BeagleBone Black - Emmc Pins; Table 13. P8 Emmc Conflict Pins

REF: BBONEBLK_SRM
BeagleBone Black System
Reference Manual
Rev A5.2
Page 83 of 108
 When used for other functions, the HDMI frame cannot be used.
 There is no way to power off the framer as this would result in the framer being
powered through these pins which would not a be a good idea.
In order to use these pins, the SW will need to reconfigure them to whatever function you
need the pins to do. To keep power low, the HDMI framer should be put in a low power
mode via the SW using the I2C interface.
8.1.2 eMMC Pins
The BeagleBone Black uses 10 pins to connect to the processor that also connect to the
P8 expansion connector. These signals are listed below in Table 13.
Table 13. P8 eMMC Conflict Pins
PIN
PROC
NAME
MODE2
11
R12
GPIO1_13
mmc1_dat5
12
T12
GPIO1_12
Mmc1_dat4
13
T10
EHRPWM2B
mmc1_dat1
14
T11
GPIO0_26
mmc1_dat2
15
U13
GPIO1_15
mmc1_dat7
16
V13
GPIO1_14
mmc1_dat6
17
U12
GPIO0_27
mmc1_dat3
19
U10
EHRPWM2A
mmc1_dat0
20
V9
GPIO1_31
mmc1_cmd
21
U9
GPIO1_30
mmc1_clk
If using these pins, several things need to be kept in mind when doing so:
 On the eMMC device, these signals are inputs and outputs.
 The eMMC device will add a load onto these pins.
 When used for other functions, the eMMC cannot be used. This means you must
boot from the uSD slot.
 If using these pins, you need to put the eMMC into reset.
On power up, the eMMC is NOT reset. If you hold the Boot button down, this will force
a boot from the uSD. This is not convenient when a cape is plugged into the board. There
are two solutions to this issue:
1. Wipe the eMMC clean. This will cause the board to default to uSD boot. If you
want to use the eMMC later, it can be reprogrammed.
2. You can also tie LCD_DATA2 low on the cape during boot. This will be the same
as if you were holding the boot button. However, in order to prevent unforeseen