NVMe and SD card boot test with latest bootloader. Orange Pi 5 - YouTube
1.8.4 SD Card Bootloader Configurations
MPLAB® Harmony Bootloader Library
Amazon.com: SparkFun OpenLog Open-source data logger works over a simple serial connection Supports microSD FAT16/32 cards up to 32GB Configurable baud rates up to 115200bps Preprogrammed ATmega328 and bootloader : Electronics