microcode_ctl (8) - Linux Manuals
microcode_ctl: microcode utility for Intel IA32 processors
NAMEmicrocode_ctl - microcode utility for Intel IA32 processors
SYNOPSISmicrocode_ctl [-h] [-u [-q]] [-Q] [-f microcode]
The microcode_ctl utility is a companion to the IA32 microcode driver written
by Tigran Aivazian <tigran [at] aivazian.fsnet.co.uk>. 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.
- display usage and exit
- upload microcode (from default filename)
- upload microcode from named Intel formatted file
- run silently when successful
- run silently even on failure
- microcode_ctl -u
- Upload microcode using defaults
- The default microcode location
AUTHORMicrocode utility written by Simon Trimmer
Linux Kernel driver written by Tigran Aivazian.
REPORTING BUGSReport bugs to either Simon Trimmer <simon [at] urbanmyth.org> or Tigran Aivazian <tigran [at] aivazian.fsnet.co.uk>
COPYRIGHTCopyright © 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 THANKSThanks to the Intel Corporation, for supplying microcode update data and publishing the specifications that enabled us to write microcode driver for Linux.
SEE ALSOThe 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.