diff options
| author | Simon Glass | 2012-02-13 13:51:19 +0000 |
|---|---|---|
| committer | Wolfgang Denk | 2012-03-18 21:42:14 +0100 |
| commit | 3a608ca01d76e8cb90dcc8dc1a22cde98cdca3ab (patch) | |
| tree | e00bc2156e8ed15bcb5de0ee76826dac024ac302 /README | |
| parent | 770605e4f9874230728f5a592820c619b1565ebc (diff) | |
bootstage: Implement core microsecond boot time measurement
This defines the basics of a new boot time measurement feature. This allows
logging of very accurate time measurements as the boot proceeds, by using
an available microsecond counter.
To enable the feature, define CONFIG_BOOTSTAGE in your board config file.
Also available is CONFIG_BOOTSTAGE_REPORT which will cause a report to be
printed just before handing off to the OS.
Most IDs are not named at this stage. For that I would first like to
renumber them all.
Timer summary in microseconds:
Mark Elapsed Stage
0 0 reset
205,000 205,000 board_init_f
6,053,000 5,848,000 bootm_start
6,053,000 0 id=1
6,058,000 5,000 id=101
6,058,000 0 id=100
6,061,000 3,000 id=103
6,064,000 3,000 id=104
6,093,000 29,000 id=107
6,093,000 0 id=106
6,093,000 0 id=105
6,093,000 0 id=108
7,089,000 996,000 id=7
7,089,000 0 id=15
7,089,000 0 id=8
7,097,000 8,000 start_kernel
Signed-off-by: Simon Glass <sjg@chromium.org>
Diffstat (limited to 'README')
| -rw-r--r-- | README | 25 |
1 files changed, 25 insertions, 0 deletions
@@ -2261,6 +2261,31 @@ The following options need to be configured: example, some LED's) on your board. At the moment, the following checkpoints are implemented: +- Detailed boot stage timing + CONFIG_BOOTSTAGE + Define this option to get detailed timing of each stage + of the boot process. + + CONFIG_BOOTSTAGE_USER_COUNT + This is the number of available user bootstage records. + Each time you call bootstage_mark(BOOTSTAGE_ID_ALLOC, ...) + a new ID will be allocated from this stash. If you exceed + the limit, recording will stop. + + CONFIG_BOOTSTAGE_REPORT + Define this to print a report before boot, similar to this: + + Timer summary in microseconds: + Mark Elapsed Stage + 0 0 reset + 3,575,678 3,575,678 board_init_f start + 3,575,695 17 arch_cpu_init A9 + 3,575,777 82 arch_cpu_init done + 3,659,598 83,821 board_init_r start + 3,910,375 250,777 main_loop + 29,916,167 26,005,792 bootm_start + 30,361,327 445,160 start_kernel + Legacy uImage format: Arg Where When |