- QEMU includes bundled option ROMs which are loaded by default unless a device is specifically setup with --romfile="".
- These options roms are bundled as binaries. The source code for the same can be found at http://ipxe.org/
- These options roms are useful for example when you want to PXE boot over a virtio-net device.
Here is an example of booting via Network PXE using the option ROM