDC_MPWLGCR as the error indication?

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igorpadykov
NXP Employee
NXP Employee

Hi shaot

 

BSPs and Yocto (https://github.com/varigit/linux-2.6-imx..)  do not use

Write Leveling Calibration as described in description of ERR050070 MMDC in

Chip Errata for the i.MX 6ULL

Write Leveling Calibration is used in DDR test where all necessary workarounds are implemented :

https://community.nxp.com/t5/i-MX-Processors-Knowledge-Base/i-MX-6-7-DDR-Stress-Test-Tool/ta-p/11082...

 

Best regards
igor

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540件の閲覧回数
igorpadykov
NXP Employee
NXP Employee

Hi shaot

 

BSPs and Yocto (https://github.com/varigit/linux-2.6-imx..)  do not use

Write Leveling Calibration as described in description of ERR050070 MMDC in

Chip Errata for the i.MX 6ULL

Write Leveling Calibration is used in DDR test where all necessary workarounds are implemented :

https://community.nxp.com/t5/i-MX-Processors-Knowledge-Base/i-MX-6-7-DDR-Stress-Test-Tool/ta-p/11082...

 

Best regards
igor

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shaot
Contributor II

Thank you for the quick response.

I was relieved that our software does not use the function.

 

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