75 lines
2.5 KiB
Markdown
75 lines
2.5 KiB
Markdown
---
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title: Firmware
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description:
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published: true
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date: 2025-11-08T10:28:07.779Z
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tags:
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editor: markdown
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dateCreated: 2022-01-25T14:50:10.751Z
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---
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# Platform firmware
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Virtual devices, including virtual chipsets, are shipping alongside platform firmware.
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## SeaBIOS
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[SeaBIOS](https://www.seabios.org/SeaBIOS) is an implementation of an x86 BIOS which relies on [coreboot](https://www.coreboot.org/). It is used for legacy systems, but also to specialized and cloud optimized guests systems which don't require UEFI.
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## OVMF
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[OVMF](https://github.com/tianocore/tianocore.github.io/wiki/OVMF), which stands for Open Virtual Machine Firmware, is a UEFI-compatible firmware.
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It is based on the [TianoCore](https://www.tianocore.org/) project, which provides an open-source implementation of a platform firmware that follows UEFI specifications.
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It is the default method to boot UEFI-based operating systems in a virtual machine.
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Under Fedora-based systems such as Phyllome, firmware that can be used by virtual machines are stored in the following directory `/usr/share/edk2/ovmf`
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| Name | Feature |
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| :-- | --: |
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| OVMF_CODE.fd | |
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| OVMF_VARS.fd | |
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| OVMF_CODE_4M.qcow2 | |
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| OVMF_VARS_4M.qcow2 | |
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| OVMF_CODE_4M.secboot.pcrlock | |
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| OVMF_CODE_4M.secboot.qcow2 | |
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| OVMF_VARS_4M.secboot.qcow2 | |
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| OVMF_CODE.cc.fd | |
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| OVMF_CODE.secboot.fd | |
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| OVMF_CODE.secboot.pcrlock | |
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| OVMF_VARS.secboot.fd | |
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| OVMF.igvm | |
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| OVMF.qemuvars.fd | |
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| OVMF.stateless.fd | |
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| OVMF.stateless.secboot.fd | |
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| OVMF.stateless.secboot.pcrlock | |
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| OVMF.amdsev.fd | |
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| OVMF.inteltdx.fd | |
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| OVMF.inteltdx.secboot.fd | |
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## MicroVM
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## Rust Hypervisor Firmware
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The [Rust Hypervisor Firmware](https://github.com/cloud-hypervisor/rust-hypervisor-firmware) (RHF) is a UEFI-compatible firmware. It is focused on simplicity and performance and is designed to run cloud-centric operating systems.
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It is developed alongside the Cloud Hypervisor.
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## Supported features
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| | SeaBIOS | OVMF | RHF |
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| :-- | :-: | :-: | :-: |
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| *BIOS* | **Yes** | No | No |
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| *UEFI* | No | **Yes** | **Yes** |
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| *Secure Boot* | No | **Yes** | ? |
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| *Chipset* | [i440fx](/virt/vm/chipset#i440fx), [Q35](/virt/vm/chipset#q35) | [i440f](/virt/vm/chipset#i440fx), [Q35](/virt/vm/chipset#q35) | [virt](/virt/vm/chipset#virt) |
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| *Guests* | **Linux**, **Windows** | **Linux**, **Darwin**, **Windows** | **Linux**, **Windows** |
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| *Virtual Function I/O (VFIO)* | No | **Yes** | **Yes** |
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---
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*[**Go to parent page**](https://wiki.phyllo.me/)* |