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Replying to @josecastillo

first pass at SAM L21 support in the UF2 bootloader. Still need to clean up a few redundancies; it’s so similar to the L22 that a lot of the startup and init code was just copied and pasted from the Sensor Watch. then again, they are so dang the same. https://github.com/joeycastillo/uf2-samdx1/commit/b3b345b7f7df5a461d5189bc24e35d9d516c42b1

(original)