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3. Processor and Architecture Support

A bank of software controlled LEDs is also a desirable feature for the board. During

development, they can indicate the state of the system relevant to the application

being developed. And for product deployment, they can indicate system status.

For more effective debugging, it is helpful to have a high resolution timer other

than the system clock, to be configured as a timestamp device. It is also usually

appropriate to include support for an auxiliary clock.

Note that it is also not absolutely required that the system have an MMU.

However, in cases where no MMU is present, some system capabilities are not

available, such as write protection of the text segment and the use of sentinel pages

to help protect the task stacks and other important data structures. When an MMU

is available on a processor, it must be used.

3. Processor and Architecture Support

VxWorks supports a variety of processor architectures and many specific

processors. A list of standard board support packages (BSPs) is available from the

Wind River Web site at:

http://www.windriver.com/products/bsp_web/bsp_architecture.html

One of these BSPs can be used as a reference when developing your own BSP. For

VxWorks to be used as the OS for your project, it is helpful to design the hardware

similar to the hardware used by one of the BSPs from these pages.

In addition, it is possible to get a list of processors supported by VxWorks from the

Wind River Online Support Web site.

Care should be taken to insure that the processor has the functionality that is

required and that VxWorks libraries support that functionality on that processor.

Many chips are designed without certain features, or with reduced capabilities for

some features. Even if the processor is supported, this can make them less

desirable with VxWorks libraries in some respects. For more information, see

10. Partial Compliance to Standards, p.31.

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RAM 6.0 BUX II Series Guía de usuario Pagina 7