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The SeaBIOS code can be built using standard GNU tools. A recent Linux
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distribution should be able to build SeaBIOS using the standard
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First, [obtain the code](Download). SeaBIOS can be compiled for
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several different build targets. It is also possible to configure
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additional compile time options - run **make menuconfig** to do this.
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Build for QEMU (along with KVM, Xen, and Bochs)
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-----------------------------------------------
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To build for QEMU (and similar), one should be able to run "make" in
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the main directory. The resulting file "out/bios.bin" contains the
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One can use the resulting binary with QEMU by using QEMU's "-bios"
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`qemu -bios out/bios.bin -fda myfdimage.img`
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One can also use the resulting binary with Bochs. For example:
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`bochs -q 'floppya: 1_44=myfdimage.img' 'romimage: file=out/bios.bin'`
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To build for coreboot please see the coreboot build instructions at:
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<http://www.coreboot.org/SeaBIOS>
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Build as a UEFI Compatibility Support Module (CSM)
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--------------------------------------------------
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To build as a CSM, first run kconfig (make menuconfig) and enable
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CONFIG_CSM. Then build SeaBIOS (make) - the resulting binary will be
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This binary may be used with the OMVF/EDK-II UEFI firmware. It will
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provide "legacy" BIOS services for booting non-EFI operating systems
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and will also allow OVMF to display on otherwise unsupported video
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hardware by using the traditional VGA BIOS. (Windows 2008r2 is known
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to use INT 10h BIOS calls even when booted via EFI, and the presence
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of a CSM makes this work as expected too.)
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Having built SeaBIOS with CONFIG_CSM, one should be able to drop the
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result (out/Csm16.bin) into an OVMF build tree at
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OvmfPkg/Csm/Csm16/Csm16.bin and then build OVMF with 'build -D
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CSM_ENABLE'. The SeaBIOS binary will be included as a discrete file
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within the 'Flash Volume' which is created, and there are tools which
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will extract it and allow it to be replaced.
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Overview of files in the repository
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===================================
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The **src/** directory contains the main bios source code. The
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**src/hw/** directory contains source code specific to hardware
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drivers. The **src/fw/** directory contains source code for platform
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firmware initialization. The **src/std/** directory contains header
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files describing standard bios, firmware, and hardware interfaces.
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The **vgasrc/** directory contains code for VGA BIOS implementations.
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This code is separate from the main BIOS code in the src/ directory.
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When the build is configured to produce a VGA BIOS the resulting
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binary is found in out/vgabios.bin. The VGA BIOS code is always
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compiled in 16bit mode.
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The **scripts/** directory contains helper utilities for manipulating
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and building the final roms.
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The **out/** directory is created by the build process - it contains
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all intermediate and final files.
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When reading the C code be aware that code that runs in 16bit mode can
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not arbitrarily access non-stack memory - see [Memory Model](Memory
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Model) for more details. For information on the major C code functions
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and where code execution starts see [Execution and code
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flow](Execution and code flow).
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docs/Build_overview.md
