BSP Developer's Guide

3
Creating a New BSP
3.1 Introduction
Creating a new BSP using tools available under Tornado requires that you handle
the development in graduated steps, each building on the previous, as follows:
1. Set up the basis of the development environment.
2. Write the BSP pre-kernel initialization code.
3. Start a minimal VxWorks kernel and add the basic drivers for timers, serial
devices, and an interrupt controller.
4. Start the target agent and connect the Tornado development tools.
5. Complete the BSP. Topics include networking, boot ROMs, SCSI, caches, MMU
initialization, and DMA.
6. Generate a default project for use with the new project facility.
This chapter provides a detailed description of each of the steps listed above.
The goal of this procedure is not only the creation of a new BSP but the
minimization of the time during which you do not have access to the Tornado
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.
Using the WDB agent, you can debug the VxWorks image to which it is linked.
This is in contrast to a traditional ROM-monitor approach which requires that you
first port the monitor to the board and then port the OS.
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