69 lines
2.0 KiB
Plaintext
69 lines
2.0 KiB
Plaintext
Title: BootTime
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Description:
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BootTime measures the time:
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a) from system reset to kernel start (crt0.s's __start)
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b) from kernel start to begin of main()
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c) from kernel start to begin of first task
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d) from kernel start to when microkernel's main task goes immediately idle
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The project can be built using one of the following three configurations:
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best
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-------
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- Disables most features
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- Provides best case boot measurement
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default
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-------
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- Default configuration options
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- Provides typical boot measurement
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worst
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-------
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- Enables most features.
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- Provides worst case boot measurement
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--------------------------------------------------------------------------------
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Building and Running Project:
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This microkernel project outputs to the console. It can be built and executed
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on QEMU in three possibile configurations as follows:
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make BOOTTIME_QUALIFIER=best qemu
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make BOOTTIME_QUALIFIER=default qemu
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make BOOTTIME_QUALIFIER=worst qemu
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--------------------------------------------------------------------------------
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Troubleshooting:
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Problems caused by out-dated project information can be addressed by
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issuing one of the following commands then rebuilding the project:
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make clean # discard results of previous builds
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# but keep existing configuration info
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or
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make pristine # discard results of previous builds
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# and restore pre-defined configuration info
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--------------------------------------------------------------------------------
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Sample Output:
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tc_start() - Boot Time Measurement
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MicroKernel Boot Result: Clock Frequency: 20 MHz
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__start : 377787 cycles, 18889 us
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_start->main(): 3915 cycles, 195 us
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_start->task : 5898 cycles, 294 us
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_start->idle : 6399 cycles, 319 us
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Boot Time Measurement finished
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===================================================================
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PASS - bootTimeTask.
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===================================================================
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PROJECT EXECUTION SUCCESSFUL
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