iMX7 Sabre SD_VSEL

[brianpaiva]

We set GPIO1_IO08 mux to ALT1 for SD1_VSELECT, but when we set uSDHCx_VEND_SPEC.VSELECT to 1 it does not switch to 1.8 Volts and the DLSL[0-3] data lines stay low.

[brianpaiva]

Yuri or anyone else, what else could I try based on the new information that I gave above?

[Yuri]

Hello,

  As I understand SD power voltage NVCC_SD1 may be set correctly.

Data lines should be checked in waveforms, during operation.  

Regards,

Yuri.

[Yuri]

Hello,

   Is SD_VSEL of the PMIC changed ?

Is it possible to try software modification of PMIC SD output voltage configuration ?

Have a great day,
Yuri

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[brianpaiva]

YuriMuhin_ng‌ I just got back to this problem.  I set uSDHCx_VEND_SPEC.VSELECT to 1 and confirmed that SD_VSEL of the PMIC changed by measure C49 next to U4 to be 1.8V.  I also measured pin 9 and pin 1 on the SD connector J6 to only be around 0.8V.  When uSDHCx_VEND_SPEC.VSELECT is set to 0, I measure C49 and pins 9 and 1 to be 3.3V.