Posts: 16
Joined: Tue May 03, 2016 7:55 pm

CM3L SD Card

Thu Apr 27, 2017 1:50 pm

With the CM3L I started using GPIO22-27 to connect to SC cards but then I realized those are SDO ALT1 pins.

Am I correct in guessing that SDX_CLK/CMD/DAT0-3 are what I route to my SD Card?

Are the SDX pins the default pins to connect to SD cards in the device tree?

Do I need any pullups?

Posts: 1876
Joined: Tue Jun 30, 2015 1:35 pm

Re: CM3L SD Card

Thu Apr 27, 2017 2:33 pm

Please allow me to reset you to the Compute Module IOBoard schematics ... EMATIC.pdf
And the Compute Module documentation ...

They will ansewer your question.
And yes, SDX-pins are 'default' (in regards of standard device tree) pins for SDcard interface.

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