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How do you discover unused GPIO on the hardware abstraction layer?

In have a router on OpenWRT with an undocumented button I want to find. It is a MT7621 in a BGA so I can’t trace the hardware and rework is no go. It has the breed bootloader but it’s all in Chinese. Llama2 70B says to use github.com/rust-embedded/gpio-utils but I don’t see how that can really detect a change state on an...

Does anyone know a good guide for flashing a lenovo t440p with libreboot/coreboot?

Sorry if this isnt exactly perfect topic for this community. But i bought a t440p because of libreboot, and am waiting for it to come in the mail. Im very excited and have watched a few videos about it. I purely bought it because of the privacy that can be had

Can anyone find datasheets for these ICs ?

Just exploring about this tp-link XN020-G3v router. I’m mostly interested in connecting to the UART, won’t be tinkering with electronics of it, but out of curiosity I tried to search what these chips are. and I couldn’t find much about the big chip. Can anyone describe the 4 main chips on it ? Best would be datasheet, but...

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