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

NAME

       isadump - examine ISA registers

SYNOPSIS

       isadump [-y] [-k V1,V2...]  addrreg datareg [bank [bankreg]] #for I2C-like access
       isadump [-y] -f address [range [bank [bankreg]]] #for flat address 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 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.

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.

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
       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 chip.

WARNING

       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.

SEE ALSO

       i2cdump(8), isaset(8)

AUTHOR

       Frodo Looijaard, Mark D. Studebaker, and the lm_sensors group (http://www.lm-sensors.org/)

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

								    August 2004 							ISADUMP(8)