Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]

Groups > linux.debian.user > #195759

Re: UEFI/"BIOS" booting

From "Thomas Schmitt" <scdbackup@gmx.net>
Newsgroups linux.debian.user
Subject Re: UEFI/"BIOS" booting
Date 2018-05-15 09:00 +0200
Message-ID <vPC6d-1nZ-1@gated-at.bofh.it> (permalink)
References <vPtvY-4K0-3@gated-at.bofh.it>
Organization linux.* mail to news gateway

Show all headers | View raw

Hi,

i wrote:
> > And as said previously, BIOS does not expect any partitions.

Pascal Hambourg wrote:
> experience taught me that many BIOS implementations wrongly
> expect an MBR partition entry with the boot flag set in order to boot from
> the disk.

You are right (and those firmwares are wrong).

I had to introduce a special option in xorriso in order to cater for this:
  https://savannah.gnu.org/bugs/?46716
  http://lists.gnu.org/archive/html/bug-xorriso/2015-12/threads.html
with the final conclusion described in
  https://lists.gnu.org/archive/html/bug-grub/2016-03/msg00087.html

Summary:
- Boot flag on MBR partition of type 0xEE is bad on several EFI
  implementations.
- No MBR partition with boot flag is bad on some very few BIOS
  implementations.
- Compromise is to set the boot flag on a dummy partition of type 0x00.
  This is barely UEFI-compliant because the specs say that a partition of
  type 0x00 shall be regarded as non-existent.

Debian isohybrids for BIOS do not have this problem because MBR partition 1
has the boot flag set, anyway. But grub-mkrescue ISOs might be in need of
xorrisofs option
  --mbr-force-bootable
if the owner suffers from one of those rare BIOSes.
(It was decided that from the view of GRUB this is a workaround for a
 specs violation by the firmware. iSo --mbr-force-bootable is not applied
 by default.)


Have a nice day :)

Thomas

Back to linux.debian.user | Previous | Next — Previous in thread | Next in thread | Find similar | Unroll thread

Thread

USB Install Fails, Complains about CD-ROM Kent West <westk@acu.edu> - 2018-05-11 18:20 +0200
  Re: USB Install Fails, Complains about CD-ROM Robert Menes <viewtiful.icchan@gmail.com> - 2018-05-11 18:40 +0200
    Re: USB Install Fails, Complains about CD-ROM Rick Thomas <rbthomas@pobox.com> - 2018-05-12 01:10 +0200
      Re: USB Install Fails, Complains about CD-ROM Kenneth Parker <sea7kenp@gmail.com> - 2018-05-12 03:40 +0200
      Re: USB Install Fails, Complains about CD-ROM Pascal Hambourg <pascal@plouf.fr.eu.org> - 2018-05-12 19:40 +0200
  Re: USB Install Fails, Complains about CD-ROM "Thomas Schmitt" <scdbackup@gmx.net> - 2018-05-11 18:40 +0200
  Re: USB Install Fails, Complains about CD-ROM Curt <curty@free.fr> - 2018-05-11 19:10 +0200
    Re: USB Install Fails, Complains about CD-ROM Kent West <westk@acu.edu> - 2018-05-11 20:40 +0200
  Re: USB Install Fails, Complains about CD-ROM songbird <songbird@anthive.com> - 2018-05-11 19:50 +0200
    Re: USB Install Fails, Complains about CD-ROM Kent West <westk@acu.edu> - 2018-05-11 20:40 +0200
      Re: USB Install Fails, Complains about CD-ROM Kent West <westk@acu.edu> - 2018-05-11 21:30 +0200
      Re: USB Install Fails, Complains about CD-ROM Pascal Hambourg <pascal@plouf.fr.eu.org> - 2018-05-11 22:00 +0200
        Re: USB Install Fails, Complains about CD-ROM Kent West <westk@acu.edu> - 2018-05-11 22:20 +0200
          Re: USB Install Fails, Complains about CD-ROM "Thomas Schmitt" <scdbackup@gmx.net> - 2018-05-11 22:40 +0200
            Re: USB Install Fails, Complains about CD-ROM Kent West <westk@acu.edu> - 2018-05-11 23:00 +0200
              Re: USB Install Fails, Complains about CD-ROM "Thomas Schmitt" <scdbackup@gmx.net> - 2018-05-12 00:00 +0200
              Re: USB Install Fails, Complains about CD-ROM Brian <ad44@cityscape.co.uk> - 2018-05-12 12:30 +0200
            Re: USB Install Fails, Complains about CD-ROM Pascal Hambourg <pascal@plouf.fr.eu.org> - 2018-05-12 19:50 +0200
              Re: USB Install Fails, Complains about CD-ROM "Thomas Schmitt" <scdbackup@gmx.net> - 2018-05-12 21:40 +0200
                Re: USB Install Fails, Complains about CD-ROM Pascal Hambourg <pascal@plouf.fr.eu.org> - 2018-05-13 10:20 +0200
                Re: Block sizes in ISOs. was: USB Install Fails, Complains about CD-ROM "Thomas Schmitt" <scdbackup@gmx.net> - 2018-05-13 11:30 +0200
          UEFI/"BIOS" booting, was Re: USB Install Fails, Complains about  CD-ROM David Wright <deblis@lionunicorn.co.uk> - 2018-05-13 17:20 +0200
            Re: UEFI/"BIOS" booting, was Re: USB Install Fails, Complains about  CD-ROM Pascal Hambourg <pascal@plouf.fr.eu.org> - 2018-05-13 19:10 +0200
              Re: UEFI/"BIOS" booting, was Re: USB Install Fails, Complains about  CD-ROM David Wright <deblis@lionunicorn.co.uk> - 2018-05-14 02:10 +0200
                Re: UEFI/"BIOS" booting, was Re: USB Install Fails, Complains about  CD-ROM Pascal Hambourg <pascal@plouf.fr.eu.org> - 2018-05-14 23:40 +0200
                Re: UEFI/"BIOS" booting, was Re: USB Install Fails, Complains about  CD-ROM David Wright <deblis@lionunicorn.co.uk> - 2018-05-15 04:00 +0200
              Re: UEFI/"BIOS" booting, was Re: USB Install Fails, Complains about  CD-ROM songbird <songbird@anthive.com> - 2018-05-14 12:40 +0200
                Re: UEFI/"BIOS" booting, was Re: USB Install Fails, Complains about  CD-ROM Chris Ramsden <chris.ramsden@gmail.com> - 2018-05-14 14:40 +0200
                Re: UEFI/"BIOS" booting, was Re: USB Install Fails, Complains about  CD-ROM David Wright <deblis@lionunicorn.co.uk> - 2018-05-14 16:00 +0200
                Re: UEFI/"BIOS" booting, was Re: USB Install Fails, Complains about  CD-ROM Chris Ramsden <chris.ramsden@gmail.com> - 2018-05-14 17:00 +0200
                Re: UEFI/"BIOS" booting, was Re: USB Install Fails, Complains about  CD-ROM songbird <songbird@anthive.com> - 2018-05-15 02:50 +0200
            Re: UEFI/"BIOS" booting, was Re: USB Install Fails, Complains about CD-ROM Stefan Monnier <monnier@iro.umontreal.ca> - 2018-05-14 15:20 +0200
              Re: UEFI/"BIOS" booting, was Re: USB Install Fails, Complains about  CD-ROM David Wright <deblis@lionunicorn.co.uk> - 2018-05-14 16:40 +0200
                Re: UEFI/"BIOS" booting "Thomas Schmitt" <scdbackup@gmx.net> - 2018-05-14 18:00 +0200
                Re: UEFI/"BIOS" booting Pascal Hambourg <pascal@plouf.fr.eu.org> - 2018-05-14 23:50 +0200
                Re: UEFI/"BIOS" booting "Thomas Schmitt" <scdbackup@gmx.net> - 2018-05-15 09:00 +0200
                Re: UEFI/"BIOS" booting Pascal Hambourg <pascal@plouf.fr.eu.org> - 2018-05-16 00:20 +0200
                Re: UEFI/"BIOS" booting Pascal Hambourg <pascal@plouf.fr.eu.org> - 2018-05-16 23:50 +0200
                Re: UEFI/"BIOS" booting "Thomas Schmitt" <scdbackup@gmx.net> - 2018-05-17 13:00 +0200
                Re: UEFI/"BIOS" booting, was Re: USB Install Fails, Complains about CD-ROM Stefan Monnier <monnier@iro.umontreal.ca> - 2018-05-14 18:00 +0200
                Re: UEFI/"BIOS" booting, was Re: USB Install Fails, Complains about  CD-ROM David Wright <deblis@lionunicorn.co.uk> - 2018-05-15 03:30 +0200
                Re: UEFI/"BIOS" booting, was Re: USB Install Fails, Complains about  CD-ROM Pascal Hambourg <pascal@plouf.fr.eu.org> - 2018-05-16 00:40 +0200
                Re: UEFI/"BIOS" booting, was Re: USB Install Fails, Complains about  CD-ROM David Wright <deblis@lionunicorn.co.uk> - 2018-05-18 20:40 +0200
                Re: UEFI/"BIOS" booting Pascal Hambourg <pascal@plouf.fr.eu.org> - 2018-05-14 23:50 +0200
                Re: UEFI/"BIOS" booting David Wright <deblis@lionunicorn.co.uk> - 2018-05-15 03:40 +0200
                Re: UEFI/"BIOS" booting Pascal Hambourg <pascal@plouf.fr.eu.org> - 2018-05-16 00:40 +0200
                Re: UEFI/"BIOS" booting mess-mate <eric.m.c.declerck@gmail.com> - 2018-05-16 15:20 +0200
                Re: UEFI/"BIOS" booting David Wright <deblis@lionunicorn.co.uk> - 2018-05-18 20:50 +0200
  Re: USB Install Fails, Complains about CD-ROM Mike Kupfer <mkupfer@alum.berkeley.edu> - 2018-05-13 04:20 +0200
    Re: USB Install Fails, Complains about CD-ROM Curt <curty@free.fr> - 2018-05-13 10:30 +0200
      Re: USB Install Fails, Complains about CD-ROM "Thomas Schmitt" <scdbackup@gmx.net> - 2018-05-13 12:10 +0200
        Re: USB Install Fails, Complains about CD-ROM Curt <curty@free.fr> - 2018-05-13 14:10 +0200
          Re: USB Install Fails, Complains about CD-ROM "Thomas Schmitt" <scdbackup@gmx.net> - 2018-05-13 14:50 +0200
        Re: USB Install Fails, Complains about CD-ROM Mike Kupfer <mkupfer@alum.berkeley.edu> - 2018-05-13 19:00 +0200
          Re: USB Install Fails, Complains about CD-ROM "Thomas Schmitt" <scdbackup@gmx.net> - 2018-05-13 20:20 +0200
            Re: USB Install Fails, Complains about CD-ROM Mike Kupfer <mkupfer@alum.berkeley.edu> - 2018-05-14 00:40 +0200
              Re: USB Install Fails, Complains about CD-ROM "Thomas Schmitt" <scdbackup@gmx.net> - 2018-05-14 13:30 +0200
                Re: USB Install Fails, Complains about CD-ROM Mike Kupfer <mkupfer@alum.berkeley.edu> - 2018-05-14 16:50 +0200
                Re: USB Install Fails, Complains about CD-ROM "Thomas Schmitt" <scdbackup@gmx.net> - 2018-05-14 18:20 +0200
                Re: USB Install Fails, Complains about CD-ROM David Wright <deblis@lionunicorn.co.uk> - 2018-05-14 20:10 +0200
                Re: USB Install Fails, Complains about CD-ROM "Thomas Schmitt" <scdbackup@gmx.net> - 2018-05-14 22:10 +0200
                Re: USB Install Fails, Complains about CD-ROM Mike Kupfer <mkupfer@alum.berkeley.edu> - 2018-05-14 23:00 +0200
                Re: USB Install Fails, Complains about CD-ROM Mike Kupfer <mkupfer@alum.berkeley.edu> - 2018-05-15 01:20 +0200
                Re: USB Install Fails, Complains about CD-ROM "Thomas Schmitt" <scdbackup@gmx.net> - 2018-05-15 09:10 +0200
                Re: USB Install Fails, Complains about CD-ROM Mike Kupfer <mkupfer@alum.berkeley.edu> - 2018-05-17 23:40 +0200
                Re: USB Install Fails, Complains about CD-ROM "Thomas Schmitt" <scdbackup@gmx.net> - 2018-05-18 08:50 +0200
                Re: USB Install Fails, Complains about CD-ROM Mike Kupfer <mkupfer@alum.berkeley.edu> - 2018-05-15 01:10 +0200

csiph-web