isadump

ISADUMP(8)                  System Manager's Manual                 ISADUMP(8)

NAME
       isadump - examine ISA registers

SYNOPSIS
       isadump  [-y]  [-W|-L]  [-k V1,V2...]  addrreg datareg [bank [bankreg]]
       #for I2C-like access
       isadump -f [-y] [-W|-L] address [range [bank [bankreg]]] #for flat  ad-
       dress space

DESCRIPTION
       isadump  is a small helper program to examine registers visible through
       the ISA bus. It is intended to probe any chip that lives on the ISA bus
       working  with an address register and a data register (I2C-like access)
       or a flat range (of up to 256 bytes).

OPTIONS
       -f     Enable flat address space mode.

       -y     Disable interactive mode. By default, isadump will  wait  for  a
              confirmation from the user before messing with the ISA bus. When
              this flag is used, it will perform the operation directly.  This
              is mainly meant to be used in scripts.

       -k V1,V2...
              Specify  a  comma-separated list of bytes to send as the key se-
              quence to enter the  chip  configuration  mode.  Most  Super-I/O
              chips  need  this.  Known key sequences are: 0x87,0x01,0x55,0x55
              for ITE, 0x55 for SMSC, 0x87,0x87  for  Winbond  and  VIA,  none
              needed for National Semiconductor.

       -W     Perform 16-bit reads.

       -L     Perform 32-bit reads.

OPTIONS (I2C-like access mode)
       At  least two options must be provided to isadump. addrreg contains the
       ISA address of the address register for the chip to probe; datareg con-
       tains the address of the data register. Both addresses are integers be-
       tween 0x0000 and 0x3FFF. Usually, if the chip's base address is 0x0nn0,
       the  address  register is at 0x0nn5 and the data register is at 0x0nn6.
       The most common base address for hardware monitoring chips is 0x0290.

       For Super-I/O chips, address register is typically at  0x2E  with  data
       register at 0x2F.

       The bank and bankreg parameters are useful on the Winbond chips as well
       as on Super-I/O chips.  bank is  an  integer  between  0  and  31,  and
       bankreg  is  an  integer between 0x00 and 0xFF (default value: 0x4E for
       Winbond chips, 0x07 for Super-I/O chips).  The  W83781D  datasheet  has
       more information on bank selection.

OPTIONS (flat address space mode)
       In flat mode, only one parameter is mandatory. address contains the ISA
       address of the chip to probe; it  is  an  integer  between  0x0000  and
       0xFFFF.  If provided, range is how many bytes should be read (must be a
       multiple of 16). If the range isn't provided, it defaults to 256  bytes
       and the address is forcibly aligned on a 256-byte boundary.

       The  bank and bankreg parameters are useful on the National Semiconduc-
       tor PC87365 and PC87366 Super-I/O chips.  bank is an integer between  0
       and 31, and bankreg is an integer between 0x00 and 0xFF (default value:
       0x09; must fit in the specified range). See the PC87365  datasheet  for
       more information on bank selection.

NOTES
       If no bank is specified, no bank change operation is performed.

       If  a  bank is specified, the original value is restored before isadump
       exits.

       Dumping Super-I/O chips is typically a  two-step  process.  First,  you
       will  have  to  access the main Super-I/O address using a command like:
       isadump 0x2e 0x2f 0x09.  This will select  logical  device  9  (correct
       value depend on the chip). At 0x60 you will find the logical device ad-
       dress word, for example "ec c0".  Then you  can  use  a  command  like:
       isadump -f 0xecc0 16.  This will dump the logical device registers. The
       correct range depends on the chip.

WARNING
       Poking around in ISA data space is extremely dangerous.  Running  isad-
       ump  with  random  parameters  can cause system crashes, data loss, and
       worse!  Be extremely careful when using this program.

SEE ALSO
       i2cdump(8), isaset(8)

AUTHOR
       Frodo  Looijaard,  Mark  D.  Studebaker,  and  the   lm_sensors   group
       (https://hwmon.wiki.kernel.org/lm_sensors)

       This  manual  page  was  originally  written by David Z Maze <dmaze@de-
       bian.org> for the Debian GNU/Linux system. It  was  then  reviewed  and
       augmented  by  the  lm_sensors  team  and is now part of the lm_sensors
       source distribution.

                                  April 2011                        ISADUMP(8)