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odroid-go-multi-firmware
Odroid-go-multi-firmware is an improvement of the official ODROID-GO firmware. It allows you to keep multiple applications installed in the flash and switch instantly between them.
Link to the code I meant: https://github.com/ducalex/odroid-go-multi-firmware/blob/master/main/main.c
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InfluxDB
InfluxDB – Built for High-Performance Time Series Workloads. InfluxDB 3 OSS is now GA. Transform, enrich, and act on time series data directly in the database. Automate critical tasks and eliminate the need to move data externally. Download now.
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https://github.com/marchingband/wvr/blob/main/src/boot.cpp This uses eMMC which is very similar to SD.
NOTE:
The number of mentions on this list indicates mentions on common posts plus user suggested alternatives.
Hence, a higher number means a more popular project.