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Microsoft opens sources ThreadX under MIT license
(www.theregister.com)
This is a most excellent place for technology news and articles.
I wonder what the implication would be for the pis?
Nothing. The Raspberry Pi Foundation is rather outspoken on abandoning the firmware and replacing it with regular in-kernel Linux drivers on newer hardware and has made progress on that front. Furthermore, the userpace of the firmware is all secret Broadcom code, Microsoft has only open-sourced the kernel of the Pi firmware. Older models will probably need the firmware forever.