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Linux-2.6.12-rc2
[GitHub/exynos8895/android_kernel_samsung_universal8895.git] / Documentation / scsi / sym53c8xx_2.txt
1 The Linux SYM-2 driver documentation file
2
3 Written by Gerard Roudier <groudier@free.fr>
4 21 Rue Carnot
5 95170 DEUIL LA BARRE - FRANCE
6
7 Updated by Matthew Wilcox <matthew@wil.cx>
8
9 2004-10-09
10 ===============================================================================
11
12 1. Introduction
13 2. Supported chips and SCSI features
14 3. Advantages of this driver for newer chips.
15 3.1 Optimized SCSI SCRIPTS
16 3.2 New features appeared with the SYM53C896
17 4. Memory mapped I/O versus normal I/O
18 5. Tagged command queueing
19 6. Parity checking
20 7. Profiling information
21 8. Control commands
22 8.1 Set minimum synchronous period
23 8.2 Set wide size
24 8.3 Set maximum number of concurrent tagged commands
25 8.4 Set debug mode
26 8.5 Set flag (no_disc)
27 8.6 Set verbose level
28 8.7 Reset all logical units of a target
29 8.8 Abort all tasks of all logical units of a target
30 9. Configuration parameters
31 10. Boot setup commands
32 10.1 Syntax
33 10.2 Available arguments
34 10.2.1 Default number of tagged commands
35 10.2.2 Burst max
36 10.2.3 LED support
37 10.2.4 Differential mode
38 10.2.5 IRQ mode
39 10.2.6 Check SCSI BUS
40 10.2.7 Suggest a default SCSI id for hosts
41 10.2.8 Verbosity level
42 10.2.9 Debug mode
43 10.2.10 Settle delay
44 10.2.11 Serial NVRAM
45 10.2.12 Exclude a host from being attached
46 10.3 Converting from old options
47 10.4 SCSI BUS checking boot option
48 11. SCSI problem troubleshooting
49 15.1 Problem tracking
50 15.2 Understanding hardware error reports
51 12. Serial NVRAM support (by Richard Waltham)
52 17.1 Features
53 17.2 Symbios NVRAM layout
54 17.3 Tekram NVRAM layout
55
56 ===============================================================================
57
58 1. Introduction
59
60 This driver supports the whole SYM53C8XX family of PCI-SCSI controllers.
61 It also support the subset of LSI53C10XX PCI-SCSI controllers that are based
62 on the SYM53C8XX SCRIPTS language.
63
64 It replaces the sym53c8xx+ncr53c8xx driver bundle and shares its core code
65 with the FreeBSD SYM-2 driver. The `glue' that allows this driver to work
66 under Linux is contained in 2 files named sym_glue.h and sym_glue.c.
67 Other drivers files are intended not to depend on the Operating System
68 on which the driver is used.
69
70 The history of this driver can be summerized as follows:
71
72 1993: ncr driver written for 386bsd and FreeBSD by:
73 Wolfgang Stanglmeier <wolf@cologne.de>
74 Stefan Esser <se@mi.Uni-Koeln.de>
75
76 1996: port of the ncr driver to Linux-1.2.13 and rename it ncr53c8xx.
77 Gerard Roudier
78
79 1998: new sym53c8xx driver for Linux based on LOAD/STORE instruction and that
80 adds full support for the 896 but drops support for early NCR devices.
81 Gerard Roudier
82
83 1999: port of the sym53c8xx driver to FreeBSD and support for the LSI53C1010
84 33 MHz and 66MHz Ultra-3 controllers. The new driver is named `sym'.
85 Gerard Roudier
86
87 2000: Add support for early NCR devices to FreeBSD `sym' driver.
88 Break the driver into several sources and separate the OS glue
89 code from the core code that can be shared among different O/Ses.
90 Write a glue code for Linux.
91 Gerard Roudier
92
93 2004: Remove FreeBSD compatibility code. Remove support for versions of
94 Linux before 2.6. Start using Linux facilities.
95
96 This README file addresses the Linux version of the driver. Under FreeBSD,
97 the driver documentation is the sym.8 man page.
98
99 Information about new chips is available at LSILOGIC web server:
100
101 http://www.lsilogic.com/
102
103 SCSI standard documentations are available at T10 site:
104
105 http://www.t10.org/
106
107 Useful SCSI tools written by Eric Youngdale are part of most Linux
108 distributions:
109 scsiinfo: command line tool
110 scsi-config: TCL/Tk tool using scsiinfo
111
112 2. Supported chips and SCSI features
113
114 The following features are supported for all chips:
115
116 Synchronous negotiation
117 Disconnection
118 Tagged command queuing
119 SCSI parity checking
120 PCI Master parity checking
121
122 Other features depends on chip capabilities.
123 The driver notably uses optimized SCRIPTS for devices that support
124 LOAD/STORE and handles PHASE MISMATCH from SCRIPTS for devices that
125 support the corresponding feature.
126
127 The following table shows some characteristics of the chip family.
128
129 On board LOAD/STORE HARDWARE
130 Chip SDMS BIOS Wide SCSI std. Max. sync SCRIPTS PHASE MISMATCH
131 ---- --------- ---- --------- ---------- ---------- --------------
132 810 N N FAST10 10 MB/s N N
133 810A N N FAST10 10 MB/s Y N
134 815 Y N FAST10 10 MB/s N N
135 825 Y Y FAST10 20 MB/s N N
136 825A Y Y FAST10 20 MB/s Y N
137 860 N N FAST20 20 MB/s Y N
138 875 Y Y FAST20 40 MB/s Y N
139 875A Y Y FAST20 40 MB/s Y Y
140 876 Y Y FAST20 40 MB/s Y N
141 895 Y Y FAST40 80 MB/s Y N
142 895A Y Y FAST40 80 MB/s Y Y
143 896 Y Y FAST40 80 MB/s Y Y
144 897 Y Y FAST40 80 MB/s Y Y
145 1510D Y Y FAST40 80 MB/s Y Y
146 1010 Y Y FAST80 160 MB/s Y Y
147 1010_66* Y Y FAST80 160 MB/s Y Y
148
149 * Chip supports 33MHz and 66MHz PCI bus clock.
150
151
152 Summary of other supported features:
153
154 Module: allow to load the driver
155 Memory mapped I/O: increases performance
156 Control commands: write operations to the proc SCSI file system
157 Debugging information: written to syslog (expert only)
158 Scatter / gather
159 Shared interrupt
160 Boot setup commands
161 Serial NVRAM: Symbios and Tekram formats
162
163
164 3. Advantages of this driver for newer chips.
165
166 3.1 Optimized SCSI SCRIPTS.
167
168 All chips except the 810, 815 and 825, support new SCSI SCRIPTS instructions
169 named LOAD and STORE that allow to move up to 1 DWORD from/to an IO register
170 to/from memory much faster that the MOVE MEMORY instruction that is supported
171 by the 53c7xx and 53c8xx family.
172
173 The LOAD/STORE instructions support absolute and DSA relative addressing
174 modes. The SCSI SCRIPTS had been entirely rewritten using LOAD/STORE instead
175 of MOVE MEMORY instructions.
176
177 Due to the lack of LOAD/STORE SCRIPTS instructions by earlier chips, this
178 driver also incorporates a different SCRIPTS set based on MEMORY MOVE, in
179 order to provide support for the entire SYM53C8XX chips family.
180
181 3.2 New features appeared with the SYM53C896
182
183 Newer chips (see above) allows handling of the phase mismatch context from
184 SCRIPTS (avoids the phase mismatch interrupt that stops the SCSI processor
185 until the C code has saved the context of the transfer).
186
187 The 896 and 1010 chips support 64 bit PCI transactions and addressing,
188 while the 895A supports 32 bit PCI transactions and 64 bit addressing.
189 The SCRIPTS processor of these chips is not true 64 bit, but uses segment
190 registers for bit 32-63. Another interesting feature is that LOAD/STORE
191 instructions that address the on-chip RAM (8k) remain internal to the chip.
192
193 4. Memory mapped I/O versus normal I/O
194
195 Memory mapped I/O has less latency than normal I/O and is the recommended
196 way for doing IO with PCI devices. Memory mapped I/O seems to work fine on
197 most hardware configurations, but some poorly designed chipsets may break
198 this feature. A configuration option is provided for normal I/O to be
199 used but the driver defaults to MMIO.
200
201 5. Tagged command queueing
202
203 Queuing more than 1 command at a time to a device allows it to perform
204 optimizations based on actual head positions and its mechanical
205 characteristics. This feature may also reduce average command latency.
206 In order to really gain advantage of this feature, devices must have
207 a reasonable cache size (No miracle is to be expected for a low-end
208 hard disk with 128 KB or less).
209 Some kown old SCSI devices do not properly support tagged command queuing.
210 Generally, firmware revisions that fix this kind of problems are available
211 at respective vendor web/ftp sites.
212 All I can say is that I never have had problem with tagged queuing using
213 this driver and its predecessors. Hard disks that behaved correctly for
214 me using tagged commands are the following:
215
216 - IBM S12 0662
217 - Conner 1080S
218 - Quantum Atlas I
219 - Quantum Atlas II
220 - Seagate Cheetah I
221 - Quantum Viking II
222 - IBM DRVS
223 - Quantum Atlas IV
224 - Seagate Cheetah II
225
226 If your controller has NVRAM, you can configure this feature per target
227 from the user setup tool. The Tekram Setup program allows to tune the
228 maximum number of queued commands up to 32. The Symbios Setup only allows
229 to enable or disable this feature.
230
231 The maximum number of simultaneous tagged commands queued to a device
232 is currently set to 16 by default. This value is suitable for most SCSI
233 disks. With large SCSI disks (>= 2GB, cache >= 512KB, average seek time
234 <= 10 ms), using a larger value may give better performances.
235
236 This driver supports up to 255 commands per device, and but using more than
237 64 is generally not worth-while, unless you are using a very large disk or
238 disk arrays. It is noticeable that most of recent hard disks seem not to
239 accept more than 64 simultaneous commands. So, using more than 64 queued
240 commands is probably just resource wasting.
241
242 If your controller does not have NVRAM or if it is managed by the SDMS
243 BIOS/SETUP, you can configure tagged queueing feature and device queue
244 depths from the boot command-line. For example:
245
246 sym53c8xx=tags:4/t2t3q15-t4q7/t1u0q32
247
248 will set tagged commands queue depths as follow:
249
250 - target 2 all luns on controller 0 --> 15
251 - target 3 all luns on controller 0 --> 15
252 - target 4 all luns on controller 0 --> 7
253 - target 1 lun 0 on controller 1 --> 32
254 - all other target/lun --> 4
255
256 In some special conditions, some SCSI disk firmwares may return a
257 QUEUE FULL status for a SCSI command. This behaviour is managed by the
258 driver using the following heuristic:
259
260 - Each time a QUEUE FULL status is returned, tagged queue depth is reduced
261 to the actual number of disconnected commands.
262
263 - Every 200 successfully completed SCSI commands, if allowed by the
264 current limit, the maximum number of queueable commands is incremented.
265
266 Since QUEUE FULL status reception and handling is resource wasting, the
267 driver notifies by default this problem to user by indicating the actual
268 number of commands used and their status, as well as its decision on the
269 device queue depth change.
270 The heuristic used by the driver in handling QUEUE FULL ensures that the
271 impact on performances is not too bad. You can get rid of the messages by
272 setting verbose level to zero, as follow:
273
274 1st method: boot your system using 'sym53c8xx=verb:0' option.
275 2nd method: apply "setverbose 0" control command to the proc fs entry
276 corresponding to your controller after boot-up.
277
278 6. Parity checking
279
280 The driver supports SCSI parity checking and PCI bus master parity
281 checking. These features must be enabled in order to ensure safe
282 data transfers. Some flawed devices or mother boards may have problems
283 with parity. The options to defeat parity checking have been removed
284 from the driver.
285
286 7. Profiling information
287
288 This driver does not provide profiling informations as did its predecessors.
289 This feature was not this useful and added complexity to the code.
290 As the driver code got more complex, I have decided to remove everything
291 that didn't seem actually useful.
292
293 8. Control commands
294
295 Control commands can be sent to the driver with write operations to
296 the proc SCSI file system. The generic command syntax is the
297 following:
298
299 echo "<verb> <parameters>" >/proc/scsi/sym53c8xx/0
300 (assumes controller number is 0)
301
302 Using "all" for "<target>" parameter with the commands below will
303 apply to all targets of the SCSI chain (except the controller).
304
305 Available commands:
306
307 8.1 Set minimum synchronous period factor
308
309 setsync <target> <period factor>
310
311 target: target number
312 period: minimum synchronous period.
313 Maximum speed = 1000/(4*period factor) except for special
314 cases below.
315
316 Specify a period of 0, to force asynchronous transfer mode.
317
318 9 means 12.5 nano-seconds synchronous period
319 10 means 25 nano-seconds synchronous period
320 11 means 30 nano-seconds synchronous period
321 12 means 50 nano-seconds synchronous period
322
323 8.2 Set wide size
324
325 setwide <target> <size>
326
327 target: target number
328 size: 0=8 bits, 1=16bits
329
330 8.3 Set maximum number of concurrent tagged commands
331
332 settags <target> <tags>
333
334 target: target number
335 tags: number of concurrent tagged commands
336 must not be greater than configured (default: 16)
337
338 8.4 Set debug mode
339
340 setdebug <list of debug flags>
341
342 Available debug flags:
343 alloc: print info about memory allocations (ccb, lcb)
344 queue: print info about insertions into the command start queue
345 result: print sense data on CHECK CONDITION status
346 scatter: print info about the scatter process
347 scripts: print info about the script binding process
348 tiny: print minimal debugging information
349 timing: print timing information of the NCR chip
350 nego: print information about SCSI negotiations
351 phase: print information on script interruptions
352
353 Use "setdebug" with no argument to reset debug flags.
354
355
356 8.5 Set flag (no_disc)
357
358 setflag <target> <flag>
359
360 target: target number
361
362 For the moment, only one flag is available:
363
364 no_disc: not allow target to disconnect.
365
366 Do not specify any flag in order to reset the flag. For example:
367 - setflag 4
368 will reset no_disc flag for target 4, so will allow it disconnections.
369 - setflag all
370 will allow disconnection for all devices on the SCSI bus.
371
372
373 8.6 Set verbose level
374
375 setverbose #level
376
377 The driver default verbose level is 1. This command allows to change
378 th driver verbose level after boot-up.
379
380 8.7 Reset all logical units of a target
381
382 resetdev <target>
383
384 target: target number
385 The driver will try to send a BUS DEVICE RESET message to the target.
386
387 8.8 Abort all tasks of all logical units of a target
388
389 cleardev <target>
390
391 target: target number
392 The driver will try to send a ABORT message to all the logical units
393 of the target.
394
395
396 9. Configuration parameters
397
398 Under kernel configuration tools (make menuconfig, for example), it is
399 possible to change some default driver configuration parameters.
400 If the firmware of all your devices is perfect enough, all the
401 features supported by the driver can be enabled at start-up. However,
402 if only one has a flaw for some SCSI feature, you can disable the
403 support by the driver of this feature at linux start-up and enable
404 this feature after boot-up only for devices that support it safely.
405
406 Configuration parameters:
407
408 Use normal IO (default answer: n)
409 Answer "y" if you suspect your mother board to not allow memory mapped I/O.
410 May slow down performance a little.
411
412 Default tagged command queue depth (default answer: 16)
413 Entering 0 defaults to tagged commands not being used.
414 This parameter can be specified from the boot command line.
415
416 Maximum number of queued commands (default answer: 32)
417 This option allows you to specify the maximum number of tagged commands
418 that can be queued to a device. The maximum supported value is 255.
419
420 Synchronous transfers frequency (default answer: 80)
421 This option allows you to specify the frequency in MHz the driver
422 will use at boot time for synchronous data transfer negotiations.
423 0 means "asynchronous data transfers".
424
425 10. Boot setup commands
426
427 10.1 Syntax
428
429 Setup commands can be passed to the driver either at boot time or as
430 parameters to modprobe, as described in Documentation/kernel-parameters.txt
431
432 Example of boot setup command under lilo prompt:
433
434 lilo: linux root=/dev/sda2 sym53c8xx.cmd_per_lun=4 sym53c8xx.sync=10 sym53c8xx.debug=0x200
435
436 - enable tagged commands, up to 4 tagged commands queued.
437 - set synchronous negotiation speed to 10 Mega-transfers / second.
438 - set DEBUG_NEGO flag.
439
440 The following command will install the driver module with the same
441 options as above.
442
443 modprobe sym53c8xx cmd_per_lun=4 sync=10 debug=0x200
444
445 10.2 Available arguments
446
447 10.2.1 Default number of tagged commands
448 cmd_per_lun=0 (or cmd_per_lun=1) tagged command queuing disabled
449 cmd_per_lun=#tags (#tags > 1) tagged command queuing enabled
450 #tags will be truncated to the max queued commands configuration parameter.
451
452 10.2.2 Detailed control of tagged commands
453 This option allows you to specify a command queue depth for each device
454 that supports tagged command queueing.
455 Example:
456 tag_ctrl=10/t2t3q16-t5q24/t1u2q32
457 will set devices queue depth as follow:
458 - controller #0 target #2 and target #3 -> 16 commands,
459 - controller #0 target #5 -> 24 commands,
460 - controller #1 target #1 logical unit #2 -> 32 commands,
461 - all other logical units (all targets, all controllers) -> 10 commands.
462
463 10.2.3 Burst max
464 burst=0 burst disabled
465 burst=255 get burst length from initial IO register settings.
466 burst=#x burst enabled (1<<#x burst transfers max)
467 #x is an integer value which is log base 2 of the burst transfers max.
468 By default the driver uses the maximum value supported by the chip.
469
470 10.2.4 LED support
471 led=1 enable LED support
472 led=0 disable LED support
473 Do not enable LED support if your scsi board does not use SDMS BIOS.
474 (See 'Configuration parameters')
475
476 10.2.4 Differential mode
477 diff=0 never set up diff mode
478 diff=1 set up diff mode if BIOS set it
479 diff=2 always set up diff mode
480 diff=3 set diff mode if GPIO3 is not set
481
482 10.2.5 IRQ mode
483 irqm=0 always open drain
484 irqm=1 same as initial settings (assumed BIOS settings)
485 irqm=2 always totem pole
486
487 10.2.6 Check SCSI BUS
488 buschk=<option bits>
489
490 Available option bits:
491 0x0: No check.
492 0x1: Check and do not attach the controller on error.
493 0x2: Check and just warn on error.
494
495 10.2.7 Suggest a default SCSI id for hosts
496 hostid=255 no id suggested.
497 hostid=#x (0 < x < 7) x suggested for hosts SCSI id.
498
499 If a host SCSI id is available from the NVRAM, the driver will ignore
500 any value suggested as boot option. Otherwise, if a suggested value
501 different from 255 has been supplied, it will use it. Otherwise, it will
502 try to deduce the value previously set in the hardware and use value
503 7 if the hardware value is zero.
504
505 10.2.8 Verbosity level
506 verb=0 minimal
507 verb=1 normal
508 verb=2 too much
509
510 10.2.9 Debug mode
511 debug=0 clear debug flags
512 debug=#x set debug flags
513 #x is an integer value combining the following power-of-2 values:
514 DEBUG_ALLOC 0x1
515 DEBUG_PHASE 0x2
516 DEBUG_POLL 0x4
517 DEBUG_QUEUE 0x8
518 DEBUG_RESULT 0x10
519 DEBUG_SCATTER 0x20
520 DEBUG_SCRIPT 0x40
521 DEBUG_TINY 0x80
522 DEBUG_TIMING 0x100
523 DEBUG_NEGO 0x200
524 DEBUG_TAGS 0x400
525 DEBUG_FREEZE 0x800
526 DEBUG_RESTART 0x1000
527
528 You can play safely with DEBUG_NEGO. However, some of these flags may
529 generate bunches of syslog messages.
530
531 10.2.10 Settle delay
532 settle=n delay for n seconds
533
534 After a bus reset, the driver will delay for n seconds before talking
535 to any device on the bus. The default is 3 seconds and safe mode will
536 default it to 10.
537
538 10.2.11 Serial NVRAM
539 NB: option not currently implemented.
540 nvram=n do not look for serial NVRAM
541 nvram=y test controllers for onboard serial NVRAM
542 (alternate binary form)
543 nvram=<bits options>
544 0x01 look for NVRAM (equivalent to nvram=y)
545 0x02 ignore NVRAM "Synchronous negotiation" parameters for all devices
546 0x04 ignore NVRAM "Wide negotiation" parameter for all devices
547 0x08 ignore NVRAM "Scan at boot time" parameter for all devices
548 0x80 also attach controllers set to OFF in the NVRAM (sym53c8xx only)
549
550 10.2.12 Exclude a host from being attached
551 excl=<io_address>,...
552
553 Prevent host at a given io address from being attached.
554 For example 'excl=0xb400,0xc000' indicate to the
555 driver not to attach hosts at address 0xb400 and 0xc000.
556
557 10.3 Converting from old style options
558
559 Previously, the sym2 driver accepted arguments of the form
560 sym53c8xx=tags:4,sync:10,debug:0x200
561
562 As a result of the new module parameters, this is no longer available.
563 Most of the options have remained the same, but tags has split into
564 cmd_per_lun and tag_ctrl for its two different purposes. The sample above
565 would be specified as:
566 modprobe sym53c8xx cmd_per_lun=4 sync=10 debug=0x200
567
568 or on the kernel boot line as:
569 sym53c8xx.cmd_per_lun=4 sym53c8xx.sync=10 sym53c8xx.debug=0x200
570
571 10.4 SCSI BUS checking boot option.
572
573 When this option is set to a non-zero value, the driver checks SCSI lines
574 logic state, 100 micro-seconds after having asserted the SCSI RESET line.
575 The driver just reads SCSI lines and checks all lines read FALSE except RESET.
576 Since SCSI devices shall release the BUS at most 800 nano-seconds after SCSI
577 RESET has been asserted, any signal to TRUE may indicate a SCSI BUS problem.
578 Unfortunately, the following common SCSI BUS problems are not detected:
579 - Only 1 terminator installed.
580 - Misplaced terminators.
581 - Bad quality terminators.
582 On the other hand, either bad cabling, broken devices, not conformant
583 devices, ... may cause a SCSI signal to be wrong when te driver reads it.
584
585 15. SCSI problem troubleshooting
586
587 15.1 Problem tracking
588
589 Most SCSI problems are due to a non conformant SCSI bus or too buggy
590 devices. If infortunately you have SCSI problems, you can check the
591 following things:
592
593 - SCSI bus cables
594 - terminations at both end of the SCSI chain
595 - linux syslog messages (some of them may help you)
596
597 If you do not find the source of problems, you can configure the
598 driver or devices in the NVRAM with minimal features.
599
600 - only asynchronous data transfers
601 - tagged commands disabled
602 - disconnections not allowed
603
604 Now, if your SCSI bus is ok, your system has every chance to work
605 with this safe configuration but performances will not be optimal.
606
607 If it still fails, then you can send your problem description to
608 appropriate mailing lists or news-groups. Send me a copy in order to
609 be sure I will receive it. Obviously, a bug in the driver code is
610 possible.
611
612 My cyrrent email address: Gerard Roudier <groudier@free.fr>
613
614 Allowing disconnections is important if you use several devices on
615 your SCSI bus but often causes problems with buggy devices.
616 Synchronous data transfers increases throughput of fast devices like
617 hard disks. Good SCSI hard disks with a large cache gain advantage of
618 tagged commands queuing.
619
620 15.2 Understanding hardware error reports
621
622 When the driver detects an unexpected error condition, it may display a
623 message of the following pattern.
624
625 sym0:1: ERROR (0:48) (1-21-65) (f/95/0) @ (script 7c0:19000000).
626 sym0: script cmd = 19000000
627 sym0: regdump: da 10 80 95 47 0f 01 07 75 01 81 21 80 01 09 00.
628
629 Some fields in such a message may help you understand the cause of the
630 problem, as follows:
631
632 sym0:1: ERROR (0:48) (1-21-65) (f/95/0) @ (script 7c0:19000000).
633 .....A.........B.C....D.E..F....G.H..I.......J.....K...L.......
634
635 Field A : target number.
636 SCSI ID of the device the controller was talking with at the moment the
637 error occurs.
638
639 Field B : DSTAT io register (DMA STATUS)
640 Bit 0x40 : MDPE Master Data Parity Error
641 Data parity error detected on the PCI BUS.
642 Bit 0x20 : BF Bus Fault
643 PCI bus fault condition detected
644 Bit 0x01 : IID Illegal Instruction Detected
645 Set by the chip when it detects an Illegal Instruction format
646 on some condition that makes an instruction illegal.
647 Bit 0x80 : DFE Dma Fifo Empty
648 Pure status bit that does not indicate an error.
649 If the reported DSTAT value contains a combination of MDPE (0x40),
650 BF (0x20), then the cause may be likely due to a PCI BUS problem.
651
652 Field C : SIST io register (SCSI Interrupt Status)
653 Bit 0x08 : SGE SCSI GROSS ERROR
654 Indicates that the chip detected a severe error condition
655 on the SCSI BUS that prevents the SCSI protocol from functioning
656 properly.
657 Bit 0x04 : UDC Unexpected Disconnection
658 Indicates that the device released the SCSI BUS when the chip
659 was not expecting this to happen. A device may behave so to
660 indicate the SCSI initiator that an error condition not reportable using the SCSI protocol has occurred.
661 Bit 0x02 : RST SCSI BUS Reset
662 Generally SCSI targets do not reset the SCSI BUS, although any
663 device on the BUS can reset it at any time.
664 Bit 0x01 : PAR Parity
665 SCSI parity error detected.
666 On a faulty SCSI BUS, any error condition among SGE (0x08), UDC (0x04) and
667 PAR (0x01) may be detected by the chip. If your SCSI system sometimes
668 encounters such error conditions, especially SCSI GROSS ERROR, then a SCSI
669 BUS problem is likely the cause of these errors.
670
671 For fields D,E,F,G and H, you may look into the sym53c8xx_defs.h file
672 that contains some minimal comments on IO register bits.
673 Field D : SOCL Scsi Output Control Latch
674 This register reflects the state of the SCSI control lines the
675 chip want to drive or compare against.
676 Field E : SBCL Scsi Bus Control Lines
677 Actual value of control lines on the SCSI BUS.
678 Field F : SBDL Scsi Bus Data Lines
679 Actual value of data lines on the SCSI BUS.
680 Field G : SXFER SCSI Transfer
681 Contains the setting of the Synchronous Period for output and
682 the current Synchronous offset (offset 0 means asynchronous).
683 Field H : SCNTL3 Scsi Control Register 3
684 Contains the setting of timing values for both asynchronous and
685 synchronous data transfers.
686 Field I : SCNTL4 Scsi Control Register 4
687 Only meaninful for 53C1010 Ultra3 controllers.
688
689 Understanding Fields J, K, L and dumps requires to have good knowledge of
690 SCSI standards, chip cores functionnals and internal driver data structures.
691 You are not required to decode and understand them, unless you want to help
692 maintain the driver code.
693
694 17. Serial NVRAM (added by Richard Waltham: dormouse@farsrobt.demon.co.uk)
695
696 17.1 Features
697
698 Enabling serial NVRAM support enables detection of the serial NVRAM included
699 on Symbios and some Symbios compatible host adaptors, and Tekram boards. The
700 serial NVRAM is used by Symbios and Tekram to hold set up parameters for the
701 host adaptor and it's attached drives.
702
703 The Symbios NVRAM also holds data on the boot order of host adaptors in a
704 system with more than one host adaptor. This information is no longer used
705 as it's fundamentally incompatible with the hotplug PCI model.
706
707 Tekram boards using Symbios chips, DC390W/F/U, which have NVRAM are detected
708 and this is used to distinguish between Symbios compatible and Tekram host
709 adaptors. This is used to disable the Symbios compatible "diff" setting
710 incorrectly set on Tekram boards if the CONFIG_SCSI_53C8XX_SYMBIOS_COMPAT
711 configuration parameter is set enabling both Symbios and Tekram boards to be
712 used together with the Symbios cards using all their features, including
713 "diff" support. ("led pin" support for Symbios compatible cards can remain
714 enabled when using Tekram cards. It does nothing useful for Tekram host
715 adaptors but does not cause problems either.)
716
717 The parameters the driver is able to get from the NVRAM depend on the
718 data format used, as follow:
719
720 Tekram format Symbios format
721 General and host parameters
722 Boot order N Y
723 Host SCSI ID Y Y
724 SCSI parity checking Y Y
725 Verbose boot messages N Y
726 SCSI devices parameters
727 Synchronous transfer speed Y Y
728 Wide 16 / Narrow Y Y
729 Tagged Command Queuing enabled Y Y
730 Disconnections enabled Y Y
731 Scan at boot time N Y
732
733 In order to speed up the system boot, for each device configured without
734 the "scan at boot time" option, the driver forces an error on the
735 first TEST UNIT READY command received for this device.
736
737
738 17.2 Symbios NVRAM layout
739
740 typical data at NVRAM address 0x100 (53c810a NVRAM)
741 -----------------------------------------------------------
742 00 00
743 64 01
744 8e 0b
745
746 00 30 00 00 00 00 07 00 00 00 00 00 00 00 07 04 10 04 00 00
747
748 04 00 0f 00 00 10 00 50 00 00 01 00 00 62
749 04 00 03 00 00 10 00 58 00 00 01 00 00 63
750 04 00 01 00 00 10 00 48 00 00 01 00 00 61
751 00 00 00 00 00 00 00 00 00 00 00 00 00 00
752
753 0f 00 08 08 64 00 0a 00
754 0f 00 08 08 64 00 0a 00
755 0f 00 08 08 64 00 0a 00
756 0f 00 08 08 64 00 0a 00
757 0f 00 08 08 64 00 0a 00
758 0f 00 08 08 64 00 0a 00
759 0f 00 08 08 64 00 0a 00
760 0f 00 08 08 64 00 0a 00
761
762 0f 00 08 08 64 00 0a 00
763 0f 00 08 08 64 00 0a 00
764 0f 00 08 08 64 00 0a 00
765 0f 00 08 08 64 00 0a 00
766 0f 00 08 08 64 00 0a 00
767 0f 00 08 08 64 00 0a 00
768 0f 00 08 08 64 00 0a 00
769 0f 00 08 08 64 00 0a 00
770
771 00 00 00 00 00 00 00 00
772 00 00 00 00 00 00 00 00
773 00 00 00 00 00 00 00 00
774 00 00 00 00 00 00 00 00
775 00 00 00 00 00 00 00 00
776 00 00 00 00 00 00 00 00
777 00 00 00 00 00 00 00 00
778 00 00 00 00 00 00 00 00
779
780 00 00 00 00 00 00 00 00
781 00 00 00 00 00 00 00 00
782 00 00 00 00 00 00 00 00
783 00 00 00 00 00 00 00 00
784 00 00 00 00 00 00 00 00
785 00 00 00 00 00 00 00 00
786 00 00 00 00 00 00 00 00
787 00 00 00 00 00 00 00 00
788
789 00 00 00 00 00 00 00 00
790 00 00 00 00 00 00 00 00
791 00 00 00 00 00 00 00 00
792
793 fe fe
794 00 00
795 00 00
796 -----------------------------------------------------------
797 NVRAM layout details
798
799 NVRAM Address 0x000-0x0ff not used
800 0x100-0x26f initialised data
801 0x270-0x7ff not used
802
803 general layout
804
805 header - 6 bytes,
806 data - 356 bytes (checksum is byte sum of this data)
807 trailer - 6 bytes
808 ---
809 total 368 bytes
810
811 data area layout
812
813 controller set up - 20 bytes
814 boot configuration - 56 bytes (4x14 bytes)
815 device set up - 128 bytes (16x8 bytes)
816 unused (spare?) - 152 bytes (19x8 bytes)
817 ---
818 total 356 bytes
819
820 -----------------------------------------------------------
821 header
822
823 00 00 - ?? start marker
824 64 01 - byte count (lsb/msb excludes header/trailer)
825 8e 0b - checksum (lsb/msb excludes header/trailer)
826 -----------------------------------------------------------
827 controller set up
828
829 00 30 00 00 00 00 07 00 00 00 00 00 00 00 07 04 10 04 00 00
830 | | | |
831 | | | -- host ID
832 | | |
833 | | --Removable Media Support
834 | | 0x00 = none
835 | | 0x01 = Bootable Device
836 | | 0x02 = All with Media
837 | |
838 | --flag bits 2
839 | 0x00000001= scan order hi->low
840 | (default 0x00 - scan low->hi)
841 --flag bits 1
842 0x00000001 scam enable
843 0x00000010 parity enable
844 0x00000100 verbose boot msgs
845
846 remaining bytes unknown - they do not appear to change in my
847 current set up for any of the controllers.
848
849 default set up is identical for 53c810a and 53c875 NVRAM
850 (Removable Media added Symbios BIOS version 4.09)
851 -----------------------------------------------------------
852 boot configuration
853
854 boot order set by order of the devices in this table
855
856 04 00 0f 00 00 10 00 50 00 00 01 00 00 62 -- 1st controller
857 04 00 03 00 00 10 00 58 00 00 01 00 00 63 2nd controller
858 04 00 01 00 00 10 00 48 00 00 01 00 00 61 3rd controller
859 00 00 00 00 00 00 00 00 00 00 00 00 00 00 4th controller
860 | | | | | | | |
861 | | | | | | ---- PCI io port adr
862 | | | | | --0x01 init/scan at boot time
863 | | | | --PCI device/function number (0xdddddfff)
864 | | ----- ?? PCI vendor ID (lsb/msb)
865 ----PCI device ID (lsb/msb)
866
867 ?? use of this data is a guess but seems reasonable
868
869 remaining bytes unknown - they do not appear to change in my
870 current set up
871
872 default set up is identical for 53c810a and 53c875 NVRAM
873 -----------------------------------------------------------
874 device set up (up to 16 devices - includes controller)
875
876 0f 00 08 08 64 00 0a 00 - id 0
877 0f 00 08 08 64 00 0a 00
878 0f 00 08 08 64 00 0a 00
879 0f 00 08 08 64 00 0a 00
880 0f 00 08 08 64 00 0a 00
881 0f 00 08 08 64 00 0a 00
882 0f 00 08 08 64 00 0a 00
883 0f 00 08 08 64 00 0a 00
884
885 0f 00 08 08 64 00 0a 00
886 0f 00 08 08 64 00 0a 00
887 0f 00 08 08 64 00 0a 00
888 0f 00 08 08 64 00 0a 00
889 0f 00 08 08 64 00 0a 00
890 0f 00 08 08 64 00 0a 00
891 0f 00 08 08 64 00 0a 00
892 0f 00 08 08 64 00 0a 00 - id 15
893 | | | | | |
894 | | | | ----timeout (lsb/msb)
895 | | | --synch period (0x?? 40 Mtrans/sec- fast 40) (probably 0x28)
896 | | | (0x30 20 Mtrans/sec- fast 20)
897 | | | (0x64 10 Mtrans/sec- fast )
898 | | | (0xc8 5 Mtrans/sec)
899 | | | (0x00 asynchronous)
900 | | -- ?? max sync offset (0x08 in NVRAM on 53c810a)
901 | | (0x10 in NVRAM on 53c875)
902 | --device bus width (0x08 narrow)
903 | (0x10 16 bit wide)
904 --flag bits
905 0x00000001 - disconnect enabled
906 0x00000010 - scan at boot time
907 0x00000100 - scan luns
908 0x00001000 - queue tags enabled
909
910 remaining bytes unknown - they do not appear to change in my
911 current set up
912
913 ?? use of this data is a guess but seems reasonable
914 (but it could be max bus width)
915
916 default set up for 53c810a NVRAM
917 default set up for 53c875 NVRAM - bus width - 0x10
918 - sync offset ? - 0x10
919 - sync period - 0x30
920 -----------------------------------------------------------
921 ?? spare device space (32 bit bus ??)
922
923 00 00 00 00 00 00 00 00 (19x8bytes)
924 .
925 .
926 00 00 00 00 00 00 00 00
927
928 default set up is identical for 53c810a and 53c875 NVRAM
929 -----------------------------------------------------------
930 trailer
931
932 fe fe - ? end marker ?
933 00 00
934 00 00
935
936 default set up is identical for 53c810a and 53c875 NVRAM
937 -----------------------------------------------------------
938
939
940
941 17.3 Tekram NVRAM layout
942
943 nvram 64x16 (1024 bit)
944
945 Drive settings
946
947 Drive ID 0-15 (addr 0x0yyyy0 = device setup, yyyy = ID)
948 (addr 0x0yyyy1 = 0x0000)
949
950 x x x x x x x x x x x x x x x x
951 | | | | | | | | |
952 | | | | | | | | ----- parity check 0 - off
953 | | | | | | | | 1 - on
954 | | | | | | | |
955 | | | | | | | ------- sync neg 0 - off
956 | | | | | | | 1 - on
957 | | | | | | |
958 | | | | | | --------- disconnect 0 - off
959 | | | | | | 1 - on
960 | | | | | |
961 | | | | | ----------- start cmd 0 - off
962 | | | | | 1 - on
963 | | | | |
964 | | | | -------------- tagged cmds 0 - off
965 | | | | 1 - on
966 | | | |
967 | | | ---------------- wide neg 0 - off
968 | | | 1 - on
969 | | |
970 --------------------------- sync rate 0 - 10.0 Mtrans/sec
971 1 - 8.0
972 2 - 6.6
973 3 - 5.7
974 4 - 5.0
975 5 - 4.0
976 6 - 3.0
977 7 - 2.0
978 7 - 2.0
979 8 - 20.0
980 9 - 16.7
981 a - 13.9
982 b - 11.9
983
984 Global settings
985
986 Host flags 0 (addr 0x100000, 32)
987
988 x x x x x x x x x x x x x x x x
989 | | | | | | | | | | | |
990 | | | | | | | | ----------- host ID 0x00 - 0x0f
991 | | | | | | | |
992 | | | | | | | ----------------------- support for 0 - off
993 | | | | | | | > 2 drives 1 - on
994 | | | | | | |
995 | | | | | | ------------------------- support drives 0 - off
996 | | | | | | > 1Gbytes 1 - on
997 | | | | | |
998 | | | | | --------------------------- bus reset on 0 - off
999 | | | | | power on 1 - on
1000 | | | | |
1001 | | | | ----------------------------- active neg 0 - off
1002 | | | | 1 - on
1003 | | | |
1004 | | | -------------------------------- imm seek 0 - off
1005 | | | 1 - on
1006 | | |
1007 | | ---------------------------------- scan luns 0 - off
1008 | | 1 - on
1009 | |
1010 -------------------------------------- removable 0 - disable
1011 as BIOS dev 1 - boot device
1012 2 - all
1013
1014 Host flags 1 (addr 0x100001, 33)
1015
1016 x x x x x x x x x x x x x x x x
1017 | | | | | |
1018 | | | --------- boot delay 0 - 3 sec
1019 | | | 1 - 5
1020 | | | 2 - 10
1021 | | | 3 - 20
1022 | | | 4 - 30
1023 | | | 5 - 60
1024 | | | 6 - 120
1025 | | |
1026 --------------------------- max tag cmds 0 - 2
1027 1 - 4
1028 2 - 8
1029 3 - 16
1030 4 - 32
1031
1032 Host flags 2 (addr 0x100010, 34)
1033
1034 x x x x x x x x x x x x x x x x
1035 |
1036 ----- F2/F6 enable 0 - off ???
1037 1 - on ???
1038
1039 checksum (addr 0x111111)
1040
1041 checksum = 0x1234 - (sum addr 0-63)
1042
1043 ----------------------------------------------------------------------------
1044
1045 default nvram data:
1046
1047 0x0037 0x0000 0x0037 0x0000 0x0037 0x0000 0x0037 0x0000
1048 0x0037 0x0000 0x0037 0x0000 0x0037 0x0000 0x0037 0x0000
1049 0x0037 0x0000 0x0037 0x0000 0x0037 0x0000 0x0037 0x0000
1050 0x0037 0x0000 0x0037 0x0000 0x0037 0x0000 0x0037 0x0000
1051
1052 0x0f07 0x0400 0x0001 0x0000 0x0000 0x0000 0x0000 0x0000
1053 0x0000 0x0000 0x0000 0x0000 0x0000 0x0000 0x0000 0x0000
1054 0x0000 0x0000 0x0000 0x0000 0x0000 0x0000 0x0000 0x0000
1055 0x0000 0x0000 0x0000 0x0000 0x0000 0x0000 0x0000 0xfbbc
1056
1057
1058 ===============================================================================
1059 End of Linux SYM-2 driver documentation file