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Qualcomm goes where Apple won't, readies official Linux support for Snapdragon X Elite | Tom's Hardware
(www.tomshardware.com)
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Linux is a family of open source Unix-like operating systems based on the Linux kernel, an operating system kernel first released on September 17, 1991 by Linus Torvalds. Linux is typically packaged in a Linux distribution (or distro for short).
Distributions include the Linux kernel and supporting system software and libraries, many of which are provided by the GNU Project. Many Linux distributions use the word "Linux" in their name, but the Free Software Foundation uses the name GNU/Linux to emphasize the importance of GNU software, causing some controversy.
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It needs proprietary software to boot
Most x86 EFIs are, so the comparison is not really fair.
That is only sort of true. You don't need proprietary software on a live USB to boot x86. That's not the case with the Raspberry Pi as it boots from its GPU