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Re: UEFI question

From crankypuss <invalid@invalid.invalid>
Newsgroups alt.os.linux
Subject Re: UEFI question
Date 2015-12-30 06:03 -0700
Organization A noiseless patient Spider
Message-ID <n60khc$rip$1@dont-email.me> (permalink)
References <n60hg5$h8a$1@dont-email.me> <n60j2j$2chn$1@saria.nerim.net>

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Pascal Hambourg wrote:

> Hello,
> 
> crankypuss a écrit :
>> from,
>>    http://adam8157.info/blog/2015/04/hybrid-bootable-usb-stick-for-uefi-and-legacy-bios
>> 
>> "Legacy BIOS needs bootloaders to be installed into MBR
> 
> Yes.
> 
>> and the reserved space after it.
> 
> No. Anywhere else is fine too.
> 
>> UEFI only needs bootloaders in ESP(EFI System Partition).
> 
> Yes.
> 
>> There is no resource competition between legacy BIOS and UEFI
>> requirements."
> 
> Yes, in theory. But practice may be different due to BIOS and UEFI
> implementations.

Thanks Pascal.

I recognize that there are broken firmware implementations, that's how 
you learn which makers to avoid. <g>

From the theoretical correctness of those statements, I tend to conclude 
that a legacy BIOS system will remain unaffected by the presence/absence 
of an ESP, it's just some other partition not to be concerned with.  
However, the ESP only appears in GPT tables (doesnt' it?), so there's a 
question of whether (all non-broken) legacy BIOS systems will boot from 
a GPT-formatted device (and I've heard anecdotal comments that lead me 
to believe they will, but I haven't yet validated that myself). 

It also leads me to conclude that (non-broken) UEFI firmware recognizes 
the ESP, but it's unclear whether it navigates the filesystem within the 
ESP or simply recognizes it by some set of flags and runs a first-stage 
loader from the recognized partition?

-- 
http://totally-portable-software.blogspot.com
  [Sun Nov 22: "Total Portability is not binary"]

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Thread

UEFI question crankypuss <invalid@invalid.invalid> - 2015-12-30 05:11 -0700
  Re: UEFI question Pascal Hambourg <boite-a-spam@plouf.fr.eu.org> - 2015-12-30 13:35 +0100
    Re: UEFI question crankypuss <invalid@invalid.invalid> - 2015-12-30 06:03 -0700
      Re: UEFI question Bit Twister <BitTwister@mouse-potato.com> - 2015-12-30 13:48 +0000
        Re: UEFI question crankypuss <invalid@invalid.invalid> - 2015-12-30 14:10 -0700
          Re: UEFI question "David W. Hodgins" <dwhodgins@nomail.afraid.org> - 2015-12-30 16:26 -0500
            Re: UEFI question Pascal Hambourg <boite-a-spam@plouf.fr.eu.org> - 2015-12-31 10:21 +0100
              Re: UEFI question "David W. Hodgins" <dwhodgins@nomail.afraid.org> - 2015-12-31 08:50 -0500
                Re: UEFI question Pascal Hambourg <boite-a-spam@plouf.fr.eu.org> - 2015-12-31 16:19 +0100
                Re: UEFI question crankypuss <invalid@invalid.invalid> - 2015-12-31 11:51 -0700
                Re: UEFI question Bit Twister <BitTwister@mouse-potato.com> - 2015-12-31 19:34 +0000
                Re: UEFI question Pascal Hambourg <boite-a-spam@plouf.fr.eu.org> - 2015-12-31 21:52 +0100
                Re: UEFI question "David W. Hodgins" <dwhodgins@nomail.afraid.org> - 2016-01-01 18:58 -0500
                Re: UEFI question Pascal Hambourg <boite-a-spam@plouf.fr.eu.org> - 2016-01-02 02:19 +0100
                Re: UEFI question blind Pete <0123peter@gmail.com> - 2016-01-03 16:30 +1100
                Re: UEFI question Pascal Hambourg <boite-a-spam@plouf.fr.eu.org> - 2016-01-03 11:12 +0100
                Re: UEFI question Eef Hartman <E.J.M.Hartman@gmail.com> - 2016-01-03 12:44 +0000
                Re: UEFI question Pascal Hambourg <boite-a-spam@plouf.fr.eu.org> - 2016-01-03 15:16 +0100
                Re: UEFI question blind Pete <0123peter@gmail.com> - 2016-01-03 23:12 +1100
                Re: UEFI question Pascal Hambourg <boite-a-spam@plouf.fr.eu.org> - 2016-01-03 15:22 +0100
                Re: UEFI question crankypuss <invalid@invalid.invalid> - 2016-01-02 01:53 -0700
                Re: UEFI question Pascal Hambourg <boite-a-spam@plouf.fr.eu.org> - 2016-01-02 12:08 +0100
                Re: UEFI question crankypuss <invalid@invalid.invalid> - 2016-01-02 10:47 -0700
            Re: UEFI question crankypuss <invalid@invalid.invalid> - 2015-12-31 02:37 -0700
          Re: UEFI question Bit Twister <BitTwister@mouse-potato.com> - 2015-12-30 22:18 +0000
      Re: UEFI question Pascal Hambourg <boite-a-spam@plouf.fr.eu.org> - 2015-12-31 10:16 +0100
        Re: UEFI question crankypuss <invalid@invalid.invalid> - 2015-12-31 02:46 -0700
      Re: UEFI question blind Pete <0123peter@gmail.com> - 2016-01-01 21:20 +1100
        Re: UEFI question crankypuss <invalid@invalid.invalid> - 2016-01-01 05:08 -0700
          Re: UEFI question Pascal Hambourg <boite-a-spam@plouf.fr.eu.org> - 2016-01-01 21:51 +0100
            Re: UEFI question crankypuss <invalid@invalid.invalid> - 2016-01-01 15:17 -0700
              Re: UEFI question Bit Twister <BitTwister@mouse-potato.com> - 2016-01-01 23:06 +0000
                Re: UEFI question crankypuss <invalid@invalid.invalid> - 2016-01-02 02:16 -0700
                Re: UEFI question Bit Twister <BitTwister@mouse-potato.com> - 2016-01-02 10:04 +0000
                Re: UEFI question crankypuss <invalid@invalid.invalid> - 2016-01-02 03:39 -0700
                Re: UEFI question blind Pete <0123peter@gmail.com> - 2016-01-03 15:20 +1100
          Re: UEFI question blind Pete <0123peter@gmail.com> - 2016-01-03 15:14 +1100

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