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Just about every Windows and Linux device vulnerable to new LogoFAIL firmware attack
(arstechnica.com)
This is a most excellent place for technology news and articles.
What's the market share of these? Are they even relevant?
Depends, definitely not in the consumer market. But coreboot is widely used in appliances. Have a look at the boards from pcengines.
No. He just wants to be over technical.