Zero-bloat Ratatui in UEFI, no OS
qemu-demo.mp4
physical-demo.mp4
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Install packages:
pacman -S qemu-system-x86_64 edk2-ovmf
(optionally, install some graphics backend, but you can also VNC into the VM)
pacman -S qemu-ui-sdl
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Create virtual EFI layout
just create-virtual-uefi-layout
then build and symlink the
.efiin:
(<EFI>is something like./target/x86_64-unknown-uefi/debug/<PACKAGE-NAME>.efi)ln -sf <EFI> esp/efi/boot/bootx64.efi
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Start QEMU
just qemu
from https://rust-osdev.github.io/uefi-rs/tutorial/hardware.html
Connect a USB drive. Follow steps below.
# Create the GPT, create a 9MB partition starting at 1MB, and set the
# partition type to EFI System.
sgdisk \
--clear \
--new=1:1M:10M \
--typecode=1:C12A7328-F81F-11D2-BA4B-00A0C93EC93B \
/path/to/disk
# Format the partition as FAT.
mkfs.fat /path/to/disk_partition
# Mount the partition.
mount --mkdir /path/to/disk_partition /mnt/ratatuefi
# Create the boot directory.
mkdir -p /mnt/ratatuefi/EFI/BOOT
# Copy in the boot executable.
cp $CARGO_TARGET_DIR/x86_64-unknown-uefi/debug/ratatuefi.efi /mnt/ratatuefi/EFI/BOOT/BOOTX64.EFI
# Eject the USB drive
eject /path/to/diskImportant
disable secure boot on machine before trying to boot
try booting it!
it is slow as hell to draw. could possibly be improved by
- adding a buffer, and rendering full lines? currently we are rawdoggin character-for-character.
- switching to manual VGA graphics (use mousefood?)
was fixed by using -display sdl,gl=on!
somehow running without OpenGL makes it really slow!