ISASET(8)                 (April 2011)                  ISASET(8)

     NAME
          isaset - set ISA registers

     SYNOPSIS
          isaset [-y] [-W|-L] addrreg datareg address value [mask]
          #for I2C-like access
          isaset -f [-y] [-W|-L] address value [mask] #for flat
          address space

     DESCRIPTION
          isaset is a small helper program to set registers visible
          through the ISA bus.

     OPTIONS
          -f   Enable flat address space mode.

          -y   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.

          -W   Perform a 16-bit write.

          -L   Perform a 32-bit write.

     OPTIONS (I2C-like access mode)
          Four options must be provided to isaset. 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. Usu-
          ally, if the chip's base address is 0x0nn0, the address reg-
          ister 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 and value
          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 location.

     OPTIONS (flat address space mode)
          In flat mode, two parameters must be provided. address con-
          tains the ISA address of the register to write to; it is an
          integer between 0x0000 and 0xFFFF. Basically, it is the sum

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     ISASET(8)                 (April 2011)                  ISASET(8)

          of the chip's base address and the chip register's address.
          isaset will write value value at this address.  An optional
          mask can be provided as a third parameter, preserving
          unmasked bits at the written location.

     WARNING
          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.

     SEE ALSO
          i2cset(8), isadump(8)

     AUTHOR
          Mark D. Studebaker, and the lm_sensors group
          (https://hwmon.wiki.kernel.org/lm_sensors)

          This manual page was shamelessly ripped from the i2cset and
          isadump manual pages by Jean Delvare.

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