BSP Developer's Guide

More documents

Recommendations

Info

VxWorks 5.5 BSP Developer’s Guide This section ends with a brief discussion of how VxWorks typically handles the execution of a SCSI command. I.3.1 SCSI Manager (scsiMgrLib) The SCSI manager functions as a task within VxWorks. There is one SCSI manager per SCSI controller, and it is responsible for managing all SCSI interaction between VxWorks tasks and the SCSI controller. Any number of VxWorks tasks can request services from SCSI peripheral devices. The SCSI bus is a shared critical resource which requires multitasking support and synchronization. For the sake of performance and efficiency, the SCSI manager controls all the SCSI traffic within the operating system. SCSI traffic includes requests for SCSI services by VxWorks tasks. These requests are asynchronous events from the SCSI bus and include SCSI reconnects, SCSI connection timeouts, and SCSI responses to requests by VxWorks tasks. This work flow is managed by SCSI threads, which are SCSI-library-specific abstractions. A SCSI thread is assigned to each unit of SCSI work. In other words, one SCSI thread is assigned per SCSI request. Each SCSI thread is created in the context of the calling VxWorks task. The thread is managed by the SCSI manager, while the calling VxWorks task remains blocked. When the SCSI thread completes, the VxWorks task is unblocked and the SCSI thread is deleted. A SCSI thread has its own context or state variables, which are manipulated by the SCSI libraries and the controller driver. A maximum of one SCSI thread can be executing at any one time. In addition to managing the SCSI-thread state information, the SCSI manager is responsible for scheduling these SCSI threads. When there are multiple threads in existence, the different threads can be in various states representing different requirements. A SCSI thread can represent a new request for service, a connection timeout, a completion of service, or an event from the SCSI bus. As requests for service are submitted to the SCSI manager by VxWorks tasks, the associated threads must be processed based on priority or on a first-come-first-serves basis if their priority is the same. When multiple threads are eligible for activation, the SCSI manager follows a strict hierarchy of processing. Asynchronous bus events have the highest priority and are processed before any other type of SCSI thread. The order of processing is: events, timeouts, requests, and finally responses. The SCSI manager handles any race condition that develops between activation of a request and the asynchronous occurrence of an event from the SCSI bus. 322
I Writing a SCSI-2 Device Driver Once an appropriate SCSI thread is selected for execution, the SCSI manager despatches that thread and actual execution is handled by the controller-specific driver. Limitations The SCSI manager uses standard VxWorks ring buffers to manage SCSI requests. Using ring buffers is fast and efficient. The amount of SCSI work that can be queued depends upon the size of the allocated ring buffers. The SCSI manager also has some limitations such as the maximum number of threads allowed (scsiMaxNumThreads), the maximum number of SCSI requests from VxWorks tasks that can be put on the SCSI manager’s request queue (scsiMgrRequestQSize), the maximum number of SCSI bus events that can be put on the SCSI manager’s event queue (scsiMgrEventQSize), the maximum number of replies that can be put on the reply queue (scsiMgrReplyQSize), the maximum number of timeouts that can be put on the timeout queue (scsiMgrTimeoutQSize), and timeout values. Configuration It is possible to tune the size of the ring buffers and the number of SCSI threads to optimize a specific environment. In most cases, however, the default values are sufficient. These parameters—scsiMaxNumThreads, scsiMgrRequestQSize, scsiMgrReplyQSize, scsiMgrEventQSize, scsiMgrTimeoutQSize—are defined as global variables within the SCSI library and are assigned default values defined in scsiLib.h. These values can be reassigned in the BSP routine sysScsiInit( ) prior to the invocation of the driver’s xxxCtrlInit( ) routine. Then when scsiCtrlInit( )is invoked by the driver’s xxxCtrlInit( )routine, the new parameters are used for data structure allocation. The name, priority, and stack size of the scsiMgr task can also be customized from the controller driver’s xxxCtrlCreate( ) routine. Defaults are provided in scsiLib.h. For example, the default task name SCSI_DEF_TASK_NAME is tScsiTask, the default priority, SCSI_DEF_TASK_PRIORITY, is 5, and the default stack size, SCSI_DEF_TASK_STACK_SIZE, is 4000. I NOTE: The larger the number of expected VxWorks SCSI tasks, the larger the stack space required. Thought should be given to the stack size parameter when customizing the SCSI manager. 323
Page 1 and 2:
VxWorks® 5.5 BSP DEVELOPER’S GUI
Page 3 and 4:
1 Overview ........................
Page 5 and 6:
Contents 1 Overview ...............
Page 7 and 8:
Contents 3.6.5 Cache, MMU, and DMA
Page 9 and 10:
Contents Memory-Mapped Chips ......
Page 11 and 12:
Contents 7.3.3 System Configuration
Page 13 and 14:
Contents 9.5.4 Processing .........
Page 15 and 16:
Contents F Generic Drivers ........
Page 17 and 18:
Contents Stopping the Driver Withou
Page 19 and 20:
1 Overview 1.1 Introduction One str
Page 21 and 22:
1 Overview ■ New Drivers Many new
Page 23 and 24:
1 Overview Included with Tornado (n
Page 25 and 26:
1 Overview ■ ■ ■ ■ ■ ■
Page 27 and 28:
1 Overview Table 1-1 Font Usage for
Page 29 and 30:
2 BSP Organization 2.1 Introduction
Page 31 and 32:
2 BSP Organization Files in the tar
Page 33 and 34:
2 BSP Organization Files in the tar
Page 35 and 36:
2 BSP Organization Version 1.0 BSPs
Page 37 and 38:
2 BSP Organization SM_MEM_SIZE The
Page 39 and 40:
2 BSP Organization For boards witho
Page 41 and 42:
2 BSP Organization PCI_MSTR_IO_LOCA
Page 43 and 44:
2 BSP Organization The entry point
Page 45 and 46:
2 BSP Organization target.nr The fi
Page 47 and 48:
2 BSP Organization bootrom This fil
Page 49 and 50:
2 BSP Organization sysSerialHwInit(
Page 51 and 52:
2 BSP Organization The Motorola M68
Page 53 and 54:
2 BSP Organization Many VxWorks fac
Page 55 and 56:
2 BSP Organization further board in
Page 57 and 58:
2 BSP Organization can have very un
Page 59 and 60:
3 Creating a New BSP 3.1 Introducti
Page 61 and 62:
3 Creating a New BSP 3.2 Setting Up
Page 63 and 64:
3 Creating a New BSP Makefile At a
Page 65 and 66:
3 Creating a New BSP char * sysBspR
Page 67 and 68:
3 Creating a New BSP ... #endif } T
Page 69 and 70:
3 Creating a New BSP int dummy; ...
Page 71 and 72:
3 Creating a New BSP To find the so
Page 73 and 74:
3 Creating a New BSP might want to
Page 75 and 76:
3 Creating a New BSP not, use the s
Page 77 and 78:
3 Creating a New BSP ■ It has a V
Page 79 and 80:
3 Creating a New BSP 3.6.7 SCSI VxW
Page 81 and 82:
4 Hardware Guidelines 4.1 Introduct
Page 83 and 84:
4 Hardware Guidelines to the start
Page 85 and 86:
4 Hardware Guidelines Higher-level
Page 87 and 88:
4 Hardware Guidelines Such dedicate
Page 89 and 90:
4 Hardware Guidelines Especially us
Page 91 and 92:
4 Hardware Guidelines selected from
Page 93 and 94:
4 Hardware Guidelines Hardware Inte
Page 95 and 96:
4 Hardware Guidelines The rest of t
Page 97 and 98:
4 Hardware Guidelines 4.4.2 System
Page 99 and 100:
4 Hardware Guidelines only deal wit
Page 101 and 102:
4 Hardware Guidelines 4.4.13 Parall
Page 103 and 104:
4 Hardware Guidelines 0x10000, /* 6
Page 105 and 106:
4 Hardware Guidelines The following
Page 107 and 108:
5 Driver Guidelines 5.1 Introductio
Page 109 and 110:
5 Driver Guidelines Maintenance and
Page 111 and 112:
5 Driver Guidelines word addresses.
Page 113 and 114:
5 Driver Guidelines 5.4 Design Guid
Page 115 and 116:
5 Driver Guidelines Per-Device Data
Page 117 and 118:
5 Driver Guidelines To fix this sit
Page 119 and 120:
5 Driver Guidelines block are more
Page 121 and 122:
5 Driver Guidelines 5.8 Driver Use
Page 123 and 124:
5 Driver Guidelines ■ ■ Memory
Page 125 and 126:
5 Driver Guidelines The level of ca
Page 127 and 128:
5 Driver Guidelines cache for the d
Page 129 and 130:
6 Components 6.1 Introduction Torna
Page 131 and 132:
6 Components 6.2 Component Descript
Page 133 and 134:
6 Components ■ User Presentation.
Page 135 and 136:
6 Components Folder FOLDER_ANSI { N
Page 137 and 138:
6 Components in a single project. I
Page 139 and 140:
6 Components The component object i
Page 141 and 142:
6 Components Parameters Parameters
Page 143 and 144:
6 Components In the example, the co
Page 145 and 146:
6 Components (2) comps/vxWorks/arch
Page 147 and 148:
6 Components Figure 6-4 Include Com
Page 149 and 150:
6 Components NOTE: INIT_BEFORE only
Page 151 and 152:
6 Components The _CHILDREN property
Page 153 and 154:
6 Components ! CAUTION: Do not alte
Page 155 and 156:
6 Components ■ Check the Project
Page 157 and 158:
7 Validation Testing 7.1 Introducti
Page 159 and 160:
7 Validation Testing ■ ■ The te
Page 161 and 162:
7 Validation Testing 2. The script
Page 163 and 164:
7 Validation Testing Figure 7-4 Typ
Page 165 and 166:
7 Validation Testing NOTE: Wind Riv
Page 167 and 168:
7 Validation Testing scsi Requires
Page 169 and 170:
7 Validation Testing Table 7-1 Vali
Page 171 and 172:
7 Validation Testing Table 7-2 Vali
Page 173 and 174:
7 Validation Testing sysProcNumGet
Page 175 and 176:
7 Validation Testing The log file c
Page 177 and 178:
8 Writing Portable C Code This chap
Page 179 and 180:
8 Writing Portable C Code attribute
Page 181 and 182:
8 Writing Portable C Code 8.1.3 Sta
Page 183 and 184:
8 Writing Portable C Code 8.1.5 Oth
Page 185 and 186:
8 Writing Portable C Code The last
Page 187 and 188:
8 Writing Portable C Code Always sp
Page 189 and 190:
8 Writing Portable C Code 8.2 Tool
Page 191 and 192:
9 Documentation Guidelines 9.1 Intr
Page 193 and 194:
9 Documentation Guidelines Spelling
Page 195 and 196:
9 Documentation Guidelines Table 9-
Page 197 and 198:
9 Documentation Guidelines Table 9-
Page 199 and 200:
9 Documentation Guidelines ■ Avoi
Page 201 and 202:
9 Documentation Guidelines ■ ■
Page 203 and 204:
9 Documentation Guidelines INCLUDE
Page 205 and 206:
9 Documentation Guidelines INTRODUC
Page 207 and 208:
9 Documentation Guidelines 9.5 Gene
Page 209 and 210:
9 Documentation Guidelines uppercas
Page 211 and 212:
9 Documentation Guidelines The foll
Page 213 and 214:
10 Product Packaging 10.1 SETUP Dev
Page 215 and 216:
10 Product Packaging ... include $(
Page 217 and 218:
10 Product Packaging Vendor-Supplie
Page 219 and 220:
10 Product Packaging in the project
Page 221 and 222:
A Upgrading a BSP for Tornado 2.0 T
Page 223 and 224:
A Upgrading a BSP for Tornado 2.0 A
Page 225 and 226:
A Upgrading a BSP for Tornado 2.0
Page 227 and 228:
A Upgrading a BSP for Tornado 2.0 6
Page 229 and 230:
B Upgrading a BSP for Tornado 2.2 T
Page 231 and 232:
B Upgrading a BSP for Tornado 2.2 C
Page 233 and 234:
B Upgrading a BSP for Tornado 2.2
Page 235 and 236:
B Upgrading a BSP for Tornado 2.2 c
Page 237 and 238:
B Upgrading a BSP for Tornado 2.2
Page 239 and 240:
C Upgrading a BSP for the VxWorks N
Page 241 and 242:
D VxWorks Boot Sequence Table D-1 d
Page 243 and 244:
D VxWorks Boot Sequence Table D-1 V
Page 245 and 246:
Page 247 and 248:
Page 249 and 250:
E Component Language E.1 Component
Page 251 and 252:
E Component Language REQUIRES r1 r2
Page 253 and 254:
E Component Language } // default i
Page 255 and 256:
E Component Language FOLDER_WINDVIE
Page 257 and 258:
E Component Language initialization
Page 259 and 260:
E Component Language INCLUDE_MMU_BA
Page 261 and 262:
E Component Language INCLUDE_NETWOR
Page 263 and 264:
E Component Language INCLUDE_WDB_ME
Page 265 and 266:
F Generic Drivers F.1 Introduction
Page 267 and 268:
F Generic Drivers CONSOLE_TTY This
Page 269 and 270:
F Generic Drivers Define SIO_CALLBA
Page 271 and 272:
F Generic Drivers NV_RAM_SIZE Defin
Page 273 and 274:
F Generic Drivers F.10 PCI Bus The
Page 275 and 276:
G Upgrading 4.3 BSD Network Drivers
Page 277 and 278:
Page 279 and 280:
Page 281 and 282:
Page 283 and 284:
Page 285 and 286:
H Implementing a MUX-Based Network
Page 287 and 288:
H Implementing a MUX-Based Network
Page 289 and 290: H Implementing a MUX-Based Network
Page 335 and 336: I Writing a SCSI-2 Device Driver I.
Page 337 and 338: I Writing a SCSI-2 Device Driver SC
Page 339: I Writing a SCSI-2 Device Driver Fo
Page 345 and 346: I Writing a SCSI-2 Device Driver A
Page 347 and 348: I Writing a SCSI-2 Device Driver /*
Page 349 and 350: I Writing a SCSI-2 Device Driver */
Page 351 and 352: I Writing a SCSI-2 Device Driver *
Page 353 and 354: I Writing a SCSI-2 Device Driver Th
Page 355 and 356: I Writing a SCSI-2 Device Driver Fo
Page 357 and 358: I Writing a SCSI-2 Device Driver #i
Page 369 and 370: I Writing a SCSI-2 Device Driver */
Page 371 and 372: I Writing a SCSI-2 Device Driver ;
Page 373 and 374: I Writing a SCSI-2 Device Driver ;/
Page 377 and 378: I Writing a SCSI-2 Device Driver re
Page 379 and 380: I Writing a SCSI-2 Device Driver Fo
Page 381 and 382: I Writing a SCSI-2 Device Driver Th
Page 383 and 384: J BSP Validation Test Suite Referen
Page 391 and 392:
J BSP Validation Test Suite Referen
Page 393 and 394:
Page 395 and 396:
Page 397 and 398:
Page 399 and 400:
Page 401 and 402:
Page 403 and 404:
Page 405 and 406:
Page 407 and 408:
Page 409 and 410:
Page 411 and 412:
Page 413 and 414:
Page 415 and 416:
Page 417 and 418:
Page 419 and 420:
K BSP Validation Checklists This ap
Page 421 and 422:
K BSP Validation Checklists BSP Val
Page 423 and 424:
K BSP Validation Checklists 7. Veri
Page 425 and 426:
K BSP Validation Checklists 2. If t
Page 427 and 428:
K BSP Validation Checklists Validat
Page 429 and 430:
K BSP Validation Checklists Manufac
Page 431 and 432:
K BSP Validation Checklists Manufac
Page 433 and 434:
L Refgen NOTE: In Tornado 1.0.1 and
Page 435 and 436:
L Refgen * SYNOPSIS * \cs * void xx
Page 437 and 438:
L Refgen Yields output approximatel
Page 439 and 440:
L Refgen EXAMPLE INCLUDES SEE ALSO
Page 441 and 442:
M BSP Product Contents When you are
Page 443 and 444:
M BSP Product Contents Do not inclu
Page 445 and 446:
Index A abort button 82 addressing
Page 447 and 448:
Index clocks see also individual cl
Page 449 and 450:
Index naming conventions 95 perform
Page 451 and 452:
Index INCLUDE_USR_APPL 38 INCLUDE_V
Page 453 and 454:
Index network drivers 58 network in
Page 455 and 456:
Index scsiCtrlLib 324 scsiDirectLib
Page 457 and 458:
Index testing, validation 139-158 s
show all

BSP Developer's Guide

Create successful ePaper yourself

Delete template?

Save as template?