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<hitech95>
hi guys. I'm quite desperate. I'm missing to find a gpio on the original firmware it is captured by a userspace software but it is not exported. its an IRQ pin. any idea how to figure it out?
<hitech95>
I've already tried to switch all the free gpios to find the one but I've found none.
<hitech95>
And yes the pin must be connected to the soc. as the chip is read only when such pin goes hi. so unless there is magic involved the pin is somehow read by the userspace :D
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<hitech95>
I've found it finally. the mt7986 has both gpios that are 3.3 and 1.8? what an odd choice. I was expecting to find a gpio in low state but instead was hi as the pin was 1.8V.
<hitech95>
Had to pass the binary into ghidra to figure out the pin assigned (hardcoded)
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<ukleinek>
hitech95: I recently noticed that on a mt8365 based machine on an "rpi like header" a non-empty proper subset of the pins labeled "3V3" provide only 1.8V.
<hitech95>
ukleinek, I think they are the ones shared with emmc
<ukleinek>
hitech95: I didn't check, just rolled my eyes, had some phantasies of applying a clue stick to the responsible hardware engineer and switched to a 3V3 pin that provided 3.3V.
<hitech95>
I can understand I've spend 3 hours yesterday trying to figure out why I wasnt getting any gpio event on my logic analyzer... now we know why :D
<ukleinek>
hitech95: I think for me it was only 2 hours spend for nothing
<hitech95>
Do anyone have any info about BT/Zigbee coexist on such chips? I've seen that there are dedicated pins but no info other that use those. on hw reference manual for MT7986A. chapter 5.1.18.
<mrkiko>
Regarding IPq4xx switch to 6.12 - wondering if there are blockers at the moment, or if the problem is bandwidth review. Thanks!
<trix>
I wonder how useful writing a more "extreme" sysupgrade, possibly target-specific, would be. by that i'm thinking about multiple partitions (A/B), overwriting the other one, then either flipping a switch or overwriting the bootloader last (so that the likelyhood of brick is narrowed down). assuming size isn't a concern