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--- xro:beaglebone [2015-12-09 00:29]
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+++ xro:beaglebone [2015-12-09 00:47]
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 In both cases, you still need a pin to connect the EN signal or power-relay for our peripherals,
-a PIN that you can trust to stay in a certain state during and after bootup.
+a PIN that you can trust to pull your pheripheral LOW even during bootup.
+A good choice for that are most pins that, per default, are muxed not to the GPIOchips but to internal devices like UART, SPI, I2C.
+The following is a list of measurement, which pins pull which direction (HIGH/LOW) during bootup.
+^PIN^ Test1 ^ Test2 ^ Test3 ^
+|P8_01 | DGND||
+|P8_02 | DGND||
+|P8_03 | 1 | 1|
+|P8_04 | 1 | 1|
+|P8_05 | 1 | 1|
+|P8_06 | 1 | 1|
+|P8_07 | 1 | 1|
+|P8_08 | 1 | 1|
+|P8_09 | 1 | 1|
+|P8_10 | 1 |1 |
+|P8_11 | 0 | 0|
+|P8_12 | 0 | 0|
+|P8_13 | 0 | 0|
+|P8_14 | 0 | 0|
+|P8_15 | 0 | 0|
+|P8_16 | 0 | 0|
+|P8_17 | 0 | 0|
+|P8_18 | 0 | 0|
+|P8_19 | 0 | 0|
+|P8_20 | 0 | 1|
+|P8_21 | high freq signal, 0||
+|P8_22 | float or high-freq, 1||
+|P8_23 | 1 | 1|
+|P8_24 | 1 | 1|
+|P8_25 | PWM signal 1||
+|P8_26 | 1 | 1|
+|P8_27 | 0 | 0|
+|P8_28 | 1 | 0|
+|P8_29 | 0 | 0|
+|P8_30 | 0 | 0|
+|P8_31 | 1 | 1|
+|P8_32 | 1 | 0|
+|P8_33 | 0 | 0 | 0|
+|P8_34 | 0 | 0 | 0|
+|P8_35 | 0|||
+|P8_36 | 0|||
+|P8_37 | 0|||
+|P8_38 | 0|||
+|P8_39 | 0|||
+|P8_40 | 0|||
+|P8_41 | 1|||
+|P8_42 | 1|||
+|P8_43 | 1|||
+|P8_44 | 1|||
+|P8_45 | 0|||
+|P8_46 | 0|||
+|P9_01 | DGND|||
+|P9_02 | DGND|||
+|P9_03 | 3V3 |||
+|P9_04 | 1 | 3V3 ||
+|P9_05 | VDD 5V ||
+|P9_06 | 0 | VDD 5V ???? ||
+|P9_07 | SYS 5V |||
+|P9_08 | 1 | SYS 5V |||
+|P9_09 | PWR_BUT|||
+|P9_10 | 1 | SYS_RESET|||
+|P9_11 | | |||
+|P9_12 | 1|||
+|P9_13 | 1|||
+|P9_14 | 0|||
+|P9_15 | pulsing 1 , every 480µs|||
+|P9_16 | 0 | 0|||
+|P9_17 | 0 | 0|||
+|P9_18 | 1 | 0|||
+|P9_19 | 1 | 1|||
+|P9_20 | 1 | 1|||
+|P9_21 | 1 | 1 | 1|
+|P9_22 | 1 | 1 | 1|
+|P9_23 | 0 | 0|||
+|P9_24 | 1 | 1|||
+|P9_25 | 0 | 0|||
+|P9_26 | 1 | 1|||
+|P9_27 | 0 | 0|||
+|P9_28 | 0 | 0|||
+|P9_29 | 0 | 0|||
+|P9_30 | 0 | 0|||
+|P9_31 | 0|||
+|P9_32 | 1 | VDD_ADC|||
+|P9_33 | 0 | AIN4|||
+|P9_34 | 0 | GND_ADC|||
+|P9_35 | 0 | AIN6|||
+|P9_36 | AIN5|||
+|P9_37 | 1 | AIN2|||
+|P9_38 | AIN3|||
+|P9_39 | 0 | AIN0|||
+|P9_40 | | AIN1|||
+|P9_41 | 0 | 0|||
+|P9_42 | 0 | 0|||
+|P9_43 | DGND|||
+|P9_44 | DGND|||
+|P9_45 | DGND|||
+|P9_46 | DGND|||

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