Make it possible to change the size of the EFI partition

[mathieupost]

At the moment the size of the EFI partition is hard-coded to 32MB. I would like to install other bootloaders on the same usb device, but the limit of 32MB is too small for that. I multiplied the VENTOY_PART_SIZE, VENTOY_PART_SIZE_MB and VENTOY_SECTOR_NUM values by 16 in the tool/ventoy_lib.sh file which succesfully results in a EFI partition of 512MB.

This all seems to work fine until I boot from it. I get the following error message:

!!!!!!!!!!!! WARNING !!!!!!!!!!!!
!!!!!!!!!!!! WARNING !!!!!!!!!!!!
!!!!!!!!!!!! WARNING !!!!!!!!!!!!

This is NOT a standard Ventoy device and is NOT supported.

You should follow the instructions in https://www.ventoy.net to use Ventoy.

From what I can find this comes from the GRUB2/MOD_SRC/grub-2.04/grub-core/ventoy/ventoy.c file because of the following if-statement:

    if ((partition->number != 1) || (partition->len != 65536) || (offset != partition->start))

I'm not sure if this is the only place where this is checked and I'm not really proficient in writing C, but if someone can point me in the right directions, maybe I can help to remove this check or at least make it a configurable variable instead of hard-coded.

[elfring]

🤔 I hope also that the collaboration with other boot managers can be improved another bit.
The size requirements can be reconsidered then for the involved partitions, can't they?

[a1ive]

See 8bbd5a1

[elfring]

@a1ive: Do you know anybody who would like to add translations for the linked information?

[megapro17]

Anyway, why it's so small? What if some update will need bigger efi partition? It's already almost full

[parvindergithub]

Same problem with me ....
I want to integrate Grub2FM in efi partition mot 3rd partition

[steve6375]

Just add the grubfm_multiarch.iso to the first partition.

[selurvedu]

I would like to make this partition bigger as well. Some diagnostic tools can save reports and diagnostic files to FAT / EFI partitions, and VTOYEFI is just too small to fit them.

[Prototyped]

I'd like to boot a Windows-to-go VHDX, which requires the Windows boot manager and its support files to live on the EFI system partition. They don't fit alongside the Ventoy bootloader and support files in just 32 MB. :(

C:\Windows\System32>cd /d f:\

f:\>dir f:
 Volume in drive F is VTOYEFI
 Volume Serial Number is F767-A619

 Directory of f:\

23/08/2023  01:23    <DIR>          grub
23/08/2023  01:23    <DIR>          ventoy
23/08/2023  01:23    <DIR>          EFI
23/08/2023  01:23               829 ENROLL_THIS_KEY_IN_MOKMANAGER.cer
23/08/2023  01:23    <DIR>          tool
14/07/2024  08:13            13,471 z690 UD DDR4 Crambs
               2 File(s)         14,300 bytes
               4 Dir(s)      14,781,952 bytes free

f:\>bcdboot g:\Windows /s f: /f UEFI
Failure when attempting to copy boot files.

f:\>dir
 Volume in drive F is VTOYEFI
 Volume Serial Number is F767-A619

 Directory of f:\

23/08/2023  01:23    <DIR>          grub
23/08/2023  01:23    <DIR>          ventoy
23/08/2023  01:23    <DIR>          EFI
23/08/2023  01:23               829 ENROLL_THIS_KEY_IN_MOKMANAGER.cer
23/08/2023  01:23    <DIR>          tool
14/07/2024  08:13            13,471 z690 UD DDR4 Crambs
               2 File(s)         14,300 bytes
               4 Dir(s)         448,000 bytes free

[steve6375]

Ventoy can boot from VHD files directly. The size of the EFI partition cannot be changed and it's contents will be wiped and replaced every time you update the Ventoy version anyway.
https://ventoy.net/en/plugin_vhdboot.html