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I've got an issue with SDIO on STK1A32SC device, running Linux. Kernel writes out stuff like this:

i2c_designware 808622C1:06: punit semaphore timed out, resetting
i2c_designware 808622C1:06: PUNIT SEM: 2
i2c_designware 808622C1:06: couldn't acquire bus ownership
i2c_designware: probe of 808622C1:06 failed with error -110
intel_sst_acpi 808622A8:00: No matching machine driver found

I believe this means that SDIO on the device is entirely ineffective. What is the impact of missing SDIO, and is there any knowledge of a fix?

Edit: Never mind. Googling the issue finally tells me that this is likely only related to the external SD card support. I've not actually tried it. There's also a limited support now on 4.7 kernel.