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Depthboot: Your Chromebook, your way. No modifying firmware.
(eupnea-linux.github.io)
This is a most excellent place for technology news and articles.
Since that page has zero useful information on it, I found this elsewhere:
It appears to be a way to run Linux direct on device (non-ARM) instead of emulated, though I can't be 100% sure since it doesn't actually say that anywhere obvious.