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0e6ede8929
This commit renames the Kconfig `FLOAT` symbol to `FPU`, since this symbol only indicates that the hardware Floating Point Unit (FPU) is used and does not imply and/or indicate the general availability of toolchain-level floating point support (i.e. this symbol is not selected when building for an FPU-less platform that supports floating point operations through the toolchain-provided software floating point library). Moreover, given that the symbol that indicates the availability of FPU is named `CPU_HAS_FPU`, it only makes sense to use "FPU" in the name of the symbol that enables the FPU. Signed-off-by: Stephanos Ioannidis <root@stephanos.io>
.. _minimal_sample:
Minimal sample
##############
Overview
********
This sample defines An empty ``main()`` and a set of minimal configurations
that provide tests for the smallest ROM sizes possible with the Zephyr kernel.
The following configuration files are available:
* :file:`mt.conf`: Enable multithreading
* :file:`no-mt.conf`: Disable multithreading
* :file:`no-preempt.conf`: Disable preemption
* :file:`no-timers.conf`:: Disable timers
* :file:`arm.conf`: Arm-specific disabling of features
Building and measuring ROM size
*******************************
In order to compare ROM sizes with different minimal configurations, the
following combinations are suggested:
* Reel board (Arm architecture)
* Multithreading enabled
* Reference ROM size: 7-8KB
.. zephyr-app-commands::
:zephyr-app: samples/basic/minimal
:host-os: unix
:board: reel_board
:build-dir: reel_board/mt/
:conf: "common.conf mt.conf arm.conf"
:goals: rom_report
:compact:
* Multithreading enabled, no preemption
* Reference ROM size: 7-8KB
.. zephyr-app-commands::
:zephyr-app: samples/basic/minimal
:host-os: unix
:board: reel_board
:build-dir: reel_board/mt-no-preempt/
:conf: "common.conf mt.conf no-preempt.conf arm.conf"
:goals: rom_report
:compact:
* Multithreading enabled, no preemption, timers disabled
* Reference ROM size: 3-4KB
.. zephyr-app-commands::
:zephyr-app: samples/basic/minimal
:host-os: unix
:board: reel_board
:build-dir: reel_board/mt-no-preempt-no-timers/
:conf: "common.conf mt.conf no-preempt.conf no-timers.conf arm.conf"
:goals: rom_report
:compact:
* Multithreading disabled, timers enabled
* Reference ROM size: 4-5KB
.. zephyr-app-commands::
:zephyr-app: samples/basic/minimal
:host-os: unix
:board: reel_board
:build-dir: reel_board/no-mt/
:conf: "common.conf no-mt.conf arm.conf"
:goals: rom_report
:compact:
* Multithreading disabled, timers disabled
* Reference ROM size: 2-3KB
.. zephyr-app-commands::
:zephyr-app: samples/basic/minimal
:host-os: unix
:board: reel_board
:build-dir: reel_board/no-mt-no-timers/
:conf: "common.conf no-mt.conf no-timers.conf arm.conf"
:goals: rom_report
:compact: