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VxWorks

BSP Developer’s Guide, 6.0

bootrom_uncmp

A VxWorks image with a boot loader application that is programmed into

flash. This image copies itself into RAM for execution. This image requires a

large amount of both RAM and ROM but executes quickly.

bootrom_res

A VxWorks image with a boot loader application that is programmed into

flash. This image copies its data segment into RAM for execution, but

continues fetching instructions from flash. This image requires a large ROMN

space and little RAM space.

bootrom_res_high

A VxWorks image with a boot loader application that is programmed into

flash. This image copies its data segment into RAM for execution, but

continues fetching instructions from flash. This image loads the VxWorks

image into a higher location in RAM.

In the information presented above, references are made to bootrom, which is a

VxWorks image configured with a boot loader as its application. While this is

typically how the image is loaded during development, and in released products

as well, it is also possible for VxWorks to be loaded by an external agent of some

kind. For example, the image can be loaded by a boot loader not based on

VxWorks, such as a ROM monitor, or the image can be loaded directly into RAM

by a hardware debugger such as the Wind River ICE. For more information, see

2.4 The Development Environment, p.43. Also consult the documents listed in

1. Introduction.

2.2.3 Architecture Considerations

The VxWorks BSP design was developed to be architecture-independent.

However, many architectures and boards have special requirements. This section

briefly discusses some of these special considerations. This discussion is not

intended to be complete or comprehensive, but is intended to give an idea of the

kinds of customizations that may affect a BSP port.

NOTE: The architectures discussed in this section are examples only. Your

VxWorks installation may not include support for all architectures described here.

For a list of supported architectures, see the Wind River Online Support Web site

or your product’s release notes. In addition, architectures not discussed in this

section may have special BSP requirements as well. For more information

regarding your target architecture, see the appropriate VxWorks Architecture

Supplement.

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