microcode_ctl

MICROCODE_CTL(8)            System Manager's Manual           MICROCODE_CTL(8)



NAME
       microcode_ctl - microcode utility for Intel IA32 processors

SYNOPSIS
       microcode_ctl [-h] [-i] [-u [-q]] [-Q] [-f microcode]

DESCRIPTION
       The microcode_ctl utility is a companion to the IA32 microcode driver
       written by Tigran Aivazian <tigran@veritas.com>. The utility has two
       uses:

       a) it decodes and sends new microcode to the kernel driver to be
       uploaded to Intel IA32 processors. (Pentium Pro, PII, Celeron, PIII,
       Xeon, Pentium 4 etc)

       b) it signals the kernel driver to release the buffers containing the
       copy of microcode data actually applied to given CPU, linear array of
       2048 bytes per CPU, see struct microcode in include/asm/processor.h for
       information on the layout of chunks buffers may hold

       The microcode update is volatile and needs to be uploaded on each
       system boot i.e. it doesn't reflash your cpu permanently, reboot and it
       reverts back to the old microcode.

       -h     display usage and exit

       -i     release any buffers held in microcode driver

       -u     upload microcode (from default filename)

       -f     upload microcode from named Intel formatted file

       -q     run silently when successful

       -Q     run silently even on failure

EXAMPLE
       microcode_ctl -iu
              Upload and free kernel buffers

FILES
       /etc/microcode.dat
              The default microcode location

AUTHOR
       Microcode utility written by Simon Trimmer
       Linux Kernel driver written by Tigran Aivazian.

REPORTING BUGS
       Report bugs to either Simon Trimmer <simon@veritas.com> or Tigran
       Aivazian <tigran@veritas.com>

COPYRIGHT
       Copyright © 2000 VERITAS Software
       This is free software; see the source for copying conditions.  There is
       NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR
       PURPOSE.

SPECIAL THANKS
       Thanks to the Intel Corporation, for supplying microcode update data
       and publishing the specifications that enabled us to write microcode
       driver for Linux.

SEE ALSO
       The brave are recommended to view the driver source code located in the
       Linux Kernel source tree in arch/i386/kernel/microcode.c

       Visit http://www.urbanmyth.org/microcode/ for more information and
       microcode updates.



microcode_ctl                   17 January 2001               MICROCODE_CTL(8)