92 lines
2.4 KiB
ReStructuredText
92 lines
2.4 KiB
ReStructuredText
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.. _minimal_sample:
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Minimal sample
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##############
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Overview
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********
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This sample defines An empty ``main()`` and a set of minimal configurations
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that provide tests for the smallest ROM sizes possible with the Zephyr kernel.
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The following configuration files are available:
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* :file:`mt.conf`: Enable multithreading
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* :file:`no-mt.conf`: Disable multithreading
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* :file:`no-preempt.conf`: Disable preemption
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* :file:`no-timers.conf`:: Disable timers
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* :file:`arm.conf`: Arm-specific disabling of features
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Building and measuring ROM size
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*******************************
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In order to compare ROM sizes with different minimal configurations, the
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following combinations are suggested:
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* Reel board (Arm architecture)
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* Multithreading enabled
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* Reference ROM size: 7-8KB
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.. zephyr-app-commands::
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:zephyr-app: samples/basic/minimal
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:host-os: unix
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:board: reel_board
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:build-dir: reel_board/mt/
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:conf: "common.conf mt.conf arm.conf"
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:goals: rom_report
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:compact:
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* Multithreading enabled, no preemption
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* Reference ROM size: 7-8KB
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.. zephyr-app-commands::
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:zephyr-app: samples/basic/minimal
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:host-os: unix
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:board: reel_board
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:build-dir: reel_board/mt-no-preempt/
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:conf: "common.conf mt.conf no-preempt.conf arm.conf"
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:goals: rom_report
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:compact:
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* Multithreading enabled, no preemption, timers disabled
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* Reference ROM size: 3-4KB
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.. zephyr-app-commands::
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:zephyr-app: samples/basic/minimal
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:host-os: unix
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:board: reel_board
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:build-dir: reel_board/mt-no-preempt-no-timers/
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:conf: "common.conf mt.conf no-preempt.conf no-timers.conf arm.conf"
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:goals: rom_report
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:compact:
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* Multithreading disabled, timers enabled
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* Reference ROM size: 4-5KB
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.. zephyr-app-commands::
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:zephyr-app: samples/basic/minimal
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:host-os: unix
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:board: reel_board
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:build-dir: reel_board/no-mt/
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:conf: "common.conf no-mt.conf arm.conf"
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:goals: rom_report
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:compact:
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* Multithreading disabled, timers disabled
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* Reference ROM size: 2-3KB
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.. zephyr-app-commands::
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:zephyr-app: samples/basic/minimal
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:host-os: unix
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:board: reel_board
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:build-dir: reel_board/no-mt-no-timers/
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:conf: "common.conf no-mt.conf no-timers.conf arm.conf"
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:goals: rom_report
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:compact:
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