Enable additional SD interfaces on Colibri iMX6

Technical Support
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1

I have a Colibri iMX6 board with 2 SD card sockets connected on following pins as recommended in Colibri iMX6 Datasheet (http://docs.toradex.com/102075-colibri-imx6-datasheet.pdf):

  • SD1_CD_B: pin 43

  • SD1_CLK: pin 47

  • SD1_CMD: pin 190

  • SD1_DATA0: pin 192

  • SD1_DATA1: pin 49

  • SD1_DATA2: pin 51

  • SD1_DATA3: pin 53

  • SD1_WP: pin 28

  • SD2_CD_B: pin 174

  • SD2_CLK: pin 93

  • SD2_CMD: pin 69

  • SD2_DATA0: pin 98

  • SD2_DATA1: pin 106

  • SD2_DATA2: pin 130

  • SD2_DATA3: pin 99

  • SD2_WP: pin 180

The first SD card (SD1) works well but I don’t get the second SD card (SD2) running. I tried to add following registry keys as described in High performance, low power Embedded Computing Systems | Toradex Developer Center

[HKEY_LOCAL_MACHINE\Drivers\BuiltIn\USDHC2\Pinout_Default]

  • “colibripin_99”=“altfn=0”
  • “colibripin_130”=“altfn=0”
  • “colibripin_106”=“altfn=0”
  • “colibripin_98”=“altfn=0”
  • “colibripin_69”=“altfn=0”
  • “colibripin_174”=“altfn=6 dir=in”
  • “colibripin_180”=“altfn=6 dir=in”
  • “colibripin_93”=“altfn=0 dir=out”

Still the driver is not being loaded for SD2. Are there any other registry settings needed?

2

@widtmann,

Which WEC7 image version you are using now? Please verify it using Updatetool ( Start → Programs → ColibriTools → UpdateTool, Version info button).
Second SD interface feature is implemented in 1.1 Beta 4 (http://developer.toradex.com/software/windows-embedded-compact/imx6-wec-software/release-details?view=all&issue=20559). Please use latest image release and let us know if you still face the problem.

3

I’m using Windows EC7 BSP 1.2 Beta, Build 6. I loaded it a week ago using the Toradex Easy Installer.

4

You may switch to release 1.2 (latest stable release and more recent than 1.2b6) or 1.3b2 (newest beta release), I would suggest 1.2 if you don’t need any of the new features of 1.3b2.
In any case, as Raja said, second SD slot is supported since 1.1b4 release.
In terms of GPIO configuration:

  • you don’t need to set the direction for the pins, when they are connected to SD controller this will be managed automatically by the SOC
  • For CD and WP pins (174-180) the alternate function is GPIO (5), but you have to configure those pins in a different way, described here:
    Windows Embedded Compact - iMX6 BSP Release
    (will move that to knowledge base to make it more visible, sorry for this)
5

@widmann
Could you please download and import the registry, save registry and reboot.
Let us know if that helps for you.

6

Thank you for the hints! The additional registry settings solved my problem. The additional SD card works perfectly now.

7

Thank you.