mirror of
https://github.com/zephyrproject-rtos/zephyr
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407b49b35c
Using find_package to locate Zephyr.
Old behavior was to use $ENV{ZEPHYR_BASE} for inclusion of boiler plate
code.
Whenever an automatic run of CMake happend by the build system / IDE
then it was required that ZEPHYR_BASE was defined.
Using ZEPHYR_BASE only to locate the Zephyr package allows CMake to
cache the base variable and thus allowing subsequent invocation even
if ZEPHYR_BASE is not set in the environment.
It also removes the risk of strange build results if a user switchs
between different Zephyr based project folders and forgetting to reset
ZEPHYR_BASE before running ninja / make.
Signed-off-by: Torsten Rasmussen <Torsten.Rasmussen@nordicsemi.no>
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| .. | ||
| src | ||
| CMakeLists.txt | ||
| prj.conf | ||
| README.txt | ||
| testcase.yaml | ||
Title: Boot Time Measurement
Description:
BootTime measures the time:
a) from system reset to kernel start (crt0.s's __start)
b) from kernel start to begin of main()
c) from kernel start to begin of first task
d) from kernel start to when kernel's main task goes immediately idle
The project can be built using one of the following three configurations:
best
-------
- Disables most features
- Provides best case boot measurement
default
-------
- Default configuration options
- Provides typical boot measurement
worst
-------
- Enables most features.
- Provides worst case boot measurement
--------------------------------------------------------------------------------
Building and Running Project:
This benchmark outputs to the console. It can be built and executed
on QEMU as follows:
make run
--------------------------------------------------------------------------------
Troubleshooting:
Problems caused by out-dated project information can be addressed by
issuing one of the following commands then rebuilding the project:
make clean # discard results of previous builds
# but keep existing configuration info
or
make pristine # discard results of previous builds
# and restore pre-defined configuration info
--------------------------------------------------------------------------------
Sample Output:
tc_start() - Boot Time Measurement
Boot Result: Clock Frequency: 25 MHz
__start : 88410717 cycles, 3536428 us
_start->main(): 2422894 cycles, 96915 us
_start->task : 2450930 cycles, 98037 us
_start->idle : 37503993 cycles, 1500159 us
Boot Time Measurement finished
===================================================================
PASS - main.
===================================================================
PROJECT EXECUTION SUCCESSFUL