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54 lines
1.8 KiB
Perl
54 lines
1.8 KiB
Perl
@c
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@c COPYRIGHT (c) 1988-2002.
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@c On-Line Applications Research Corporation (OAR).
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@c All rights reserved.
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@c
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@c $Id$
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@c
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@chapter Board Support Packages
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@section Introduction
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An RTEMS Board Support Package (BSP) must be designed
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to support a particular processor and target board combination.
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This chapter presents a discussion of PA-RISC specific BSP
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issues. For more information on developing a BSP, refer to the
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chapter titled Board Support Packages in the RTEMS
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Applications User's Guide.
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@section System Reset
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An RTEMS based application is initiated or
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re-initiated when the PA-RISC processor is reset. The behavior
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of a PA-RISC upon reset is implementation defined and thus is
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beyond the scope of this manual.
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@section Processor Initialization
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The precise requirements for initialization of a
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particular implementation of the PA-RISC architecture are
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implementation defined. Thus it is impossible to provide exact
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details of this procedure in this manual. However, the
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requirements of RTEMS which must be satisfied by this
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initialization code can be discussed.
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RTEMS assumes that interrupts are disabled when the
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initialize_executive directive is invoked. Interrupts are
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enabled automatically by RTEMS as part of the initialize
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executive directive and device driver initialization occurs
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after interrupts are enabled. Thus all interrupt sources should
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be quiescent until the system's device drivers have been
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initialized and installed their interrupt handlers.
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If the processor requires initialization of the
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cache, then it should be be done during the reset application
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initialization code.
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Finally, the requirements in the Board Support
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Packages chapter of the Applications User's Manual for the
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reset code which is executed before the call to initialize
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executive must be satisfied.
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