TLDR: It is kind of doable. However, Duet/Clover can only recognize SATA disk, neither nvme nor usb.
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What is DUET ?
- DUET is the forgotten UEFI emulator from tianocore years ago. They kind of abandoned this project after OVMF is out.
- You can still get and build DUET from tianocore. For those who dont want to build DUET from source, I find this project. However, use it on your own risk.
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What is Clover ?
- Clover is a bootloader than can be booted from UEFI or legacy, and can chain UEFI or legacy.
- You can get a bootable ISO here.
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Why DUET/Clover ?
- Someone may want to run UEFI, however, they may not want to flash tianocore/ovmf, like me.
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DUET approach
- A brief description can be found here.
- Prepare a FAT partition. I recommend you use SATA disk with MBR partition table here.
- You need to write a usable MBR to target drive. You can use
dd bs=440 count=1 conv=notrunc if=/path/to/mbr.bin of=/target/drive=or/imageto write it. - mbr.bin from syslinux can be used here.
- And you need to write bootDuet’s pbr to target partition, which must be FAT 12/16/32, based on your choice.
- After that, copy DUET’s Efildr.
- You can use tianocore_uefi_duet_installer’s
duet_installscript, which support only FAT32. However, you may still need to write MBR manually.
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Clover approach
- chain boot clover’s iso from your bootloader. Or, flash that iso to somewhere and chain boot it (not tested).
- I prefer this way. DUET is a dead project. Clover is still alive and widely used.
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After that
- You need to prepare a FAT partition. If you use DUET, you have already got one.
- DUET does not recognize nvme devices for me. If you succeed on this, tell me about it please.
- Prepare some EFI applications, copy them the that FAT partition.
- Reboot to DUET/Clover, and boot that application.
