Re: Help Creating Linux ISO

[MarcellusMajor]

hi Thomas,

>From where did you get images/efiboot.img ?

  They came from a rhel 7 iso

What text output do you get from inspecting that ISO by

GNU xorriso 1.5.3 : RockRidge filesystem manipulator, libburnia project.

xorriso : NOTE : ISO image bears MBR with  -boot_image any
partition_offset=16
xorriso : NOTE : Loading ISO image tree from LBA 0
xorriso : UPDATE :    1448 nodes read in 1 seconds
xorriso : NOTE : Detected El-Torito boot information which currently is
set to be discarded
Drive current: -indev 'target/csg-3.0.0.0_RC16.0.0.65SBR-x86_64-HYBRID.iso'
Media current: stdio file, overwriteable
Media status : is written , is appendable
Boot record  : El Torito , MBR isohybrid cyl-align-off GPT
Media summary: 1 session, 2484027 data blocks, 4852m data,  409g free
Volume id    : 'ISOIMAGE'
System area options: 0x00000202
System area summary: MBR isohybrid cyl-align-off GPT
ISO image size/512 : 9936108
Partition offset   : 16
MBR heads per cyl  : 0
MBR secs per head  : 0
MBR partition table:   N Status  Type        Start       Blocks
MBR partition      :   1   0x80  0x00           64      9936044
MBR partition      :   2   0x00  0xef         2080        17420
MBR partition path :   2  /images/efiboot.img
GPT                :   N  Info
GPT disk GUID      :      675378528c453c4489003487aa253601
GPT entry array    :      2  248  overlapping
GPT lba range      :      64  9936044  9936107
GPT partition name :   1  490053004f00480079006200720069006400
GPT partname local :   1  ISOHybrid
GPT partition GUID :   1  675378528c453c4489013487aa253601
GPT type GUID      :   1  a2a0d0ebe5b9334487c068b6b72699c7
GPT partition flags:   1  0x1000000000000001
GPT start and size :   1  64  9935980
GPT partition name :   2  490053004f004800790062007200690064003100
GPT partname local :   2  ISOHybrid1
GPT partition GUID :   2  675378528c453c4489023487aa253601
GPT type GUID      :   2  a2a0d0ebe5b9334487c068b6b72699c7
GPT partition flags:   2  0x1000000000000001
GPT start and size :   2  2080  17420
GPT partition path :   2  /images/efiboot.img
El Torito catalog  : 519  1
El Torito cat path : /isolinux/boot.cat
El Torito images   :   N  Pltf  B   Emul  Ld_seg  Hdpt  Ldsiz         LBA
El Torito boot img :   1  BIOS  y   none  0x0000  0x00      4        4875
El Torito boot img :   2  UEFI  y   none  0x0000  0x00  17420         520
El Torito img path :   1  /isolinux/isolinux.bin
El Torito img opts :   1  boot-info-table isohybrid-suitable
El Torito img path :   2  /images/efiboot.img


I did notice that the rhel iso had the following entry

GPT entry array    :      2  248  overlapping

Could that make ha[mmajor@localhost csg-core]$ xorriso -indev
~/Downloads/rhel-server-7.6-x86_64-dvd.iso -report_system_area plain
-report_el_torito plain
GNU xorriso 1.5.3 : RockRidge filesystem manipulator, libburnia project.

xorriso : NOTE : Loading ISO image tree from LBA 0
xorriso : UPDATE :    5351 nodes read in 1 seconds
xorriso : NOTE : Detected El-Torito boot information which currently is
set to be discarded
Drive current: -indev
'/home/mmajor/Downloads/rhel-server-7.6-x86_64-dvd.iso'
Media current: stdio file, overwriteable
Media status : is written , is appendable
Boot record  : El Torito , MBR isohybrid cyl-align-off GPT
Media summary: 1 session, 2195639 data blocks, 4288m data,  409g free
Volume id    : 'RHEL-7.6 Server.x86_64'
System area options: 0x00000202
System area summary: MBR isohybrid cyl-align-off GPT
ISO image size/512 : 8782556
Partition offset   : 0
MBR heads per cyl  : 0
MBR secs per head  : 0
MBR partition table:   N Status  Type        Start       Blocks
MBR partition      :   1   0x80  0x00            0      8783872
MBR partition      :   2   0x00  0xef       860440        17420
MBR partition path :   2  /images/efiboot.img
GPT                :   N  Info
GPT backup problems:      Implausible header LBA 8783870
GPT disk GUID      :      67f0876173ee984499d43fbead4070b8
GPT entry array    :      2  128  separated
GPT lba range      :      34  8783838  8783870
GPT partition name :   1 
49000000530000004f0000004800000079000000620000007200
GPT partname local :   1  I
GPT partition GUID :   1  e58b0b8a96927c48b3e0a2ac4256a3dd
GPT type GUID      :   1  a2a0d0ebe5b9334487c068b6b72699c7
GPT partition flags:   1  0x0000000000000000
GPT start and size :   1  0  393949
GPT partition name :   2  49000000530000004f000000480000007900
GPT partname local :   2  I
GPT partition GUID :   2  622759d76503504c84bc1a721a707065
GPT type GUID      :   2  a2a0d0ebe5b9334487c068b6b72699c7
GPT partition flags:   2  0x0000000000000000
GPT start and size :   2  860440  17420
GPT partition path :   2  /images/efiboot.img
El Torito catalog  : 815  1
El Torito cat path : /isolinux/boot.cat
El Torito images   :   N  Pltf  B   Emul  Ld_seg  Hdpt  Ldsiz         LBA
El Torito boot img :   1  BIOS  y   none  0x0000  0x00      4      305935
El Torito boot img :   2  UEFI  y   none  0x0000  0x00  17420      215110
El Torito img path :   1  /isolinux/isolinux.bin
El Torito img opts :   1  boot-info-table isohybrid-suitable
El Torito img path :   2  /images/efiboot.imgve some impact?


Below is the RHEL 7 inspection

On 10/12/2020 2:51 AM, Thomas Schmitt wrote:
> Hi,
>
>> Could you let me know what I am doing wrong?
> There are surplus EFI boot images by the arguments beginning at the second
> -eltorito-alt-boot.
> It might be confusing to the boot firmware that the same EFI boot image is
> listed twice in the El Torito boot catalog.
>
> This would make the ISO without duplication of EFI images:
>
>   xorrisofs \
>     -o target/csg-3.0.0.0_RC16.0.0.65SBR-x86_64-HYBRID.iso \
>     -b isolinux/isolinux.bin \
>     -c isolinux/boot.cat \
>     -no-emul-boot -boot-load-size 4 -boot-info-table \
>     -isohybrid-mbr /usr/share/syslinux/isohdpfx.bin \
>     -partition_offset 16 \
>     -eltorito-alt-boot \
>     -e images/efiboot.img \
>     -no-emul-boot -isohybrid-gpt-basdat \
>     target/dvd
>
> From where did you get images/efiboot.img ?
>
> If you used a RHEL ISO as source of files:
> Does that ISO boot ?
> Is it available for public download ?
> What text output do you get from inspecting that ISO by
>   iso=...path.to.original.ISO...
>   xorriso -indev "$iso" -report_el_torito as_mkisofs
> ?
>
> If you made efiboot.img yourself:
> What's in it ?
> Did you compare the files in efiboot.img with those in an original RHEL
> ISO ?
>
>
> Have a nice day :)
>
> Thomas
>
>