[Bug 1860640] Re: Add / Enable "32Bit UEFI Support" in Ubuntu?

[lorn10]

** Description changed:

  Hi there!
  
  I want to add here a request regarding the addition of a very nice,
- currently Fedora-exclusive, feature. It's called "32Bit UEFI Support" an
- makes it possible to boot and install a 64bit Linux onto a 32 bit (U)EFI
- based system which contains a 64bit CPU.
+ currently Fedora-exclusive, feature. It's called "32Bit UEFI Support"
+ and makes it possible to boot and install a 64bit Linux onto a 32 bit
+ (U)EFI based system which contains a 64bit CPU.
  
  Source: https://fedoraproject.org/wiki/Changes/32BitUefiSupport
  
  So far I understand, this works through a special modified BOOTIA32.EFI
  file. That one acts as some kind of a "wrapper" which converts some
  (essential) EFI64 calls to EFI32 (during the boot-up).
  
  I have tested this principle with latest Fedora 31 at an early Intel
  iMac which contains a 64bit CPU but has a 32bit EFI. To my big surprise
  it works absolutely GREAT!
  
  There exist currently some ways to apply this principle also at other
  Linux Distros like Ubuntu and Debian. Unfortunately these are all quite
  complex and needs a lot of modifications. More information can be found
  at the following link:
  
  https://medium.com/@realzedgoat/a-sorta-beginners-guide-to-installing-
  ubuntu-linux-on-32-bit-uefi-machines-d39b1d1961ec
  
  I tried to modify a Kubuntu 18.04 LTS DVD ISO image but I failed. Fedora
  Linux uses a quite different DVD install layout (folder & file
  organization) which is not easy applicable at Ubuntu / Debian based
  Distros. In detail I tried to copy the mentioned BOOTIA32.EFI wrapper
  file into the /EFI/boot directory. Well, the edited / modified Kubuntu
  DVD image was not recognized by the 32bit EFI firmware (at an iMac). I
  have uploaded some of the needed files. Fedora seems to include also a
  special macboot.img file which is not present (in that form) in Ubuntu.
  
  Kind regards
  
  C. Leu

-- 
You received this bug notification because you are a member of Ubuntu
Foundations Bugs, which is subscribed to efibootmgr in Ubuntu.
https://bugs.launchpad.net/bugs/1860640

Title:
  Add / Enable "32Bit UEFI Support" in Ubuntu?

Status in efibootmgr package in Ubuntu:
  New

Bug description:
  Hi there!

  I want to add here a request regarding the addition of a very nice,
  currently Fedora-exclusive, feature. It's called "32Bit UEFI Support"
  and makes it possible to boot and install a 64bit Linux onto a 32 bit
  (U)EFI based system which contains a 64bit CPU.

  Source: https://fedoraproject.org/wiki/Changes/32BitUefiSupport

  So far I understand, this works through a special modified
  BOOTIA32.EFI file. That one acts as some kind of a "wrapper" which
  converts some (essential) EFI64 calls to EFI32 (during the boot-up).

  I have tested this principle with latest Fedora 31 at an early Intel
  iMac which contains a 64bit CPU but has a 32bit EFI. To my big
  surprise it works absolutely GREAT!

  There exist currently some ways to apply this principle also at other
  Linux Distros like Ubuntu and Debian. Unfortunately these are all
  quite complex and needs a lot of modifications. More information can
  be found at the following link:

  https://medium.com/@realzedgoat/a-sorta-beginners-guide-to-installing-
  ubuntu-linux-on-32-bit-uefi-machines-d39b1d1961ec

  I tried to modify a Kubuntu 18.04 LTS DVD ISO image but I failed.
  Fedora Linux uses a quite different DVD install layout (folder & file
  organization) which is not easy applicable at Ubuntu / Debian based
  Distros. In detail I tried to copy the mentioned BOOTIA32.EFI wrapper
  file into the /EFI/boot directory. Well, the edited / modified Kubuntu
  DVD image was not recognized by the 32bit EFI firmware (at an iMac). I
  have uploaded some of the needed files. Fedora seems to include also a
  special macboot.img file which is not present (in that form) in
  Ubuntu.

  Kind regards

  C. Leu

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/efibootmgr/+bug/1860640/+subscriptions