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       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 <tigran@veri­
       tas.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 per­
       manently, 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


       microcode_ctl -iu
              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 <simon@veritas.com> or
       Tigran Aivazian <tigran@veritas.com>


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

microcode_ctl            17 January 2001         MICROCODE_CTL(8)
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