efivars

[Ruben Safir]

FWIW
ttps://uefi.org/sites/default/files/resources/UEFI_Spec_2_9_2021_03_18.pdf


On 9/23/21 6:28 AM, FMDF wrote:
> On Thu, 23 Sep 2021, 11:57 Ruben Safir, <ruben at mrbrklyn.com
> <mailto:ruben at mrbrklyn.com>> wrote:
> 
> 
>     Why does it need the bootloader to do any of that.  
> 
> 
> You still don't want to listen: the OS does not need to use bootloaders
> to do the things that Greg and I listed.
> 
> It needs UEFI runtime services; please don't be lazy and read Wikipedia
> article whose I provided the link. 
> 
> This is copy-pasted for your convenience:
> 
> "The Unified Extensible Firmware Interface (UEFI)[1]
> <https://en.m.wikipedia.org/wiki/Unified_Extensible_Firmware_Interface#cite_note-1>Â is
> a publicly available specification
> <https://en.m.wikipedia.org/wiki/Specification>Â that defines a
> software interface
> <https://en.m.wikipedia.org/wiki/Interface_%28computer_science%29>Â between
> an operating system
> <https://en.m.wikipedia.org/wiki/Operating_system>Â and
> platform firmware <https://en.m.wikipedia.org/wiki/Firmware>. UEFI
> replaces the legacy Basic Input/Output System (BIOS
> <https://en.m.wikipedia.org/wiki/BIOS>) firmware interface originally
> present in all IBM PC-compatible
> <https://en.m.wikipedia.org/wiki/IBM_PC_compatible>Â personal computers
> <https://en.m.wikipedia.org/wiki/Personal_computer>,[2]
> <https://en.m.wikipedia.org/wiki/Unified_Extensible_Firmware_Interface#cite_note-Intel2000-2>[3]
> <https://en.m.wikipedia.org/wiki/Unified_Extensible_Firmware_Interface#cite_note-ElReg1-3>Â with
> most UEFI firmware implementations providing support for legacy BIOS
> services[]".
> 
> If you spend few minutes there, you'll find also information there about
> the two different logical roles of UEFI:
> 
> "EFI defines two types of services: boot services and runtime
> services. Boot services are available only while the firmware owns the
> platform (i.e., before the ExitBootServices() call), and they include
> text and graphical consoles on various devices, and bus, block and file
> services. Runtime services are still accessible while the operating
> system is running; they include services such as date, time and NVRAM
> <https://en.m.wikipedia.org/wiki/Non-volatile_random-access_memory>Â access.".
> 
> Boot services are available only while the firmware owns the platform,
> so please stop saying "Why does it need the bootloader to do any of that[?]"
> 
> I told you that Linux can be booted without bootloaders, but that it
> still needs the UEFI runtime services. I also provided a link to the
> Kernel official  documentation to prove it.
> 
> Anyway, it really looks like you don't care to listen and that your main
> interest is standing by your own (unsubstantiated) positions.
> 
> Thanks,
> 
> Fabio
> 
> 
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> 


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