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Re: Trouble making bootable USB from ISO image

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Hi,

deloptes wrote:
> I was trying to setup UEFI bootable USB. All worked fine
> until grub told me something I do not recall exactly at the moment, but
> answers I found were pointing to the fact that you can not do grub
> update/install of UEFI if you are not booted into UEFI.

This is plausible together with Nicolas George's statement:
> > To edit UEFI variables, the computer need to have booted in UEFI mode.

But as said, the hack only tries to lure EFI into considering the block
range 2060 to 10365499 as (alternative) System Partition. It is a mere
partition table operation, no installation of a boot loader.

The loader and subsequent system are already prepared in the EFI partition
and the ISO. After EFI did its work of starting program \EFI\BOOT\BOOTX64.EFI
it depends on them whether they can deal with being on a not intended storage
medium. (The initrd of Debian ISOs has shell code which finds out the device
where the ISO is stored.)

The individual EFI firmware which shall act on the USB stick is actually
not determined when the ISO gets prepared. So there is no occasion or desire
to set non-volatile variables before the ISO gets booted.


Have a nice day :)

Thomas

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Thread

Re: Trouble making bootable USB from ISO image Greg Wooledge <wooledg@eeg.ccf.org> - 2019-05-03 19:00 +0200
  Re: Trouble making bootable USB from ISO image Paul Sutton <zleap@disroot.org> - 2019-05-03 19:30 +0200
    Re: Trouble making bootable USB from ISO image john doe <johndoe65534@mail.com> - 2019-05-03 19:40 +0200
  Re: Trouble making bootable USB from ISO image James Medeiros <james.medeiros@gmail.com> - 2019-05-03 19:30 +0200
  Re: Trouble making bootable USB from ISO image Mark Fletcher <mark27q1@gmail.com> - 2019-05-04 04:50 +0200
    Re: Trouble making bootable USB from ISO image "Russell L. Harris" <rlharris@oplink.net> - 2019-05-04 07:30 +0200
      RESOLVED: Trouble making bootable USB from ISO image Mark Fletcher <mark27q1@gmail.com> - 2019-05-05 05:30 +0200
    Re: Trouble making bootable USB from ISO image "Thomas Schmitt" <scdbackup@gmx.net> - 2019-05-04 08:40 +0200
      Re: Trouble making bootable USB from ISO image deloptes <deloptes@gmail.com> - 2019-05-04 09:20 +0200
        Re: Trouble making bootable USB from ISO image "Thomas Schmitt" <scdbackup@gmx.net> - 2019-05-04 09:30 +0200
          Re: Trouble making bootable USB from ISO image deloptes <deloptes@gmail.com> - 2019-05-04 11:30 +0200
            Re: Trouble making bootable USB from ISO image "Thomas Schmitt" <scdbackup@gmx.net> - 2019-05-04 11:50 +0200
            Re: Trouble making bootable USB from ISO image Pascal Hambourg <pascal@plouf.fr.eu.org> - 2019-05-04 14:40 +0200
        Re: Trouble making bootable USB from ISO image Nicolas George <george@nsup.org> - 2019-05-04 10:20 +0200
          Re: Trouble making bootable USB from ISO image deloptes <deloptes@gmail.com> - 2019-05-04 18:50 +0200
            Re: Trouble making bootable USB from ISO image Joe <joe@jretrading.com> - 2019-05-04 21:30 +0200
            Re: Trouble making bootable USB from ISO image Pascal Hambourg <pascal@plouf.fr.eu.org> - 2019-05-05 11:00 +0200
    Re: Trouble making bootable USB from ISO image Curt <curty@free.fr> - 2019-05-04 12:00 +0200
      Re: Trouble making bootable USB from ISO image Greg Wooledge <wooledg@eeg.ccf.org> - 2019-05-06 14:50 +0200
        Re: Trouble making bootable USB from ISO image Curt <curty@free.fr> - 2019-05-06 16:10 +0200

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