1ISADUMP(8) System Manager's Manual ISADUMP(8)
2
6 isadump - examine ISA registers
7
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
14
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).
21
24 -f Enable flat address space mode.
25 -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.
30 -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.
37 -W Perform 16-bit reads.
39 -L Perform 32-bit reads.
41
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.
51 For Super-I/O chips, address register is typically at 0x2E with data
53 register at 0x2F.
54 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.
60
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.
68 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.
74
77 If no bank is specified, no bank change operation is performed.
78 If a bank is specified, the original value is restored before isadump
80 exits.
81 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.
89
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.
95
98 i2cdump(8), isaset(8)
99
102 Frodo Looijaard, Mark D. Studebaker, and the lm_sensors group
103 (https://hwmon.wiki.kernel.org/lm_sensors)
104 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.
109 April 2011 ISADUMP(8)