Digi Connect SP User guide

NET+OS with Green Hills

BSP Porting Guide

Operating system/version: 6.2

Part number/version: 90000693_B

Release date: March 2006

www.digi.com

NET+Works with Green Hills

Tools BSP Porting Guide

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of the publication.

Contents

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Chapter 1: Introduction ....................................................................... 1

Overview .................................................................................. 2

Application development............................................................... 2

What is the board support package?.................................................. 3

Why does the target BSP need to change from the

NET+ARM development board BSP? ............................................ 3

What are the benefits of following the NET+ARM reference design? ..... 4

What’s the best way to add my target hardware BSP platform? .......... 4

NET+OS tree structure .................................................................. 5

bsp .................................................................................. 6

examples ........................................................................... 6

bin................................................................................... 6

h ..................................................................................... 7

ghssrc ............................................................................... 7

smicng .............................................................................. 8

arm7 ................................................................................ 8

arm9 ................................................................................ 8

debugger_ files.................................................................... 8

docs ................................................................................. 8

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Chapter 2: NET+OS BSP for ARM7 ............................................... 9

Overview ................................................................................. 10

Platforms................................................................................. 10

Initialization ............................................................................. 11

Initializing hardware ............................................................ 11

Initialization sequence.......................................................... 11

C library startup ................................................................. 11

NABoardInit ....................................................................... 12

ROM bootloader .................................................................. 12

BSP tree structure ...................................................................... 13

Top-level directory .............................................................. 13

bootloader subdirectory ........................................................ 13

devices directory ................................................................ 14

platforms directory.............................................................. 14

Customizing the BSP for application hardware .................................... 15

Follow the reference design ................................................... 16

Verify the features your hardware supports................................. 16

Task 1: Purchase and assign Ethernet MAC addresses...................... 16

Task 2: Create a new platform subdirectory ................................ 17

Task 3: Build and modify the BSP build file ................................. 17

Task 4: Modify the linker scripts .............................................. 17

Task 5: Modify BSP configuration files........................................ 19

Task 6: Modify the new BSP to start up the required drivers ............. 23

Task 7: Modify the format of BSP arguments in NVRAM ................... 24

Task 8: Modify error and exception handlers................................ 25

Task 9: Verify the debugger initialization files ............................. 26

Task 10: Debug the initialization code ....................................... 28

Task 11: Modify the startup dialog............................................ 31

Task 12: Modify the POST ...................................................... 31

Task 13: Modify the ACE ........................................................ 32

Other BSP customizing ................................................................. 32

BSP_NVRAM_DRIVER ............................................................. 33

TCP/IP stack ...................................................................... 33

File system........................................................................ 34

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Chapter 3: NET+OS BSP for ARM9 ............................................. 37

Overview ................................................................................. 38

Supported platforms ................................................................... 38

Initialization ............................................................................. 38

Initializing hardware ............................................................ 38

Initialization sequence.......................................................... 39

C library startup ................................................................. 40

NABoardInit ....................................................................... 40

ROM bootloader ......................................................................... 40

BSP tree structure ...................................................................... 41

Top-level directory .............................................................. 41

bootloader subdirectory ........................................................ 41

devices directory ................................................................ 42

platforms directory.............................................................. 43

Customizing the BSP for application hardware .................................... 43

Follow the reference design ................................................... 44

Verify the features your hardware supports................................. 44

Task 1: Purchase and assign Ethernet MAC addresses...................... 45

Task 2: Create a new platform subdirectory ................................ 45

Task 3: Add your platform to the central build system.................... 45

Task 4: Modify the linker scripts .............................................. 45

Task 5: Modify BSP configuration files........................................ 47

Task 6: Modify the new BSP to start up the required drivers ............. 53

Task 7: Modify the format of BSP arguments in NVRAM ................... 56

Task 8: Modify error and exception handlers................................ 57

Task 9: Verify the debugger initialization files ............................. 58

Task 10: Debug the initialization code ....................................... 59

Task 11: Modify the startup dialog............................................ 62

Task 12: Modify the POST ...................................................... 63

Task 13: Modify the ACE ........................................................ 63

Other BSP customizing ................................................................. 64

BSP_NVRAM_DRIVER ............................................................. 64

TCP/IP stack ...................................................................... 64

File system........................................................................ 66

viii       

Chapter 4: Linker Files ....................................................................... 69

Overview ................................................................................. 70

Linker files provided for sample projects........................................... 70

Basic Green Hills section of the linker files ................................. 71

NET+OS section of the linker files............................................. 71

Address mapping (ARM9 only) ........................................................ 72

NET+OS memory map (ARM9 only) ............................................ 74

Memory aliasing in NET+OS (ARM7 only) ............................................ 75

Chapter 5:

Adding Flash .................................................................... 77

Overview ................................................................................. 78

Flash table data structure...................................................... 78

Adding new flash........................................................................ 80

Supporting larger flash.......................................................... 81

Chapter 6:

Device Drivers ................................................................ 83

Overview ................................................................................. 84

Adding devices .......................................................................... 84

deviceInfo structure............................................................. 84

Device driver functions ......................................................... 85

Return values............................................................................ 95

NET+OS device drivers .......................................................... 97

Device driver interface ......................................................... 98

Chapter 7:

Hardware Dependencies

for ARM7-based Platforms

...................................... 99

Overview ................................................................................100

DMA channels...........................................................................100

Ethernet PHY ...........................................................................101

ENI controller ..........................................................................101

Serial ports .............................................................................101

Software watchdog ....................................................................102

Big Endian mode .......................................................................102

       ix

System clock............................................................................102

BSP_CLOCK_SOURCE............................................................102

XTAL1_FREQUENCY .............................................................103

CRYSTAL_OSCILLATOR_FREQUENCY..........................................103

PLL Control Register setting ..................................................103

System timers ..........................................................................104

Timer 1 ...........................................................................104

Timer 2 ...........................................................................104

Interrupts ...............................................................................104

Memory map............................................................................105

Chapter 8:

Hardware Dependencies

for ARM9-based Platforms

.................................... 107

Overview ................................................................................108

DMA channels...........................................................................108

Ethernet PHY ...........................................................................108

Endianness ..............................................................................109

General purpose timers...............................................................109

System timers ...................................................................109

All other general purpose timers .............................................110

Interrupts ...............................................................................110

System clock............................................................................111

Chip selects.............................................................................111

Memory map............................................................................112

Chapter 9:

Porting NET+OS v6.0 Applications

to NET+OS v6.2

.......................................................... 113

Overview ................................................................................114

BSP build file ...........................................................................114

Application build files.................................................................114

Linker scripts ...........................................................................115

Bootloader files ........................................................................115

Cache API ...............................................................................115

Embedded Networking Interface ....................................................116

x       

ISR API ...................................................................................116

RAM API .................................................................................116

Real Time Clock driver................................................................116

SYSCLK API ..............................................................................117

GPIO configuration ....................................................................117

SPI API ...................................................................................118

Stack sizes for exception handlers..................................................118

Interrupt priorities ....................................................................118

Chapter 10:

Porting NET+OS v6.1 Applications to

NET+OS v6.2

.............................................................. 119

Overview ................................................................................120

BSP build file ...........................................................................120

Application build files.................................................................120

Linker scripts ...........................................................................121

Bootloader files ........................................................................121

Client parallel driver ..................................................................121

I2C driver ...............................................................................122

Interrupt Service Routine (ISR) API .................................................122

MMU API .................................................................................123

PLL functions ...........................................................................123

Real time clock driver ................................................................124

GPIO configuration ....................................................................124

Timer driver ............................................................................124

SPI API ...................................................................................125

Network heap caching ................................................................125

USB host API ............................................................................125

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Appendix A: Using Central Build .......................................129

Overview ................................................................................130

Design.............................................................................130

Structure .........................................................................130

Building with ns9360_a.gpj ..........................................................134

Building a single application ..................................................134

Adding a new application......................................................135

Adding a custom BSP ...........................................................137

Setting options .........................................................................139

Platform..........................................................................140

CPU type .........................................................................140

Endianness .......................................................................140

Warnings .........................................................................140

Optimization.....................................................................140

Debug .............................................................................141

Define flags ......................................................................141

Build option macros ............................................................141

Adding paths.....................................................................142

Directory path...................................................................142

File hooks ........................................................................143

Appendix B: Customizing the SPI Bootloade

r ....................... 145

Overview ................................................................................146

SPI bootloader application images ..................................................147

ROM image .......................................................................147

RAM image .......................................................................147

Application image structure .........................................................148

Application image header .....................................................148

boothdr utility...................................................................150

spibootldr utility ................................................................151

Generating an image ..................................................................152

Configuration file ...............................................................152

General bootloader limitations ...............................................153

Customizing the SPI bootloader utility .............................................154

Customization hooks ...........................................................154

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Appendix C: Customizing the ROM Bootloader.................163

Overview ................................................................................164

Bootloader application images ......................................................164

ROM image .......................................................................164

RAM image .......................................................................165

Application image structure .........................................................166

Application image header .....................................................166

boothdr utility..........................................................................168

Generating an image ..................................................................168

Configuration file ...............................................................169

General bootloader limitations......................................................170

Overview of customizing .............................................................170

Customization hooks ..................................................................171

Appendix D: Customizing ACE ............................................ 179

Overview ................................................................................180

Configuring ACE ........................................................................180

Setting the static IP configuration ...........................................181

Setting DHCP configuration ...................................................182

AUTOIP configuration ..........................................................183

Stopping ACE ....................................................................183

Appendix E: Processor Modes and Exceptions ................ 185

Overview ................................................................................186

Vector table ............................................................................186

IRQ handler .............................................................................188

Servicing AHB interrupts in ARM9 based NET+ARM processor. ...........189

Servicing Bbus interrupts in ARM9 based NET+ARM processor ...........189

Changing interrupt priority ..........................................................190

AHB interrupts: ARM9-based processors.....................................190

Bbus interrupts: ARM9-based processors ....................................193

System interrupts: ARM7-based platforms ..................................195

       xiii

Interrupt service routines ............................................................197

Installing an ISR .................................................................197

Disabling and removing an ISR ................................................197

ARM9 FIQ handlers.....................................................................197

ARM7 FIQ handlers.....................................................................198

Appendix F: Memory Usage in Networked Applications

. 199

Overview ................................................................................200

Block pools.......................................................................200

Byte pools........................................................................200

Network heap application tuning ...................................................201

Memory usage in TCP connections ..................................................201

Active close of a TCP connection ...................................................202

Time wait state of a TCP connection...............................................203

Using a connection reset instead of an orderly close ............................203

Maximum number of sockets.........................................................204

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Review this section for basic information about this guide, as well as for general

support contact information.

About this guide

This guide describes NET+OS 6.2 and how to use it as part of your development

cycle. Part of the NET+Works integrated product family, NET+OS is a network

software suite optimized for the NET+ARM.

Software release

This guide supports NET+OS 6.2. By default, this software is installed in the

C:/netos62_ghs/ directory.

Who should read this guide

This guide is for software engineers and others who use NET+Works for NET+OS.

To complete the tasks described in this guide, you must:

 Be familiar with installing and configuring software.

 Have sufficient user privileges to do these tasks.

 Be familiar with network software and development board systems.

Using This Guide

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NET+Works with Green Hills BSP Porting Guide

Conventions used in this guide

This table describes the typographic conventions used in this guide:

What’s in this guide

This table shows where you can find information this guide:

This convention Is used for

italic type Emphasis, new terms, variables, and document titles.

bold, sans serif type

Menu commands, dialog box components, and other items that

appear on-screen.

Select

menu  option Menu commands. The first word is the menu name; the words that

follow are menu selections.

monospaced type

File names, pathnames, and code examples.

To read about See

An overview of the board support package Chapter 1, “Introduction”

Using the board support package to create a

platform for your customized hardware for

ARM7-based platforms

Chapter 2, “NET+OS BSP for ARM7”

Using the board support package to create a

platform for your customized hardware for

ARM9-based platforms

Chapter 3, “NET+OS BSP for ARM9”

The linker files that are provided for sample

projects

Chapter 4, “Linker Files”

How to update flash memory Chapter 5, “Adding Flash”

Device drivers and device definition Chapter 6, “Device Drivers”

NET+OS hardware dependencies for platforms

that use the NS7520 and NET+50 processor

Chapter 7, “Hardware Dependencies for

ARM7-based Platforms”

NET+OS hardware dependencies for platforms

that use the NS9360 and NS9750 processors

Chapter 8, “Hardware Dependencies for

ARM9-based Platforms”

The differences between the APIs in NET+OS

6.0 and NET+OS 6.2

Chapter 9, “Porting NET+OS v6.0 Applications

to NET+OS v 6.2”

The differences between the APIs in NET+OS

6.1 and NET+OS 6.2

Chapter 10, “Porting NET+OS v6.1

Applications to NET+OS v 6.2”

www.digi.com

       xvii

In addition, a series of appendixes provide information about:

 The central build system

 Customizing the SPI bootloader, the ROM bootloader, and the Address

Configuration Executive (ACE)

 Processor modes and exceptions

 Memory usage

Related documentation

 NET+Works Quick Install Guide describes how to install the hardware.

 NET+Works with Green Hills Getting Started Guide provides a brief,

hands-on exercise.

 NET+Works with Green Hills Programmer’s Guide describes how to use

NET+OS to develop programs for your application and hardware.

 The NET+Works online help describes the application program interfaces

(APIs) that are provided with NET+OS.

For information about third-party products and other components, review

the documentation CD-ROM that came with your development kit.

For information about the processor you are using, see your NET+Works

hardware documentation.

Documentation updates

Digi occasionally provides documentation updates on the Web site.

Be aware that if you see differences between the documentation you received in

your NET+Works package and the documentation on the Web site, the Web site

content is the latest version.

xviii       

NET+Works with Green Hills BSP Porting Guide

Customer support

To get help with a question or technical problem with this product, or to make

comments and recommendations about our products or documentation, use this

contact information:

 United State telephone: 1 877 912-3444

 International telephone: 1 952 912-3444

 email: [email protected]

 Web site: http://digi.com

       1

Introduction

CHAPTER 1

This chapter provides an overview of the Board Support Package (BSP) software,

describes how this software is segmented from higher layer application software, and

provides hardware design guidelines to minimize the cost of the software effort. In

addition, this chapter describes the NET+OS tree structure.

Overview

2       

NET+Works with Green Hills BSP Porting Guide

Overview

After you complete a system analysis that includes data throughput, I/O and

processing requirements and select the NET+ARM processor as the target processor,

you can begin two efforts: hardware design and software development.

Hardware design might require a complete new board design, reusing or modifying

a previous design, or using an off-the-shelf NET+ARM module. Target hardware

often is unavailable to software developers for weeks – and sometimes even

months. To minimize product time-to-market, you can begin software development

immediately by partitioning the effort into two distinct tasks: application

development and the board support package (BSP).

Application development

Application development involves piecing together hardware-independent, high-

level software components, while the BSP provides hardware-specific services along

a standardized application programming layer (API) to the application software.

By using a NET+ARM development board and its associated BSP, you can begin

software development immediately. NET+OS is delivered with BSPs to support all

NET+ARM development board platforms and all DIGI Connect products. Each BSP is

tailored to support the development board’s specific target processor (for example,

the NS9360 or NS7520) and the components that surround the processor (memory

and PHY).

The development board is ideal for prototyping general network services, including

Web pages, private management information bases (MIBs), FTP servers, SMTP clients,

or network startup characteristics such as DHCP or Auto IP. In addition, you can pro-

totype non-volatile system configuration, I/O protocols, field upgrade mechanisms,

or file system requirements effectively with a NET+ARM development board.

Alternatively, the BSP enables you to create the platform-specific software needed

to support a hardware platform. Because the BSP is hardware-specific, completing

this software requires the target hardware – and so must wait until the target

hardware is debugged and available.

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