Configuration save support #30
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Configure the build to place all code and data into RAM instead of flash by default. Then remove all the __time_critical_func decorators that were trying to do this but not fully covering all the important code. The default character ROM will remain in flash since it's only read once at startup. This will allow program flash to be modified without having to perform complex cross-core synchronization to stop flash accesses.
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Add the infrastructure for config saving & restoration and ensure that the configuration is read on power-up, falling back to default values if no configuration has ever been saved.
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This PR adds support for saving the device settings to the Pico's flash so that they are saved across power cycles. All the settings are saved:
The registers for saving & loading are documented in Usage.md.