Clover bootloader uefi install2/9/2024 ![]() ![]() The purpose of a bootloader is to load the kernel image into memory and to transfer the control to it. ![]() It embedded an UEFI OS Loader into its kernel (what a surprize!). It has taken the worst ever possible approach of doing UEFI. It’s a normal way, whereas BOOTXXX.EFI approach is for an “exceptional” case and the quote above shows - it is even “optional”!Ī good example of a not so reasonable one. This way, Haiku will appear in the Boot Manager menu and users can see/set/edit its load option as well (e.g. See section 12.3.1.3 “Directory Structure” (2.4.errata.b), they wrote that down clearly.ĭuring the installation, your installer creates the needed load option, asking UEFI Runtime Services - any UEFI compatible OS not only should preserve UEFI RTS, but also - may make use of them! This is one of the best examples of what it can be used for. It’s so easy to see from the specification, the right way to do stuff - you create your own folder under \efi\boot, in this example, let it be “haiku”, and put the OSL there, - voila! This is how it should work. ![]() For example if you will install another OS alongside and after Haiku, it might overwrite Haiku’s BOOTXXX.EFI file. This is already a sufficient reason to get rid off of this approach for the installation disk, since it makes running (installing) Haiku less successful. However, in the case where all the Boot# variables that are referenced in the BootOrder variable point to devices that are not present, the boot devices have timed out, the specific boot file did not exist, or there was no valid boot variable, default boot processing behavior may optionally occur. It is expected that on a non-removable media device, a complete FilePath can be used which includes sub directories and a file name for the boot target and the platform will boot using this FilePath according to normal system policy. Just read carefully section 3.4.1.2 (2.4.errata.b): It’s left to the implementation what set of media to try. When no valid load options worked out, nothing, only then it may try that. The default behavior must be invoked any time the BootOrder variable does not exist or only points to nonexistent boot options. However the boot options require a standard default behavior in the exceptional case that valid boot options are not present on a platform. The default state of globally-defined variables is firmware vendor specific. And for persistent, non-removable storage, where an OS could reside, this approach is the last resort of the UEFI Boot Manager to boot something (a so called “default boot behavior”):ģ.3 Boot Option Variables Default Boot Behavior It’s intended to be used normally only for removable devices (even here, it’s not the only option). When I see attempts to interact with UEFI on the OS development level (communities, hobbyists), I always see using this BOOT.efi is the last resort for the FW. It’s still a tiny portion of a rather smallish 256 GB hard disk, not to mention larger ones, that are more common nowadays.įinally the second, which especially makes me wonder. I’ve seen in many places, that setting ~100MB of the ESP size is quite good. Chapter 12 (2.4.errata.B) is a good source of hints on this. Knowing how bloated linux images are, you do realize that 32 MB might be problematic… There are other, saner reasons - ESP can hold a lot of data, resources from more than 1 vendor. Meaning that you need to put the whole linux image into an ESP and a bunch of other linux stuff. A good example of a not so reasonable one. And not all are reasonable, but still they are real. Then OSes installed after it, may use the same ESP. There are chances, that the ESP creation could be made by Haiku. But this ESP is not for Haiku only! And given the stage of Haiku, it’s well reasonable to expect many people using it alonside with other OSes, - a multiboot environment. When you format (in GPT) a raw disk, you create an ESP as part of Haiku installation. Note, there is a “multiple OS” mentioning. It is outside of the scope of this specification to attempt to coordinate the specification of size and location of an ESP that can be shared by multiple OS or Diagnostics installations, or to manage potential namespace collisions in directory naming in a single (central) ESP. The Uefi documentation frees itself of the responsibility to even advice “common” size, that’s true. It depends on many factors if that would be enough at all. ![]() Looking at this Haiku guide on Uefi booting, there appeared some questions.ĮSP (EFI System Partition) Size.You recommend 32 MB, telling it’s “more than enough”. Origination 55.ĭesignWidth 55.ĭesignHeight 55. ![]()
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