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Superiotool README
Superiotool is a user-space utility which can
- detect which Super I/O chip is soldered onto your mainboard,
- at which configuration port it's located (usually 0x2e or 0x4e), and
- dump all register contents of the Super I/O chip, together with the
default values as per datasheet (to make comparing the values easy).
It is mainly used for coreboot development purposes (see
for details on coreboot), but it may also be useful for other things.
$ svn co svn://
$ cd superiotool
$ make
$ sudo make install
Please read the superiotool(8) manpage or type 'superiotool --help'.
Per default (no options) superiotool will just probe for a Super I/O
and print its vendor, name, ID, revision, and config port.
Typical usage of superiotool:
- Probe/detect the Super I/O in your mainboard:
$ superiotool
- Register dump as table of hex-values of the Super I/O (if detected):
$ superiotool -d
Supported Super I/O Chips
Please see, or type
$ superiotool -l
There's also a collection of sample register dumps from various Super I/O
chips on that web page. Please send further register dumps (either from a
proprietary BIOS and/or from coreboot) to the coreboot mailing list
Website and Mailing List
The main website is
For additional information, patches, and discussions, please join the
coreboot mailing list at, where most
superiotool developers are subscribed.
Copyright and License
Superiotool is copyrighted by a number of individual developers. Please
refer to the respective source code files for details.
It is licensed under the terms of the GNU General Public License (GPL),
either version 2 of the license, or (at your option) any later version.
Bingxun Shi <>
Carl-Daniel Hailfinger <>
David Hendricks <>
Frieder Ferlemann <>
Idwer Vollering <>
Rasmus Wiman <>
Robinson P. Tryon <>
Ronald Hoogenboom <>
Ronald Minnich <>
Stefan Reinauer <>
Ulf Jordan <>
Uwe Hermann <>
Ward Vandewege <>