BSP Developer's Guide

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VxWorks 5.5 BSP Developer’s Guide The combination of copyback cache without snooping is particularly dangerous, although the risk is reduced if all user buffers are positioned so that they do not share cache lines with any other buffer. The user can insure that the front end of any user buffer is aligned on a cache boundary by setting the variable memDefaultAlignment to the cache line size. This results in all malloc( ) requests being aligned on the start of a cache line. The user can protect the rear end of any buffer by increasing the size of the memory request by one cache line. This guarantees that no other buffer shares a cache line with this buffer. Having done all this, memory buffers for DMA operations are relatively safe from the effect of memory coherency in a copyback situation. Many new processors implement write pipes that can buffer write operations when the bus controller is busy. This requires device drivers to make use of the CACHE_PIPE_FLUSH macros for generic drivers. A CACHE_PIPE_FLUSH operation should be inserted between any I/O write operation and a I/O read operation. If a routine begins with an I/O read then you should assume that an I/O write operation precedes it. 4.2.3 MMU Support VxWorks supports several different MMUs through a virtual memory library. Because virtual memory is inappropriate for some real-time applications, VxWorks can be configured to not include virtual memory support. For more information on VxWorks virtual memory support, see the following: ■ the reference entries for vmBaseLib and vmLib ■ ■ VxWorks Programmer’s Guide: Virtual Memory Interface VxWorks Programmer’s Guide: Configuration ■ 4.5 Enabling the Virtual Memory Library, p.83 4.2.4 Floating-Point Support Floating point is supported as a tasking extension to avoid costly context switch times for tasks that do not use floating-point operations. Tasks can be spawned with a special floating-point option, and context switch callouts provide the mechanism to initialize, save, and restore a floating-point context. By switching floating-point data and control registers in and out, each task effectively shares the single floating-point unit. 66
4 Hardware Guidelines Higher-level transcendental functions are supported in VxWorks in one of these ways: ■ ■ A portable version that avoids using any floating-point instructions is standard, but can be replaced with an optimized (assembly language) version for certain architectures with floating-point capabilities. See the discussion of the selection of optional features in the VxWorks Programmer’s Guide: Configuration. For floating-point intensive applications, coprocessors offer significant performance advantages. 4 4.2.5 Other Issues Other features worth consideration include the following: ■ ■ ■ The endian byte order selection is transparent to full VxWorks functionality. An architecture with indivisible read-modify-write operation, such as test-and-set, is necessary for high-performance backplane network communication. Restrict non-maskable interrupts to events that require no operating system support. 4.3 Memory This section discusses the following issues: ■ ■ ■ ■ ■ ■ RAM ROM Ethernet RAM NVRAM parity checking addressing 67
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VxWorks® 5.5 BSP DEVELOPER’S GUI
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1 Overview ........................
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Contents 1 Overview ...............
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Contents 3.6.5 Cache, MMU, and DMA
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Contents Memory-Mapped Chips ......
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Contents 7.3.3 System Configuration
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Contents 9.5.4 Processing .........
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Contents F Generic Drivers ........
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Contents Stopping the Driver Withou
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1 Overview 1.1 Introduction One str
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1 Overview ■ New Drivers Many new
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1 Overview Included with Tornado (n
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1 Overview ■ ■ ■ ■ ■ ■
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1 Overview Table 1-1 Font Usage for
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2 BSP Organization 2.1 Introduction
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2 BSP Organization Files in the tar
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Page 129 and 130: 6 Components 6.1 Introduction Torna
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6 Components Folder FOLDER_ANSI { N
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6 Components in a single project. I
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6 Components The component object i
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6 Components Parameters Parameters
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6 Components In the example, the co
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6 Components (2) comps/vxWorks/arch
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6 Components Figure 6-4 Include Com
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6 Components NOTE: INIT_BEFORE only
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6 Components The _CHILDREN property
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6 Components ! CAUTION: Do not alte
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6 Components ■ Check the Project
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7 Validation Testing 7.1 Introducti
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7 Validation Testing ■ ■ The te
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7 Validation Testing 2. The script
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7 Validation Testing Figure 7-4 Typ
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7 Validation Testing NOTE: Wind Riv
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7 Validation Testing scsi Requires
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7 Validation Testing Table 7-1 Vali
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7 Validation Testing Table 7-2 Vali
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7 Validation Testing sysProcNumGet
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7 Validation Testing The log file c
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8 Writing Portable C Code This chap
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8 Writing Portable C Code attribute
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8 Writing Portable C Code 8.1.3 Sta
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8 Writing Portable C Code 8.1.5 Oth
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8 Writing Portable C Code The last
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8 Writing Portable C Code Always sp
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8 Writing Portable C Code 8.2 Tool
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9 Documentation Guidelines 9.1 Intr
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9 Documentation Guidelines Spelling
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9 Documentation Guidelines Table 9-
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9 Documentation Guidelines Table 9-
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9 Documentation Guidelines ■ Avoi
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9 Documentation Guidelines ■ ■
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9 Documentation Guidelines INCLUDE
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9 Documentation Guidelines INTRODUC
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9 Documentation Guidelines 9.5 Gene
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9 Documentation Guidelines uppercas
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9 Documentation Guidelines The foll
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10 Product Packaging 10.1 SETUP Dev
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10 Product Packaging ... include $(
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10 Product Packaging Vendor-Supplie
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10 Product Packaging in the project
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A Upgrading a BSP for Tornado 2.0 T
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A Upgrading a BSP for Tornado 2.0 A
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A Upgrading a BSP for Tornado 2.0
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A Upgrading a BSP for Tornado 2.0 6
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B Upgrading a BSP for Tornado 2.2 T
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B Upgrading a BSP for Tornado 2.2 C
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B Upgrading a BSP for Tornado 2.2
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B Upgrading a BSP for Tornado 2.2 c
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B Upgrading a BSP for Tornado 2.2
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C Upgrading a BSP for the VxWorks N
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D VxWorks Boot Sequence Table D-1 d
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D VxWorks Boot Sequence Table D-1 V
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E Component Language E.1 Component
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E Component Language REQUIRES r1 r2
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E Component Language } // default i
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E Component Language FOLDER_WINDVIE
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E Component Language initialization
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E Component Language INCLUDE_MMU_BA
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E Component Language INCLUDE_NETWOR
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E Component Language INCLUDE_WDB_ME
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F Generic Drivers F.1 Introduction
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F Generic Drivers CONSOLE_TTY This
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F Generic Drivers Define SIO_CALLBA
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F Generic Drivers NV_RAM_SIZE Defin
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F Generic Drivers F.10 PCI Bus The
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G Upgrading 4.3 BSD Network Drivers
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H Implementing a MUX-Based Network
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I Writing a SCSI-2 Device Driver I.
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I Writing a SCSI-2 Device Driver SC
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I Writing a SCSI-2 Device Driver Fo
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I Writing a SCSI-2 Device Driver On
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I Writing a SCSI-2 Device Driver A
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I Writing a SCSI-2 Device Driver /*
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I Writing a SCSI-2 Device Driver */
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I Writing a SCSI-2 Device Driver *
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I Writing a SCSI-2 Device Driver #i
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I Writing a SCSI-2 Device Driver ;/
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J BSP Validation Test Suite Referen
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K BSP Validation Checklists This ap
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K BSP Validation Checklists BSP Val
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K BSP Validation Checklists 7. Veri
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K BSP Validation Checklists 2. If t
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K BSP Validation Checklists Validat
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K BSP Validation Checklists Manufac
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K BSP Validation Checklists Manufac
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L Refgen NOTE: In Tornado 1.0.1 and
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L Refgen * SYNOPSIS * \cs * void xx
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L Refgen Yields output approximatel
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L Refgen EXAMPLE INCLUDES SEE ALSO
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M BSP Product Contents When you are
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M BSP Product Contents Do not inclu
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Index A abort button 82 addressing
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Index clocks see also individual cl
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Index naming conventions 95 perform
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Index INCLUDE_USR_APPL 38 INCLUDE_V
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Index network drivers 58 network in
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Index scsiCtrlLib 324 scsiDirectLib
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Index testing, validation 139-158 s
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