isaset - set ISA registers
] addrreg datareg
] #for I2C-like access
] #for flat address space
isaset is a small helper program to set registers visible through the ISA bus.
- Enable flat address space mode.
- Disable interactive mode. By default, isaset 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.
- Perform a 16-bit write.
- Perform a 32-bit write.
Four options must be provided to isaset. addrreg
contains the ISA address
of the address register for the chip to probe; datareg
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 address
parameters are two integers between 0x00 and 0xFF. isaset will
write value value
to address address
. An optional mask
can be provided as a fifth parameter, preserving unmasked bits at the written
In flat mode, two parameters must be provided. address
contains the ISA
address of the register to write to; it is an integer between 0x0000 and
0xFFFF. Basically, it is the sum of the chip's base address and the chip
register's address. isaset will write value value
at this address. An
can be provided as a third parameter, preserving unmasked
bits at the written location.
Poking around in ISA data space is extremely dangerous. Running isaset with
random parameters can cause system crashes, data loss, and worse! Be extremely
careful when using this program.
Mark D. Studebaker, and the lm_sensors group (http://www.lm-sensors.org/)
This manual page was shamelessly ripped from the i2cset and isadump manual pages
by Jean Delvare.