Provided by: coreboot-utils_4.15~dfsg-2_amd64 bug


       superiotool - Super I/O detection tool


       superiotool [-delVvh]


       superiotool is a GPL'd 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.

       The     list     of     supported     Super     I/O     chips     is     available      at,  but  it can also be viewed by running
       superiotool -l.


       If no command line option is specified, superiotool merely tries to detect the  Super  I/O
       chip.  You must use the -d option to dump the Super I/O register contents.

       -d, --dump
              Dump  Super  I/O  registers  (if  the  Super  I/O  chip is detected and superiotool
              supports the --dump option for this chip). The  output  will  look  something  like

              $ superiotool -d
              Found SMSC FDC37N769 (id=0x28, rev=0x01) at 0x3f0
              Register dump:
              idx 00 01 02 03 04 05 06 07 08 09 0a 0b 0c 0d 0e 0f 10 11...
              val 20 90 80 f4 00 00 ff 00 00 00 40 00 0e 28 01 00 00 00...
              def 28 9c 88 70 00 00 ff 00 00 00 00 00 02 28 NA 00 00 80...

              The  idx  fields  contain  the  register  numbers/indexes of the Super I/O, the val
              fields contain the contents of the respective register as read from the Super  I/O,
              and  the  def  fields  contain  the  default values for the respective register, as
              specified in the datasheet.

              The numbers in the output are all in hex format, and some special values  may  also
              occur:  NA  stands for not available (i.e., the datasheet doesn't specify a default
              value for the respective register), RR means  reserved  (the  datasheet  explicitly
              marks this register as reserved), and MM means misc, which can mean several things.
              It's recommended to consult the datasheet for detailed  information  about  the  MM

       -e, --extra-dump
              Dump  extra secondary register contents too, if available. Only in combination with
              the  --dump  option.  This  option  will,  for  instance,  dump  the  environmental
              controller  (EC)  configuration  registers  for the ITE IT8716F chip. The format is
              similar to the output of the --dump option.

       -l, --list-supported
              List all Super I/O chips recognized by superiotool.  The  phrase  (dump  available)
              following  a  chip  name  indicates that superiotool supports the --dump option for
              this chip.

       -V, --verbose
              Enable verbose mode. This option can be used together with the -d option.

              The verbose output will not only list for which type  of  Super  I/O  the  tool  is
              scanning,  but  also  at which configuration port it's probing, and which Super I/O
              initialization sequence is used. If no Super I/O was detected in a probing run, the
              returned  output  will  be  shown,  as  it  may  be  useful  for figuring out which
              (currently unrecognized) Super I/O chip this may be.

       -v, --version
              Show version information and exit.

       -h, --help
              Show a help text and exit.


       Please report any bugs on the coreboot mailing list (


       Please see the individual source code files and/or the README file.


       superiotool is covered by the GNU General Public License (GPL), either version  2  of  the
       License, or (at your option) any later version.



                                         January 18, 2008                          SUPERIOTOOL(8)