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merge rusEFI wiki

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Custom-Firmware.md
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@ -65,3 +65,10 @@ jobs:
If you want to have several different boards in the same repo, you should put them in different sub-directories, so they can have their own board.mk, board_configuration.cpp, and prepend.txt.
There is also a `rusefi-dir` option you can use if you want to put your rusefi submodule somewhere other than `ext/rusefi`. You will also need to change the path in the `uses:` field.
## FAQ
### Q: I get "exti index already used" error?
A: stm32 has a limitation: you can only have 16 digital inputs. Also each input has to be on a pin with unique numeric part: for example, you can have digital input on pins PA1 PB2 PC3 but you cannot have PA1 and PB1 since those are both "something-1" pins.