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. 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  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 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 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.

                                                   April 2011                                          ISASET(8)