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The wiki is being retired!

Documentation is now handled by the same processes we use for code: Add something to the Documentation/ directory in the coreboot repo, and it will be rendered to Contributions welcome!

Superiotool is a GPL'd user-space helper tool for coreboot development purposes (but may also be useful for other things). It allows you to detect which Super I/O you have on your mainboard, and it can provide detailed information about the register contents of the Super I/O.

This utility should work on most modern UNIX-like operating systems; it has been tested on at least Linux and FreeBSD.

Support of various devices

Vendor Super I/O Detect Dump BIOS CB2
ALi M1535/M1535D/M1535+/M1535D+ Yes Yes 1
ALi M5105 No No
ALi M5107 No No
ALi M5109 No No
ALi M5113 No No
ALi M5119 No No
ALi M512x Yes No
ALi M513x No No
ALi M513xB No No
ALi M513xF No No
ALi M514x No No
ASUS A8000 Yes Yes 1, 2, 3
Fintek F71862FG / F71863FG Yes Yes
Fintek F71869AD Yes Yes
Fintek F71889 Yes Yes 1
Fintek F71872F/FG / F71806F/FG Yes No
Fintek F71882FG/F71883FG Yes Yes 1, 2
Fintek F71805F/FG Yes Yes 1
Fintek F8000 Yes No
Chips&Tech F82C711 No No
Chips&Tech F82C712 No No
Chips&Tech F82C721 No No
Chips&Tech F82C735 No No
ITE IT8228E Yes No
ITE IT8502E/F Yes No
ITE IT8510E/TE/G Yes No
ITE IT8511E/TE/G Yes No
ITE IT8512E/TE/G Yes No
ITE IT8661F/IT8770F Yes Yes 1
ITE IT8671F/IT8687R Yes Yes 1
ITE IT8673F Yes No
ITE IT86793 No No
ITE IT8702F Yes No
ITE IT8703F Yes Yes
ITE IT8705F/AF / IT8700F Yes Yes 1, 2
ITE IT8706R Yes No
ITE IT8708F Yes Yes 1
ITE IT8710F Yes No
ITE IT8711F Yes No
ITE IT8712F Yes Yes
ITE IT8716F Yes Yes 1, 2 1
ITE IT8718F Yes Yes 1, 2, 3
ITE IT8720F Yes Yes
ITE IT8721F Yes No
ITE IT8722F Yes No
ITE IT8726F Yes Yes
ITE IT8761E Yes No
ITE IT8780F Yes No
HMC HMC83755 No No
Holtek HT6552IR No No
NSC1 NS307 No No
NSC1 NS308 No No
NSC1 NS309 No No
NSC1 NS317 No No
NSC1 NS338 No No
NSC1 NS351 No No
NSC1 PC97307 Yes Yes 1
NSC1 PC87317 Yes Yes
NSC1 PC97317 Yes Yes
NSC1 PC87309 Yes Yes
NSC1 PC87360 Yes Yes 1
NSC1 PC87351 Yes Yes
NSC1 PC87364 Yes Yes 1
NSC1 PC87365 Yes No
NSC1 PC87363 Yes No
NSC1 PC87366 Yes Yes
NSC1 PC87382 Yes Yes
NSC1 PC8739x Yes Yes 1
NSC1 PC87591x Yes No
NSC1 PC8741x Yes Yes
NSC1 PC87372 Yes No
NSC1 PC8374L Yes Yes 1, 2
NSC1 PC87427 Yes Yes
NSC1 PC87373 Yes No
Nuvoton WPCE775x / NPCE781x Yes Yes
Nuvoton WPCM450 Yes No
Nuvoton NCT6776F (B) Yes Yes
Nuvoton NCT6776F (C) Yes Yes
Vendor Super I/O Detect Dump BIOS CB2
SMSC FDC37N971 Yes Yes 1
SMSC FDC37N972 Yes Yes
SMSC LPC47N252 Yes Yes 1
SMSC LPC47M172 Yes No
SMSC FDC37C67x Yes Yes
SMSC FDC37B80x/FDC37M707 Yes No
SMSC FDC37N958FR Yes Yes 1
SMSC FDC37B77x Yes No
SMSC FDC37B78x Yes Yes
SMSC FDC37M602 Yes No
SMSC FDC37M60x Yes No
SMSC FDC37B72x Yes Yes
SMSC FDC37M81x Yes Yes
SMSC LPC47B27x Yes Yes 1 1
SMSC LPC47B37x Yes No
SMSC LPC47U33x Yes Yes
SMSC LPC47B34x Yes No
SMSC LPC47S42x Yes No
SMSC LPC47M10x/112/13x Yes Yes 1
SMSC LPC47B357 Yes No
SMSC LPC47M14x Yes No
SMSC LPC47M15x/192/997 Yes Yes 1 1
SMSC LPC47S45x Yes No
SMSC LPC47M292 Yes No
SMSC LPC47B387 Yes No
SMSC LPC47B397 Yes No
SMSC LPC47M182 Yes Yes
SMSC LPC47M584 Yes No
SMSC MEC1308 Yes Yes
SMSC A8000 Yes Yes
SMSC DME1737 Yes Yes
SMSC SCH5504 Yes No
SMSC LPC47N217 Yes No
SMSC SCH3112 Yes No
SMSC SCH3114 Yes No
SMSC SCH3116 Yes No
SMSC SCH5307 Yes No
SMSC SCH5317 Yes No
SMSC SCH5027 Yes No
SMSC SCH4307 Yes No
SMSC FDC37C669 Yes No
SMSC LPC47N237 Yes No
SMSC FDC37N769 Yes Yes 1
SMSC FDC37N3869/FDC37N869 Yes No
SMSC LPC47N227 Yes Yes 1
SMSC SIO10N268 Yes Yes
SiS SIS6801 No No
SiS SIS950 No No
Vendor Super I/O Detect Dump BIOS CB2
VIA VT82C686A/VT82C686B Yes No
Winbond W83977CTF Yes No
Winbond W83977EF/EG Yes Yes 1
Winbond W83527HG Yes No
Winbond W83627SF Yes No
Winbond W83697HF/F/HG Yes Yes 1
Winbond W83L517D/D-F Yes No
Winbond W83637HF/HG Yes No
Winbond W83627THF/THG Yes Yes 1, 2, 3, 4 1
Winbond W83627DHG Yes Yes 1
Winbond W83627DHG-P/-PT Yes Yes
Winbond W83627UHG Yes No
Winbond W83667HG Yes No
Winbond W83977F-A/G-A/AF-A/AG-A Yes No
Winbond W83977AF Yes No
Winbond W83977TF Yes Yes
Winbond W83977ATF Yes No
Winbond W83627HF/F/HG/G Yes Yes 1, 2, 3
Winbond W83697SF/UF/UG Yes Yes 1
Winbond W83627EHF/EF/EHG/EG Yes Yes 1, 2, 3
Winbond W83877F Yes No
Winbond W83877AF Yes Yes [1]
Winbond W83877TF Yes No
Winbond W83877ATF Yes No
Winbond WPCD376I Yes Yes 1
UMC UM82C862 No No
UMC UM8663BF No No
UMC UM8669 No No
UMC UM8670 No No

Extended dumps (EC, HWM) available for:

Use the --extra-dump option to see the contents of these registers.

Vendor Super I/O Detect Dump BIOS CB2
ITE IT8716F EC Yes Yes 1
ITE IT8718F EC Yes Yes 1
Winbond W83627THF/THG HWM Yes Yes
SMSC LPC47N227 runtime register block Yes Yes

1 Previosly National Semiconductor, now bought by Winbond.
2 Register dump output from a running coreboot system (vs. proprietary BIOS).


Manual installation

$ git clone
$ cd coreboot/util/superiotool
$ make
$ sudo make install

Debian / Ubuntu

$ apt-get install superiotool


$ yum install superiotool


Probe/detect the Super I/O in your mainboard:

$ superiotool

Register dump as table of hex-values (if the Super I/O is detected):

$ superiotool -d

Please see the README or the HOWTO for further information.

GNU head This work is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or any later version. This work is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.