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From: "Thomas Schmitt" <scdbackup@gmx.net>
To: bug-xorriso@gnu.org
Cc: guix-devel@gnu.org
Subject: Re: ISO installer image: GPT versus MBR partitions
Date: Sat, 20 Apr 2019 13:16:14 +0200	[thread overview]
Message-ID: <32128673174594726028@scdbackup.webframe.org> (raw)
In-Reply-To: <28973673174197768455@scdbackup.webframe.org>

Hi,

i now look at the FAT filesystem images of Debian Live 9 and Guix 0.16.0:

Guix:

- There is an MBR partition table in the image file:
    Device            Boot Start   End Sectors  Size Id Type
    /mnt/iso/efi.img1 *        0  2879    2880  1.4M  1 FAT12

- Program "file" says:

  DOS/MBR boot sector, code offset 0x3c+2,
  OEM-ID "MTOO4021",
  root entries 224, sectors 2880 (volumes <=32 MB) ,
  sectors/FAT 9, sectors/track 18,
  serial number 0x336648a7, unlabeled,
  FAT (12 bit), followed by FAT

Debian:

- No partition table in image.

- Program "file" says:
  DOS/MBR boot sector, code offset 0x3c+2,
  OEM-ID "mkfs.fat",
  sectors/cluster 4, root entries 512, sectors 832 (volumes <=32 MB) ,
  Media descriptor 0xf8,
  sectors/FAT 1, sectors/track 32, heads 64,
  serial number 0x64c6c435, unlabeled, FAT (12 bit)

---------------------------------------------------------------------

My favorite suspect would be the partition table in Guix /efi.img.

To kill table entry 1 after having put the Guix EFI image back into
partition 2 of the USB stick:

   dd if=/dev/zero bs=1 count=16 seek=446 of=/dev/sdc1

---------------------------------------------------------------------

If this does not help, then create a new empty FAT filesystem image,
mount it, and copy the tree from the mounted Guix /efi.img into it.
The new filesystem should have between 200 KiB and 1.4 MiB.
(The Guix image of 1.4 MiB still has 90 % of its capacity free.)

Then put the new filesystem into /dev/sdc2 and see what happens.

---------------------------------------------------------------------

If this does not help, then copy again the Debian efi.img into partition 2,
mount it, and replace the file bootx64.efi by the one of the mounted
Guix efi.img.

---------------------------------------------------------------------

Have a nice day :)

Thomas

  reply	other threads:[~2019-04-20 11:15 UTC|newest]

Thread overview: 78+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <20190415165451.dpzngealeisbibc7@pelzflorian.localdomain>
     [not found] ` <1582867226375139246@scdbackup.webframe.org>
2019-04-16  9:57   ` bug#33639: ISO installer image is broken on i686 Gábor Boskovits
2019-04-16 13:40     ` ISO installer image: GPT versus MBR partitions (was bug#33639) Thomas Schmitt
2019-04-16 16:32       ` pelzflorian (Florian Pelz)
2019-04-16 17:57         ` ISO installer image: GPT versus MBR partitions Thomas Schmitt
2019-04-16 19:55           ` pelzflorian (Florian Pelz)
2019-04-16 20:31             ` pelzflorian (Florian Pelz)
2019-04-16 21:15               ` Thomas Schmitt
2019-04-17  8:59                 ` pelzflorian (Florian Pelz)
2019-04-17 10:23                   ` Thomas Schmitt
2019-04-17 10:30                     ` pelzflorian (Florian Pelz)
2019-04-17 15:51                     ` Thomas Schmitt
2019-04-17 22:35                       ` pelzflorian (Florian Pelz)
2019-04-18  6:32                         ` Thomas Schmitt
2019-04-18  7:00                           ` Thomas Schmitt
2019-04-18  7:07                             ` pelzflorian (Florian Pelz)
2019-04-18  8:13                               ` Thomas Schmitt
2019-04-18 12:19                                 ` pelzflorian (Florian Pelz)
2019-04-18 13:50                                   ` Thomas Schmitt
2019-04-18 21:28                                     ` Thomas Schmitt
2019-04-19  7:29                                       ` pelzflorian (Florian Pelz)
2019-04-19  8:03                                     ` pelzflorian (Florian Pelz)
2019-04-19  9:01                                       ` Thomas Schmitt
2019-04-19  9:39                                         ` pelzflorian (Florian Pelz)
2019-04-19 10:58                                           ` Thomas Schmitt
2019-04-19 14:57                                             ` pelzflorian (Florian Pelz)
2019-04-19 11:30                                         ` pelzflorian (Florian Pelz)
2019-04-19 18:33                                           ` pelzflorian (Florian Pelz)
2019-04-19 19:23                                             ` Thomas Schmitt
2019-04-20 10:26                                               ` pelzflorian (Florian Pelz)
2019-04-20 10:50                                                 ` Thomas Schmitt
2019-04-20 11:16                                                   ` Thomas Schmitt [this message]
2019-04-20 11:29                                                     ` Thomas Schmitt
2019-04-20 14:23                                                       ` Thomas Schmitt
2019-04-20 14:54                                                         ` pelzflorian (Florian Pelz)
2019-04-20 15:17                                                           ` pelzflorian (Florian Pelz)
2019-04-20 15:33                                                           ` pelzflorian (Florian Pelz)
2019-04-20 16:32                                                             ` Thomas Schmitt
2019-04-21  7:58                                                               ` pelzflorian (Florian Pelz)
2019-04-21  9:35                                                                 ` Thomas Schmitt
2019-04-21 11:10                                                                   ` pelzflorian (Florian Pelz)
2019-04-21 11:16                                                                 ` Thomas Schmitt
2019-04-21 11:56                                                                   ` pelzflorian (Florian Pelz)
2019-04-21 12:27                                                                     ` Thomas Schmitt
2019-04-21 14:11                                                                       ` pelzflorian (Florian Pelz)
2019-04-21 14:36                                                                         ` Thomas Schmitt
2019-04-22 13:11                                                                           ` Thomas Schmitt
2019-04-23 16:40                                                                       ` pelzflorian (Florian Pelz)
2019-04-23 17:23                                                                         ` Thomas Schmitt
2019-04-17 12:24               ` Ludovic Courtès
2019-04-17 13:42                 ` pelzflorian (Florian Pelz)
2019-04-23 18:14       ` Thomas Schmitt
2019-04-23 19:50         ` pelzflorian (Florian Pelz)
2019-04-23 20:18           ` Thomas Schmitt
2019-04-23 21:43             ` pelzflorian (Florian Pelz)
2019-04-24  6:56               ` Thomas Schmitt
2019-04-24  9:13                 ` pelzflorian (Florian Pelz)
2019-04-24 10:34                   ` Thomas Schmitt
2019-04-24 22:13                     ` Danny Milosavljevic
2019-04-25  7:07                       ` Thomas Schmitt
2019-04-25  9:45                       ` pelzflorian (Florian Pelz)
2019-04-25 13:44                         ` Thomas Schmitt
2019-04-25 14:59                           ` Danny Milosavljevic
2019-04-25 16:22                             ` Thomas Schmitt
2019-04-25 17:55                               ` Danny Milosavljevic
2019-04-25 18:46                                 ` Thomas Schmitt
2019-04-25 19:01                                   ` Danny Milosavljevic
2019-04-25 16:34                         ` Ludovic Courtès
2019-04-26 11:34                           ` pelzflorian (Florian Pelz)
2019-04-26 14:41                             ` Ludovic Courtès
2019-04-26 15:30                               ` pelzflorian (Florian Pelz)
2019-04-26 13:57                           ` Thomas Schmitt
2019-04-27 13:20                             ` Ludovic Courtès
2019-04-27 16:24                               ` Thomas Schmitt
2019-04-28 12:53                                 ` Ludovic Courtès
2019-04-25 11:49                   ` pelzflorian (Florian Pelz)
2019-04-25 15:09                     ` Thomas Schmitt
2019-04-25 15:58                       ` pelzflorian (Florian Pelz)
2019-04-25 16:40                         ` Thomas Schmitt

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