RAM 6.0 BUX II Series Guia do Utilizador descarregar pdf (Página 56)

VxWorks

BSP Developer’s Guide, 6.0

selected parts of the OS (such as individual tasks), without affecting the rest of

the system.

■

Because the Wind River development tools let you download and execute code

dynamically, you can download extensions and use the WDB agent to debug

the extensions. The downloadable extensions include application code, new

drivers, extra hardware initialization code, and so on.

How you download the WDB agent and the VxWorks kernel depends on your

phase of development. When writing and debugging the board initialization code,

you must create your own download path. This is no better or worse than the

traditional ROM-monitor approach, in which you must create the download path

for porting the monitor itself.

After you have the board initialization code working, how you proceed depends

on the speed of your download path. If you have a fast download path, continue

to use it for further kernel development. This is a advantage over the traditional

ROM monitor approach that often forces you to use a serial-line download path. If

you have a slow download path, you can burn the kernel into ROM, as well as the

agent and as much generic VxWorks code as fits.

2.4.3 The Wind River IDE

When porting a VxWorks BSP, it is necessary to have the VxWorks libraries that

come with a Wind River IDE installation. The IDE installation also provides header

files, a compiler and other tools, and the framework for BSP development. Also, a

BSP is not considered complete until bootable projects are tested and available.

2.4.4 Compiler and Tool Choice

When porting a BSP, there are often several choices of compilers available. At least

one compiler is always available with the Wind River IDE, and that compiler is

usually the best choice. However, there are often other choices available, either

from Wind River or from third parties.

Whichever compiler is used, it must satisfy the following requirements:

■

It must be available to all users of the BSP.

■

It must be able to read and understand the VxWorks library format and object

module format (OMF).

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