When I pull certain gpio pins down, other pins are briefly pulled down for 
just a moment. I'm thinking this is a configuration issue, but I can't 
figure out why (I'm fairly certain I've locked things down correctly in the 
cape manager).

I'm using P9_11, P9_12, P9_13, P9_15, P9_23, P9_24, P9_26, and P9_27 all 
set to output with pull  up. I've used the prebuilt cape configurations 
found here: 
https://github.com/nomel/beaglebone/blob/master/gpio-header/README.md and 
enabled the pull up state.

I also have SPI 0, HDMI, and eMMC installed in the cape manager.

Any thoughts on what could cause these other pins to briefly drop?

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