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Found this Saving for later!!! http://hipstercircuits.com/enable-serialuarttty-on-beaglebone-black/

Finding the numbers for muxing pins
I have yet to find a good explanation for the pin mux hex numbers. I discovered I had actually written it up myself in a previous post, but I’ll repeat it here for convenience.

In the above example you have the following:

0x070 0x26  /* P9_11 = GPIO0_30 = GPMC_WAIT0 , MODE6 */

The first number is the offset from the first pin (conf_gpmc_ad0). The second number is the mode and direction etc. Cameon has an explenation of the second number. Reprinted here for convenience:

• Bit 5: 1 – Input, 0 – Output
• Bit 4: 1 – Pull up, 0 – Pull down
• Bit 3: 1 – Pull disabled, 0 – Pull enabled
• Bit 2 \
• Bit 1   |- Mode
• Bit 0 /

The following is a list of the first numbers for all the pins that have been broken out on the Beaglebone.

So if you want to mux pin 6 from the P8 header to mode 7 (GPIO) and output, you say:

0x0C 0×07 /* P8_6 = GPIO1_3 -> Mode7, output. */

Here is a table of all the pins that are broken out with their corresponding numbers and names: