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microcode_ctl - microcode utility for Intel IA32 processors
microcode_ctl [-h] [-i] [-u [-q]] [-Q] [-f microcode]
The microcode_ctl utility is a companion to the IA32 microcode driver written by Tigran
Aivazian <firstname.lastname@example.org>. 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
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
Upload and free kernel buffers
The default microcode location
Microcode utility written by Simon Trimmer
Linux Kernel driver written by Tigran Aivazian.
Report bugs to either Simon Trimmer <email@example.com> or Tigran Aivazian <tigran@veri-
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.
Thanks to the Intel Corporation, for supplying microcode update data and publishing the
specifications that enabled us to write microcode driver for Linux.
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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