RAM 6.0 BUX II Series Betriebsanweisung PDF herunterladen (Seite 64)

VxWorks

BSP Developer’s Guide, 6.0

5. Complete the BSP. This can include adding support for busses, networking,

boot ROMs, SCSI, caches, MMU initialization, and direct memory access

(DMA).

6. Generate a default project for use with the project facility.

The goal of this procedure is not only to create a new BSP, but also to minimize the

time during which you do not have access to the Wind River development tools—

in particular, the Wind Debug target agent (WDB agent). Because the WDB agent

is linked to the kernel, it can share initialization code with the kernel. Thus, after

the initialization code has run, you can start either the WDB agent, the VxWorks

kernel, or both.

3.2 Getting a Minimal Kernel Running

During the initial phases of BSP development, command-line tools are used to

build the code. No Wind River tools are available. A good early step in the

development process is to write simple code that helps to verify that the CPU is

working, making later debugging easier.

Your initial strategy might be to create a BSP directory and add the minimum

required files. This includes the files specified in 2.3.1 Source and Include Files, p.21.

You must also ensure that there are stubs for each of the routines described in

2.3.4 Required Routines, p.32.

Next, build your VxWorks image and verify that it contains the expected code at

the proper locations. For more information on what can be done at this stage of the

process, see 4. Debugging Your BSP. All of these steps can be done before hardware

is available.

3.2.1 Initializing the Board

The first task that the BSP must accomplish is to initialize the board’s registers to

the point that the processor executes instructions correctly. Typically, some of this

initialization is handled by the target hardware at power-up time. For example, as

specified in 2.2.3 Architecture Considerations, p.14, MIPS processors use a modeIn

pin to set the initial values of some processor registers. Other registers must be set

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RAM 6.0 BUX II Series Betriebsanweisung Seite 64