How should do to adjust the firmware.config to enable CONFIG_INITIAL_PINS="xx_xx" permanently.
I have a V-Core 3.1 500 with BTT Manta M8P V1.1 and CB1 + BTT Relay V1.2 conectet to Pin PC3.
In order to permanently set the PIN to TRUE when booting, the setting in the firmware.config for CONFIG_INITIAL_PNIS is necessary.
How do I configure RatOs correctly in order not to lose this setting after an update?
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There's no way outside of forking, or manually maintaining a dirty working copy of the RatOS configuration. You'd have to modify the
firmware.config file in boards/btt-manta-m8p-11/.
To do that you can move it to ~/klipper/.configure, run make menuconfig make your modifications and copy it back to ~/printer_data/config/RatOS/boards/btt-manta-m8p-11/
Another thing you can do is not use the RatOS firmware configuration, so configure, compile and flash klipper to your board yourself and manually set the [mcu] serial path in your config, but you'd also be disabling automatic updates for your board that way.
But this way you can still use a clean RatOS installation.