[Bug 1785033] [NEW] GRUB needs to support 64-bit efi linear frame buffer address

[Ivan Hu]

Public bug reported:

[Rationale]
More firmwares support above 4G mmio configureation and the EFI Graphics Output Protocol can return a 64-bit linear frame buffer address have been implemented in some firmware/BIOS. Grub2 currently only pass 32-bit framebuffer base to kernel. The Linux kernel has already added support to handle 64-bit linear framebuffer address in the efifb driver now. So GRUB2 should support 64-bit EFI linear frame buffer address.

[Impact]
Some machines block booting with firmware/bios implemented 64-bit EFI linear frame buffer address,due to Grub passing incorrect(only 32-bit) EFI linear frame buffer.

[Test cases]

Need Bios/Firmware support, 
1) Make sure the machine with the Bios implemented 64-bit EFI linear frame buffer address. some machine need to enable above 4G mmio on bios setup menu.
2) Boot up.


[Solution]
A patch has been commited and accepted by maintainer
http://git.savannah.gnu.org/cgit/grub.git/commit/?id=886edba8770ccbc3def0af2a7d6b346d00d0af2f

** Affects: grub2 (Ubuntu)
     Importance: Undecided
         Status: New

-- 
You received this bug notification because you are a member of Ubuntu
Foundations Bugs, which is subscribed to grub2 in Ubuntu.
https://bugs.launchpad.net/bugs/1785033

Title:
  GRUB needs to support 64-bit efi linear frame buffer address

Status in grub2 package in Ubuntu:
  New

Bug description:
  [Rationale]
  More firmwares support above 4G mmio configureation and the EFI Graphics Output Protocol can return a 64-bit linear frame buffer address have been implemented in some firmware/BIOS. Grub2 currently only pass 32-bit framebuffer base to kernel. The Linux kernel has already added support to handle 64-bit linear framebuffer address in the efifb driver now. So GRUB2 should support 64-bit EFI linear frame buffer address.

  [Impact]
  Some machines block booting with firmware/bios implemented 64-bit EFI linear frame buffer address,due to Grub passing incorrect(only 32-bit) EFI linear frame buffer.

  [Test cases]

  Need Bios/Firmware support, 
  1) Make sure the machine with the Bios implemented 64-bit EFI linear frame buffer address. some machine need to enable above 4G mmio on bios setup menu.
  2) Boot up.

  
  [Solution]
  A patch has been commited and accepted by maintainer
  http://git.savannah.gnu.org/cgit/grub.git/commit/?id=886edba8770ccbc3def0af2a7d6b346d00d0af2f

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/grub2/+bug/1785033/+subscriptions