Sometimes it does not recognize the SD on the customer board.
Customer uses the i.MX6SX and Linux Version： 4.1.15-2.0.
The log is the follows.
sdhci: Tuning procedure failed, falling back to fixed sampling clock
mmc2: tuning execution failed
Waiting for removable media...
mmc2: error -5 whilst initialising SD card
Is there a similar problem?