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

Interface notes

I2C Depending on your system you may need to load i2c-dev

Custom Solutions Header mapping

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