From: "Thomas Schmitt" <scdbackup@gmx.net>
To: grub-devel@gnu.org
Subject: Re: grub-mkrescue: Problem with MBR partition table at start of EFI partition
Date: Sat, 11 May 2019 19:31:23 +0200 [thread overview]
Message-ID: <205716785714791002879@scdbackup.webframe.org> (raw)
In-Reply-To: <20190511142010.wwddbacurjzi542i@pelzflorian.localdomain>
Hi,
Florian Pelz wrote:
> Shall I continue testing?
I'm into ISO images. But it might be interesting to see what Microsoft
deems to be bootable and is willing to promote by its weight.
> I do not know how to verify on Windows if the boot used UEFI.
You could zeroize the x86 machine code in the MBR:
dd if=/dev/zero bs=1 count=446 of=/dev/sdb
Then BIOS/CSM legacy mode should not have anything to start with.
(It would be interesting to know whether there is useful machine code
in the MBR at all.)
Similarly you could rename the efi/boot directory in order to hide the
EFI start-up programs and thus to prevent EFI booting.
Have a nice day :)
Thomas
next prev parent reply other threads:[~2019-05-11 17:35 UTC|newest]
Thread overview: 38+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-04-21 13:43 grub-mkrescue: Problem with MBR partition table at start of EFI partition Thomas Schmitt
2019-04-21 17:30 ` Vladimir 'phcoder' Serbinenko
2019-04-21 19:29 ` Thomas Schmitt
2019-04-24 20:32 ` Daniel Kiper
2019-04-25 6:00 ` pelzflorian (Florian Pelz)
2019-04-25 8:18 ` Thomas Schmitt
2019-04-25 9:36 ` pelzflorian (Florian Pelz)
2019-04-30 23:42 ` Vladimir 'phcoder' Serbinenko
2019-05-01 7:33 ` Thomas Schmitt
2019-05-09 20:21 ` Chris Murphy
2019-05-09 21:21 ` Thomas Schmitt
2019-05-10 6:21 ` Thomas Schmitt
2019-05-10 7:09 ` Thomas Schmitt
2019-05-10 12:12 ` pelzflorian (Florian Pelz)
2019-05-10 13:46 ` Thomas Schmitt
2019-05-10 16:12 ` pelzflorian (Florian Pelz)
2019-05-10 16:27 ` Thomas Schmitt
2019-05-11 10:51 ` pelzflorian (Florian Pelz)
2019-05-11 12:05 ` Thomas Schmitt
2019-05-11 14:20 ` pelzflorian (Florian Pelz)
2019-05-11 17:31 ` Thomas Schmitt [this message]
2019-05-11 19:13 ` pelzflorian (Florian Pelz)
2019-05-11 20:39 ` Thomas Schmitt
2019-05-13 21:04 ` Daniel Kiper
2019-05-13 21:55 ` Thomas Schmitt
2019-05-14 6:04 ` Thomas Schmitt
2019-05-15 9:45 ` Daniel Kiper
2019-05-15 10:57 ` Thomas Schmitt
2019-05-16 10:29 ` Daniel Kiper
2019-05-16 12:18 ` Thomas Schmitt
2019-05-20 12:35 ` Daniel Kiper
2019-05-20 14:37 ` Thomas Schmitt
2019-06-15 0:15 ` Chris Murphy
2019-06-15 6:01 ` pelzflorian (Florian Pelz)
2019-05-09 19:51 ` Chris Murphy
2019-05-09 21:06 ` Thomas Schmitt
-- strict thread matches above, loose matches on Subject: below --
2019-05-11 18:15 Michael Schierl
2019-05-11 19:42 ` Thomas Schmitt
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