[coreboot] Patch merged into coreboot/master: 6d18fd0 Utility to dump boot timing table

[gerrit at coreboot.org]

the following patch was just integrated into master:
commit 6d18fd09c380d6195999c69ffa29310c4429f4f1
Author: Vadim Bendebury <vbendeb at chromium.org>
Date:   Thu Sep 27 19:24:07 2012 -0700

    Utility to dump boot timing table
    
    Coreboot and u-boot create a table of timestamps which allows to see
    the boot process performance. The util/cbmem/cbmem.py script allows to
    access the table after ChromeOS boots up and display its contents on
    the console. The problem is that shipping images do not include Python
    interpreter, so there is no way to access the table on a production
    machine.
    
    This change introduces a utility which is a Linux app displaying the
    timestamp table. Conceivably the output of this utility might be
    included in one of the ChromeOS :/system sections, so it was attempted
    to write this procedure 'fail safe', namely reporting errors and not
    continuing processing if something goes wrong.
    
    Including of coreboot/src .h files will allow to keep the firmware
    timestamp implementation and this utility in sync in the future.
    
    Test:
        . build the utility (run 'make' while in chroot in  util/cbmem)
        . copy `cbmem' and 'cbmem.py' to the target
        . run both utilities (limiting cbmem.py output to 25 lines or so)
        . observe that the generated tables are identical (modulo rounding
          up of int division, resulting in 1 ns discrepancies in some
          cases)
    
          localhost var # ./cbmem
          18 entries total:
    
             1:62,080
             2:64,569 (2,489)
             3:82,520 (17,951)
             4:82,695 (174)
             8:84,384 (1,688)
             9:131,731 (47,347)
            10:131,821 (89)
            30:131,849 (27)
            40:132,618 (769)
            50:134,594 (1,975)
            60:134,729 (134)
            70:363,440 (228,710)
            75:363,453 (13)
            80:368,165 (4,711)
            90:370,018 (1,852)
            99:488,217 (118,199)
          1000:491,324 (3,107)
          1100:760,475 (269,150)
    
          localhost var # ./cbmem.py | head -25
    
          time base 4249800, total entries 18
          1:62,080
          2:64,569  (2,489)
          3:82,520  (17,951)
          4:82,695  (174)
          8:84,384  (1,688)
          9:131,731  (47,347)
          10:131,821  (89)
          30:131,849  (27)
          40:132,618  (769)
          50:134,594  (1,975)
          60:134,729  (134)
          70:363,440  (228,710)
          75:363,453  (13)
          80:368,165  (4,711)
          90:370,018  (1,852)
          99:488,217  (118,199)
          1000:491,324  (3,107)
          1100:760,475  (269,150)
    
    Change-Id: I013e594d4afe323106d88e7938dd40b17760621c
    Signed-off-by: Vadim Bendebury <vbendeb at chromium.org>
    Reviewed-on: http://review.coreboot.org/1759
    Tested-by: build bot (Jenkins)
    Reviewed-by: Stefan Reinauer <stefan.reinauer at coreboot.org>

Build-Tested: build bot (Jenkins) at Sun Nov 11 21:14:27 2012, giving +1
Reviewed-By: Stefan Reinauer <stefan.reinauer at coreboot.org> at Mon Nov 12 03:35:19 2012, giving +2
See http://review.coreboot.org/1759 for details.

-gerrit