docs/install: note about different ROM image file names
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@ -21,6 +21,98 @@ If you're already running libre firmware on your board, you should decide for
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sure whether you wish to risk it. See changelogs on
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the [release logs](../release.md) and decide for yourself.
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About ROM image file names
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==========================
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Init types and display mode
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---------------------------
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NOTE: On Libreboot 20210522, `libgfxinit` in the only init type provided on
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the pre-compiled ROM images, but the build system does support other types
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defined below.
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NOTE: regardless of init type, on desktops, an external/add-on GPU can always
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be used. On laptop hardware in Libreboot, libgfxinit will always be used. On
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desktop/server hardware, if available, libgfxinit will also always be used by
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default (but in that setup, SeaBIOS can be used if you want to use an add-on
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graphics card, e.g. on KCMA-D8, KGPE-D16, GA-G41M-ES2L)
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### libgfxinit
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In this setup, on supported systems, coreboot's own native video initialization
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code is used. This is referred to generically as libgfxinit, which is coreboot's
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library in `3rdparty/libgfxinit` but not all boards with native video
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initialization use libgfxinit; some of them are using coreboot's older style
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of video initialization method, written purely in C.
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#### corebootfb (libgfxinit)
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high resolution coreboot framebuffer used on startup
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#### txtmode (libgfxinit)
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int10h text mode is used on startup.
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### vgarom
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NOTE: no configs in libreboot are currently available that use this method.
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With this method, coreboot is finding, loading and executing a VGA option ROM
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for your graphics hardware. This would not be done on laptops, because that
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implies supplying non-free binary blobs in Libreboot, so this setup would only
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ever be provided on desktop hardware where no GPU exists or where it is
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desirable for you to use an external/add-on graphics card
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#### vesafb (vgarom)
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high resolution VESA framebuffer used on startup
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#### txtmode (vgarom)
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int10h text mode is used on startup
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### normal
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int10h text mode startup is implied here.
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In this setup, coreboot is neither implementing libgfxinit / native graphics
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initialization nor is it finding/loading/executing VGA option ROMs. In this
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setup, SeaBIOS would most likely be used for that.
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The `normal` setup is supported in the Libreboot 20210522 build system, but not
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currently used. It is there for desktop hardware that will be added in the
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future, where those desktop boards do not have an onboard GPU and therefore an
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add-on GPU is always used..
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Payload names
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-------------
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### grub
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ROM images with just `grub` in the file name will start first with the GNU GRUB
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payload. They may or may not also provide other payloads in the menu, such as
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memtest86+, SeaBIOS, Tianacore and so on.
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### seabios
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ROM images with just `seabios` in the file name will start first with the
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SeaBIOS payload. They will only contain SeaBIOS, but may also contain memtest as
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an option in the boot menu.
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### seabios\_withgrub
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ROM images that have `seabios_withgrub` in the file name start with SeaBIOS
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first, but also have GNU GRUB available in the boot menu when you press ESC.
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### seabios\_grubfirst
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ROM images that have `seabios_grubfirst` in the file name start with SeaBIOS,
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but SeaBIOS is configured via special `bootorder` file in CBFS so as to ONLY
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load GNU GRUB. This setup would be most useful on desktops, where you wish to
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only have GNU GRUB available, but want to use an add-on GPU while also having
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the option to use libgfxinit, if a supported GPU/framebuffer chip is present
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on your board.
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Which systems are supported?
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============================
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