Re: Help Creating Linux ISO

[MarcellusMajor]

Thomas,

The iso boot when using BIOS.

When I switch to UEFI i get the following

On 10/12/2020 3:49 AM, MarcellusMajor wrote:

> 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
> >
> >
> >       
>