Pinmuxing on the 5th generation Intel NUCs is done in the BIOS. This is only tested on bios 0024+ (MYBDWi5v.86A). By default the custom solution header is disabled, currently in Linux (as of 4.2). Both i2c buses are currently supported.
The NUCs supported are the NUC5i5MYBE & NUC5i3MYBE which also come as the NUC5i5MYHE and NUC5i3MYHE motherboards. It's possible that others expose the IO in a very similar way so could be supported, get in touch if you have one!
In the BIOS you are required to enable the following: Devices -> Onboard Devices - GPIO Lockdown Select I2c under GPIO for the 12/13 14/15 pins
I2C Depending on your system you may need to load i2c-dev
The mapping is the same as the DE3815tykhe.
| MRAA Number | Physical Pin | Function | Notes |
|---|---|---|---|
| 0 | 1 | 1.8V sby | |
| 1 | 2 | GND | |
| 2 | 3 | HDMI_CEC | |
| 3 | 4 | DMIC_CLK | |
| 4 | 5 | 3.3V sby | |
| 5 | 6 | DMIC_DATA | |
| 6 | 7 | Key (no pin) | |
| 7 | 8 | SMB_ALERT# | |
| 8 | 9 | 5V sby (2A) | |
| 9 | 10 | SCI_SMI_GPIO | |
| 10 | 11 | PWM[0] | |
| 11 | 12 | PWM[1] | |
| 12 | 13 | I2C0_CLK | /dev/i2c-0 SCL |
| 13 | 14 | I2C0_DATA | /dev/i2c-0 SDA |
| 14 | 15 | I2C1_CLK | /dev/i2c-1 SCL |
| 15 | 16 | I2C1_DATA | /dev/i2c-1-SDA |
| 16 | 17 | SMB_CLK | |
| 17 | 18 | SMB_DATA |