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| QEMU + Ventoy USB: UEFI boot always drops to EFI Shell instead of auto-boot |
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Posted by: EtaBeta - 01-22-2026, 08:29 PM - Forum: Ventoy Discussion Forum
- No Replies
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Post (English – faithful translation)
Hello,
I am trying to boot a Ventoy USB drive in UEFI mode using QEMU with OVMF, but QEMU always drops into the EFI Shell instead of automatically booting Ventoy.
What works - The Ventoy USB boots correctly on real hardware in UEFI mode
- The Ventoy USB boots correctly in QEMU using Legacy/BIOS mode
- From the EFI Shell, manual boot works:
fsX:cd EFI\BOOTBOOTX64.EFI
- After running this, Ventoy starts normally.
What does NOT work- Automatic UEFI boot when using QEMU
- Even when using:
- startup.nsh
- placed in the root of the USB
- Clean or regenerated OVMF VARS files
- Passing the USB drive directly as a raw block device
QEMU still always boots into the EFI Shell.
Environment- Host OS: Linux
- QEMU:
qemu-system-x86_64
- UEFI firmware:
OVMF_CODE_4M.fd
- +
OVMF_VARS_4M.fd
- USB drive passed as a raw block device
- Standard Ventoy layout (GPT with EFI partition)
Minimal QEMU command (manual boot only works)
Code: sudo qemu-system-x86_64 \
-m 2048 \
-drive if=pflash,format=raw,readonly=on,file=/usr/share/OVMF/OVMF_CODE_4M.fd \
-drive if=pflash,format=raw,file=/usr/share/OVMF/OVMF_VARS_4M.fd \
-drive file=/dev/sdX,format=raw
Question
Is this a known limitation or incompatibility between:- QEMU + OVMF
- and Ventoy UEFI boot from a USB device?
Are there:- recommended QEMU settings for Ventoy UEFI boot?
- known workarounds (other than manual EFI Shell boot)?
- an explanation of why OVMF does not automatically detect
BOOTX64.EFI
- on the Ventoy USB?
Thanks in advance for any clarification.
Written and then translated with the help of chatGPT
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| EXT, NTFS in 1st partition |
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Posted by: 4hotdogs - 10-29-2025, 03:58 AM - Forum: Ventoy Discussion Forum
- No Replies
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Ventoy can be booted in many ways, serving many needs.
I understand ExFAT is the preferred filesystem for the 1st partition, but that EXT and other filesystems are possible.
What are the downsides of using an EXT, or NTFS for the 1st partition? I am aware of the differences between filesystems, I am asking about the effect on other features in Ventoy?
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| Live ISO Building ? |
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Posted by: 4hotdogs - 10-29-2025, 03:48 AM - Forum: Ventoy Discussion Forum
- Replies (1)
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Ventoy is a wonderful app that is helpful in many ways.
I would like to boot to Ubuntu live ISO, install a program, then shutdown, and later boot back to the same ISO, and have the program still installed. Does Ventoy have a way to do this? Thank you.
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