Use DIP switch and remove R1 DNP pads in future board revs

[quorten]

Thinking through it more, it's probably better to just use a DIP switch and remove the R1 pad from future board revisions. Removable jumpers feel clumsy. The cost savings of not using a switch don't seem to make sense for us, and a rugged write-enable connection is probably not important for our board. The motivation of the Pi HAT template including both may have been to simply make it easy for downstream designers to choose one way or the other, but not both.

A future board revision can incorporate these changes.

See also: Issue #47.

[garlick]

What would be the downside to permanently enabling EEPROM writes? This isn't really a plug and play project, so it seems like a low magnitude foot-gun. Unless maybe a spurious write is an actual issue and leaving it writable would reduce its reliability.

[quorten]

Good point, I can't think of anything that could really much go wrong with spurious writes given that I2C0 is generally considered to be reserved.