Today i finally booked myself to test oled screen.

Initially i soldered out headers for both SPI and I2C screens to test them both. 

First discovery - I've soldered out SPI pins wrong, MISO and MOSI are switched places, but what is more important, with oled display connected to SPI bus it won't boot. Kind of a bummer. 

According to docs GPIO7 and GPIO8 being SPI CLK and SPI MOSI must be left floating at boot, and clearly that's not the case with screen connected. Of course I'd be able to make it work with buffer IC between omega and screen, but since i was ready to have it only for free, I'm dropping SPI idea alltogether,

As for I2C screen - it works perfectly normal. Once again in the docs there is a great info how to jump start it and even nice command line tool is bundled in.

So there it is, i'm keeping I2C version of the screen for next revision and SPI has to go.