Predictable pinouts on boot?

I noticed on the BBB the pins can be indeterminate on boot. One BBB outputs low on a pin and the other outputs high on a pin on boot even after setting them up in the device tree properly. After I execute my program the pins are set to the state I want them.

I’m controlling some external circuits so want fast stablize the pin signals. Are there any simple examples of doing this in UBoot to write to some registers to set the pin state immediately at boot?

If thy are not initialized by SW. then the default to a very deterministic mode as defined in the processor datasheet.

And yes. Some are high and some are low.