1ISADUMP(8)                  System Manager's Manual                 ISADUMP(8)
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NAME

6       isadump - examine ISA registers
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SYNOPSIS

10       isadump  [-y]  [-W|-L]  [-k V1,V2...]  addrreg datareg [bank [bankreg]]
11       #for I2C-like access
12       isadump -f [-y] [-W|-L] address  [range  [bank  [bankreg]]]  #for  flat
13       address space
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DESCRIPTION

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

24       -f     Enable flat address space mode.
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26       -y     Disable interactive mode. By default, isadump will  wait  for  a
27              confirmation from the user before messing with the ISA bus. When
28              this flag is used, it will perform the operation directly.  This
29              is mainly meant to be used in scripts.
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31       -k V1,V2...
32              Specify  a  comma-separated  list  of  bytes  to send as the key
33              sequence to enter the chip configuration  mode.  Most  Super-I/O
34              chips  need  this.  Known key sequences are: 0x87,0x01,0x55,0x55
35              for ITE, 0x55 for SMSC, 0x87,0x87  for  Winbond  and  VIA,  none
36              needed for National Semiconductor.
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38       -W     Perform 16-bit reads.
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40       -L     Perform 32-bit reads.
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OPTIONS (I2C-like access mode)

44       At  least two options must be provided to isadump. addrreg contains the
45       ISA address of the address register for the chip to probe; datareg con‐
46       tains  the  address  of  the data register. Both addresses are integers
47       between 0x0000 and 0x3FFF. Usually,  if  the  chip's  base  address  is
48       0x0nn0,  the  address register is at 0x0nn5 and the data register is at
49       0x0nn6. The most common base address for hardware monitoring  chips  is
50       0x0290.
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52       For  Super-I/O  chips,  address register is typically at 0x2E with data
53       register at 0x2F.
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55       The bank and bankreg parameters are useful on the Winbond chips as well
56       as  on  Super-I/O  chips.   bank  is  an  integer between 0 and 31, and
57       bankreg is an integer between 0x00 and 0xFF (default  value:  0x4E  for
58       Winbond  chips,  0x07  for  Super-I/O chips). The W83781D datasheet has
59       more information on bank selection.
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OPTIONS (flat address space mode)

63       In flat mode, only one parameter is mandatory. address contains the ISA
64       address  of  the  chip  to  probe;  it is an integer between 0x0000 and
65       0xFFFF.  If provided, range is how many bytes should be read (must be a
66       multiple  of 16). If the range isn't provided, it defaults to 256 bytes
67       and the address is forcibly aligned on a 256-byte boundary.
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69       The bank and bankreg parameters are useful on the National  Semiconduc‐
70       tor  PC87365 and PC87366 Super-I/O chips.  bank is an integer between 0
71       and 31, and bankreg is an integer between 0x00 and 0xFF (default value:
72       0x09;  must  fit in the specified range). See the PC87365 datasheet for
73       more information on bank selection.
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NOTES

77       If no bank is specified, no bank change operation is performed.
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79       If a bank is specified, the original value is restored  before  isadump
80       exits.
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82       Dumping  Super-I/O  chips  is  typically a two-step process. First, you
83       will have to access the main Super-I/O address using  a  command  like:
84       isadump  0x2e  0x2f  0x09.   This will select logical device 9 (correct
85       value depend on the chip). At 0x60 you will  find  the  logical  device
86       address  word,  for  example "ec c0".  Then you can use a command like:
87       isadump -f 0xecc0 16.  This will dump the logical device registers. The
88       correct range depends on the chip.
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WARNING

92       Poking  around in ISA data space is extremely dangerous.  Running isad‐
93       ump with random parameters can cause system  crashes,  data  loss,  and
94       worse!  Be extremely careful when using this program.
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SEE ALSO

98       i2cdump(8), isaset(8)
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AUTHOR

102       Frodo   Looijaard,   Mark  D.  Studebaker,  and  the  lm_sensors  group
103       (https://hwmon.wiki.kernel.org/lm_sensors)
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105       This  manual  page   was   originally   written   by   David   Z   Maze
106       <dmaze@debian.org>  for  the  Debian  GNU/Linux  system.  It  was  then
107       reviewed and augmented by the lm_sensors team and is now  part  of  the
108       lm_sensors source distribution.
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112                                  April 2011                        ISADUMP(8)
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