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BeagleBone Black P8 Header

The GPIO side of the BeagleBone Black. Most of it is already spoken for by the on-board eMMC and HDMI, which is the first thing to work out before wiring a cape.

Cheat sheet (SVG)

Logic level: 3.3 V
Package: 2x23 2.54 mm (P8)

1.Pinout diagram

Highlight a signalhover to preview, click to keep

Odd pins

BBB P8

Even pins

Pin detail

Hover a pin for its mappings and gotchas. Click to keep it here.

Logic level: 3.3 V
Package: 2x23 2.54 mm (P8)

Fig. 1. BeagleBone Black P8 Header, 2x23 2.54 mm (P8). Hover or tap a signal to light up every pin that carries it.

2.Watch out

Pins 27 to 46 drive the on-board HDMI framer. They are yours only after disabling HDMI in the device tree, and doing that costs you video output.
Pins 3 to 6 and 20 to 25 go to the on-board eMMC. Taking them means booting from microSD instead.
Between HDMI and eMMC, a stock board leaves roughly ten pins on P8 genuinely free. Plan the cape around that, not around the 46 holes.
Signal names here are the power-on defaults. Nearly every pin muxes to something else, and several reach the PRU, the real reason to pick this board over a Pi.
GPIO are 3.3 V and not 5 V tolerant, at 4 to 6 mA per pin.
The P8 and P9 headers are keyed the same and sit the same distance apart as on the original BeagleBone, so older capes still fit.
The other side of this board is the P9 header, documented separately: gwark.dev/openlabbench/pinouts/beaglebone-black-p9

3.Full pin reference

Every pin, alias and mapping. This is the table that prints.

Table 1. Pin assignments.

Complete pin reference for BeagleBone Black P8 Header
Pin	Name	Also called	Functions	Notes
1	GND	-	Ground
2	GND	-	Ground
3	GPIO1_6	R9	GPIO1_6	Wired to the on-board eMMC. Using it breaks eMMC boot.
4	GPIO1_7	T9	GPIO1_7	Wired to the on-board eMMC. Using it breaks eMMC boot.
5	GPIO1_2	R8	GPIO1_2	Wired to the on-board eMMC. Using it breaks eMMC boot.
6	GPIO1_3	T8	GPIO1_3	Wired to the on-board eMMC. Using it breaks eMMC boot.
7	TIMER4PWM	R7	TIMER4
8	TIMER7PWM	T7	TIMER7
9	TIMER5PWM	T6	TIMER5
10	TIMER6PWM	U6	TIMER6
11	GPIO1_13	R12	GPIO1_13
12	GPIO1_12	T12	GPIO1_12
13	EHRPWM2BPWM	T10	EHRPWM2B
14	GPIO0_26	T11	GPIO0_26
15	GPIO1_15	U13	GPIO1_15
16	GPIO1_14	V13	GPIO1_14
17	GPIO0_27	U12	GPIO0_27
18	GPIO2_1	V12	GPIO2_1
19	EHRPWM2APWM	U10	EHRPWM2A
20	GPIO1_31	V9	GPIO1_31	Wired to the on-board eMMC. Using it breaks eMMC boot.
21	GPIO1_30	U9	GPIO1_30	Wired to the on-board eMMC. Using it breaks eMMC boot.
22	GPIO1_5	V8	GPIO1_5	Wired to the on-board eMMC. Using it breaks eMMC boot.
23	GPIO1_4	U8	GPIO1_4	Wired to the on-board eMMC. Using it breaks eMMC boot.
24	GPIO1_1	V7	GPIO1_1	Wired to the on-board eMMC. Using it breaks eMMC boot.
25	GPIO1_0	U7	GPIO1_0	Wired to the on-board eMMC. Using it breaks eMMC boot.
26	GPIO1_29	V6	GPIO1_29
27	GPIO2_22	U5	GPIO2_22	Wired to the on-board HDMI framer. Free only once HDMI is disabled in the device tree.
28	GPIO2_24	V5	GPIO2_24	Wired to the on-board HDMI framer. Free only once HDMI is disabled in the device tree.
29	GPIO2_23	R5	GPIO2_23	Wired to the on-board HDMI framer. Free only once HDMI is disabled in the device tree.
30	GPIO2_25	R6	GPIO2_25	Wired to the on-board HDMI framer. Free only once HDMI is disabled in the device tree.
31	UART5_CTSNUART	V4	UART5_CTSN	Wired to the on-board HDMI framer. Free only once HDMI is disabled in the device tree.
32	UART5_RTSNUART	T5	UART5_RTSN	Wired to the on-board HDMI framer. Free only once HDMI is disabled in the device tree.
33	UART4_RTSNUART	V3	UART4_RTSN	Wired to the on-board HDMI framer. Free only once HDMI is disabled in the device tree.
34	UART3_RTSNUART	U4	UART3_RTSN	Wired to the on-board HDMI framer. Free only once HDMI is disabled in the device tree.
35	UART4_CTSNUART	V2	UART4_CTSN	Wired to the on-board HDMI framer. Free only once HDMI is disabled in the device tree.
36	UART3_CTSNUART	U3	UART3_CTSN	Wired to the on-board HDMI framer. Free only once HDMI is disabled in the device tree.
37	UART5_TXDUART	U1	UART5_TXD	Wired to the on-board HDMI framer. Free only once HDMI is disabled in the device tree.
38	UART5_RXDUART	U2	UART5_RXD	Wired to the on-board HDMI framer. Free only once HDMI is disabled in the device tree.
39	GPIO2_12	T3	GPIO2_12	Wired to the on-board HDMI framer. Free only once HDMI is disabled in the device tree.
40	GPIO2_13	T4	GPIO2_13	Wired to the on-board HDMI framer. Free only once HDMI is disabled in the device tree.
41	GPIO2_10	T1	GPIO2_10	Wired to the on-board HDMI framer. Free only once HDMI is disabled in the device tree.
42	GPIO2_11	T2	GPIO2_11	Wired to the on-board HDMI framer. Free only once HDMI is disabled in the device tree.
43	GPIO2_8	R3	GPIO2_8	Wired to the on-board HDMI framer. Free only once HDMI is disabled in the device tree.
44	GPIO2_9	R4	GPIO2_9	Wired to the on-board HDMI framer. Free only once HDMI is disabled in the device tree.
45	GPIO2_6	R1	GPIO2_6	Wired to the on-board HDMI framer. Free only once HDMI is disabled in the device tree.
46	GPIO2_7	R2	GPIO2_7	Wired to the on-board HDMI framer. Free only once HDMI is disabled in the device tree.

Primary sources

Found a wrong pin? The whole board is one file, data/boards/beaglebone-black-p8.json.

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