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41 lines
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ReStructuredText
41 lines
1.7 KiB
ReStructuredText
.. comment SPDX-License-Identifier: CC-BY-SA-4.0
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.. comment: Copyright (c) 2016 Chris Johns <chrisj@rtems.org>
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.. comment: All rights reserved.
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.. _targets:
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Targets
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=======
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.. index:: Targets
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Hardware that can run RTEMS is often referred to as a *target* because RTEMS is
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specifically aimed at that hardware or target. An RTEMS executable is
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statically linked and executes in a single address space on the target
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hardware. A statically linked executable means the RTEMS Kernel, drivers, third
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party packages and application code is linked into a single executable image. A
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single address space means no virtual memory and no memory protected process
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address space is running within the RTEMS arena and the RTEMS Kernel, drivers
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and application have unprotected access to the whole address space and all
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hardware.
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Target hardware supported by RTEMS has a Board Support Package or BSP. A BSP is
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a specific instance of an RTEMS architecture that allows the creation of an
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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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