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       isadump - examine ISA registers


       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 address space


       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).


       -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 sequence 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 contains the address of the data register.
       Both addresses are integers between 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  Semiconductor  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.


       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 address 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


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


       i2cdump(8), isaset(8)


       Frodo    Looijaard,    Mark    D.     Studebaker,     and     the     lm_sensors     group

       This  manual page was originally written by David Z Maze <> 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)