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RedHat 9 (Linux i386) - man page for microcode_ctl (redhat section 8)

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@veri-
       tas.com>

COPYRIGHT
       Copyright (C) 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)


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