RAM 6.0 BUX II Series Guía de usuario descargar pdf (Pagina 144)

VxWorks

BSP Developer’s Guide, 6.0

136

However, there are several reasons why this is not good programming practice. In

many modern processors, the physical address space has grown from 32 bits to a

larger number such as 36 bits or even 64 bits. However, because VxWorks is still

essentially a 32-bit operating system, the virtual address is limited to 32 bits. This

means that drivers written without regard to the difference between virtual and

physical memory cannot be used on these systems.

In addition, with the introduction of real-time processes (RTPs) in VxWorks 6.0,

there is no longer a flat memory model. For drivers to work correctly with

VxWorks 6.0, the driver must be aware of the difference between physical and

virtual memory, and call the appropriate macros to convert the addresses at

appropriate times.

For more information, see the VxWorks Device Driver Developer’s Guide.

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RAM 6.0 BUX II Series Guía de usuario Pagina 144