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

Launchpad Bug Tracker 1785033 at bugs.launchpad.net
Thu Aug 16 03:57:57 UTC 2018


You have been subscribed to a public bug by Anthony Wong (anthonywong):

[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 committed and accepted by maintainer
http://git.savannah.gnu.org/cgit/grub.git/commit/?id=886edba8770ccbc3def0af2a7d6b346d00d0af2f

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


** Tags: patch
-- 
GRUB needs to support 64-bit efi linear frame buffer address
https://bugs.launchpad.net/bugs/1785033
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