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https://olimex.wordpress.com/2020/07/09/lime2-shield-adds-can-second-sd-card-two-uext-connectors-audio-in-and-out-breadboard-friendly-gpios-to-a20-olinuxino-lime2-open-source-hardware-linux-computer/
LIME2-SHIELD adds CAN, second SD-card, two UEXT connectors, Audio IN and OUT, breadboard friendly GPIOs to A20-OLinuXino-LIME2 Open Source Hardware Linux computer