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iMX7D SDIO tuning debugging

Question asked by Thomas Kofoed Hansen on Jun 15, 2018
Latest reply on Jun 18, 2018 by Thomas Kofoed Hansen

We have trouble getting our SDIO interface to an external Wifi Module to function stably. Everything points to a timing issue, as we can influence the error rate by cooling/heating the processor. The interface has a tuning mechanism to add delay to the receiving clock but we are unsure if this works correctly.


There is one register (uSDHCx_CLK_TUNE_CTRL_STATUS) that could help us but that register is a read only which will always just return the power-reset value, which makes it completely useless.


Is there another way to get some information about the tuning results (not only success/fail)?


How much of the tuning process is handled by software and what is handled automatically be hardware?