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ESPRESSOBin schematics and gpio clarifications

Elia Mazzuoli
in Marvell mvebu

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Hi,

I have bought a couple of ESPRESSOBin and I want to start some experiments. I have encounter some oddities on schematics and gpio description.

 

Schematics question:

On my two boars there is written that the circuit version is 5.1 but on the official wiki I have found only 4.0.1 schematics. Someone known were the updated schematics can be find?

I have found some different links:

Official wiki page Documents name report V4.0, schematics file report v4.0.1, date 21/01/2017

Official tech spec Documents name report V5.0, schematics file report v4.0.1, date 08/03/2017

 

Gpio question:

On gpio map there is some NC but assigned pin, I report a couple of this
9 | pwr_button | NC -> what this mean? Is not connected or is connected to power button?

11 | UART4_TDX | NC -> what this mean? Is that pin connected to the uart or not?

Check on schematics don't help in fact these pins don't have name (I report the J9 connector for convenience)

 

What do you think about?

espresso_gpio_p9.png

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