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40 lines
1.6 KiB
ReStructuredText
40 lines
1.6 KiB
ReStructuredText
.. SPDX-License-Identifier: CC-BY-SA-4.0
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.. Copyright (C) 2016 Chris Johns <chrisj@rtems.org>
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.. _targets:
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Targets
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=======
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.. index:: Targets
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*Target hardware* that can run RTEMS is often referred to simply as the
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*target* because RTEMS is specifically aimed at that target hardware. An RTEMS
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executable is statically linked and executes in a single address space on the
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target hardware. A statically linked executable means the RTEMS Kernel,
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drivers, third-party packages and application code is linked into a single
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executable image. A single address space means no virtual memory and no memory
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protected process address space is running within the RTEMS arena and the RTEMS
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executive, drivers and application have unprotected access to the whole address
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space and all hardware.
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Target hardware supported by RTEMS has a :ref:`Board Support Package <BSPs>` or
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BSP. A BSP is a specific instance of an RTEMS architecture that allows the
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creation of an RTEMS executable. You can view the layering as:
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.. comment Build image with:
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.. comment aafigure hw-layers.txt --textual --type png --option
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.. comment font=/usr/local/lib/X11/fonts/webfonts/arialbd.ttf --background
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.. comment '#dbe5c6' --scale 1.5 -o ../../images/user/hw-layers.png
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.. figure:: ../../images/user/hw-layers.png
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:align: center
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:alt: Software Layers on Hardware
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RTEMS targets are grouped by architectures and within an architecture there are
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a number of Board Support Packages or BPSs. An architecture is a specific class
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or family of processors and can be large such as ARM or specific such as the
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NIOS-II or Microblaze.
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RTEMS is designed to be ported to new target hardware easily and efficiently.
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