good call! @luz said in SPI SSD1306 Display boot problem: maybe it would make sense to mark the MOSI pin red in the datasheet too? Released v1.9 of Omega2S datasheet and v1.2 of Omega2 datasheet that includes SPI MOSI as a pin that's important for boot and must be floating. @luz said in SPI SSD1306 Display boot problem: And btw., the MT7688 datasheet links you have in the onion docs no longer work Thanks for the heads up! Updated the link to a copy that Onion hosts, so this should work indefinitely.

@JeffZhou Thanks a lot, for your response! I think that the 2nd point (VCC current) was the root cause of my issues: I used an AWG30 wire for all VCC lines which was too thin to carry the current. Regarding the UART <-> USB-Bridge the issue still persists, it requires a little fiddling: opening the serial connection after counting to three after plugging in. Then it worked booted in 100% correctly so far. Best Regards!

@Nagarjuna-Reddy This is the document I was referring to, so I think it is important to check that when you do a reboot that these pins are actually in the required state.

@William-Scott said in Omega2/2+ hangs while booting with hung WiFi: @tjoseph1 Good work! I'd like to re-emphasize for all newcomers that "power supply", as opposed to "THE power supply", is critical. Of course THE power supply must be able to satisfy peak current demand. The overall power supply also includes any cabling which may provide enough inductance that a power supply barely over the minimum required capability may be inadequate at the power pins of the Omega. It is only the available current at the Omega power pins that matter, not what an upstream subsystem can provide. --Bill Either way keep up the excellent quality writing.