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Here is something important you should understand: 95% of it was probably garbage. What I mostly want to talk about is bootloading, because that’s the bit of firmware that matters most to most people, and the bit news sites are always banging on about and wildly misunderstanding. Both BIOS and UEFI are types of firmware for computers. BIOS is not a generic term for all PC firmware, it is a particular type of PC firmware. If it’s an IBM PC compatible computer, it’s almost certainly either a BIOS or a UEFI firmware. We’ll talk about UEFI first, and then we’ll talk about Secure Boot as an ‘extension’ to UEFI, because that’s basically what it is. I am not going to tell you that reading it will be the most fun you’ve ever had, because it won’t. You can find it right here on the official UEFI site.If you think you know about UEFI, and you derived your knowledge anywhere other than the UEFI specifications, mjg59’s blog or one of a few other vaguely reliable locations/people – Rod Smith, or Peter Jones, or Chris Murphy, or the documentation of the relatively few OSes whose developers actually know what the hell they’re doing with UEFI – what you think you know is likely a toxic mix of misunderstandings, misconceptions, half-truths, propaganda and downright lies. BIOS-style firmware is (mostly) only ever found on IBM PC compatible computers. If you’re running Coreboot, congratulations, Mr./Ms. : UEFI was not invented by, is not controlled by, and has never been controlled by Microsoft. So is Red Hat, and so is Apple, and so is just about every major PC manufacturer, Intel (obviously), AMD, and a laundry list of other major and minor hardware, software and firmware companies and organizations. You have to check a couple of boxes, but you are not signing your soul away to Satan, or anything. As I write this, the current version of the spec is 2.4 Errata A, and that’s the version this post is written with regard to. BIOS is a standard – it works the way it worked on actual IBM PCs, in the 1980s. Now, to keep things simple, let’s consider two worlds.Completely and utterly different from how BIOS booting works.
If anyone tries this, please let me know how well it works.
You also cannot configure the boot process from outside of the firmware. Now let’s look at how booting works on a UEFI system.
Even if you don’t grasp the details of this post, grasp this: .
Kamil Paral kindly informs me I’m a chronic sufferer of Graphomania. IMPORTANT NOTE TO INDUSTRY FOLKS: This blog post is aimed at regular everyday folks; it’s intended to dispel a few common myths and help regular people understand UEFI a bit better.
It is not a low-level fully detailed and 100% technically accurate explanation, and I’m not a professional firmware engineer or anything like that.