linux/Documentation/scsi/ChangeLog.ncr53c8xx
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   1Sat May 12 12:00 2001 Gerard Roudier (groudier@club-internet.fr)
   2        * version ncr53c8xx-3.4.3b
   3        - Ensure LEDC bit in GPCNTL is cleared when reading the NVRAM.
   4          Fix sent by Stig Telfer <stig@api-networks.com>.
   5        - Define scsi_set_pci_device() as nil for kernel < 2.4.4.
   6
   7Mon Feb 12 22:30 2001 Gerard Roudier (groudier@club-internet.fr)
   8        * version ncr53c8xx-3.4.3
   9        - Call pci_enable_device() as AC wants this to be done.
  10        - Get both the BAR cookies actual and PCI BAR values.
  11          (see Changelog.sym53c8xx rev. 1.7.3 for details)
  12        - Merge changes for linux-2.4 that declare the host template 
  13          in the driver object also when the driver is statically 
  14          linked with the kernel.
  15
  16Sun Sep 24 21:30 2000 Gerard Roudier (groudier@club-internet.fr)
  17        * version ncr53c8xx-3.4.2
  18        - See Changelog.sym53c8xx, driver version 1.7.2.
  19
  20Wed Jul 26 23:30 2000 Gerard Roudier (groudier@club-internet.fr)
  21        * version ncr53c8xx-3.4.1
  22        - Provide OpenFirmware path through the proc FS on PPC.
  23        - Remove trailing argument #2 from a couple of #undefs.
  24
  25Sun Jul 09 16:30 2000 Gerard Roudier (groudier@club-internet.fr)
  26        * version ncr53c8xx-3.4.0
  27        - Remove the PROFILE C and SCRIPTS code.
  28          This facility was not this useful and thus was not longer 
  29          desirable given the increasing complexity of the driver code.
  30        - Merges from FreeBSD sym-1.6.2 driver:
  31          * Clarify memory barriers needed by the driver for architectures 
  32            that implement a weak memory ordering.
  33        - General cleanup:
  34          Move definitions for barriers and IO/MMIO operations to the 
  35          sym53c8xx_defs.h header files. They are now shared by the 
  36          both drivers.
  37          Use SCSI_NCR_IOMAPPED instead of NCR_IOMAPPED.
  38
  39Thu May 11   12:30 2000 Pam Delaney (pam.delaney@lsil.com)
  40        * revision 3.3b
  41 
  42Mon Apr 24 12:00 2000 Gerard Roudier (groudier@club-internet.fr)
  43        * revision 3.2i
  44        - Return value 1 (instead of 0) from the driver setup routine.
  45        - Let the driver also attach controllers that have been set to 
  46          OFF in the NVRAM as it did prior to revision 3.2g.
  47
  48Sat Apr 1  12:00 2000 Gerard Roudier (groudier@club-internet.fr)
  49        * revision 3.2h
  50        - Fix a compilation problem on Alpha introduced in version 3.2g.
  51          (`port' changed to `base_io').
  52        - Move from `sym' to this driver a tiny change for __sparc__ that 
  53          applies to cache line size (? Probably from David S Miller).
  54        - Make sure no data transfer will happen for Scsi_Cmnd requests 
  55          that supply SCSI_DATA_NONE direction (this avoids some BUG() 
  56          statement in the PCI code when a data buffer is also supplied).
  57
  58Thu Mar 16   9:30 2000 Pam Delaney (pam.delaney@lsil.com)
  59        * revision 3.3b-3
  60        - Added exclusion for the 53C1010 and 53C1010_66 chips
  61          to the driver (change to sym53c8xx_comm.h).
  62
  63Mon March 6  23:15 2000 Gerard Roudier (groudier@club-internet.fr)
  64        * revision 3.2g
  65        - Add the file sym53c8xx_comm.h that collects code that should 
  66          be shared by sym53c8xx and ncr53c8xx drivers. For now, it is  
  67          a header file that is only included by the ncr53c8xx driver, 
  68          but things will be cleaned up later. This code addresses 
  69          notably:
  70          * Chip detection and PCI related initialisations
  71          * NVRAM detection and reading
  72          * DMA mapping
  73          * Boot setup command
  74          * And some other ...
  75        - Add support for the new dynamic dma mapping kernel interface.
  76          Requires Linux-2.3.47 (tested with pre-2.3.47-6).
  77        - Get data transfer direction from the scsi command structure 
  78          (Scsi_Cmnd) when this information is available.
  79
  80Mon March 6  23:15 2000 Gerard Roudier (groudier@club-internet.fr)
  81        * revision 3.2g
  82        - Add the file sym53c8xx_comm.h that collects code that should
  83          be shared by sym53c8xx and ncr53c8xx drivers. For now, it is
  84          a header file that is only included by the ncr53c8xx driver,
  85          but things will be cleaned up later. This code addresses
  86          notably:
  87          * Chip detection and PCI related initialisations
  88          * NVRAM detection and reading
  89          * DMA mapping
  90          * Boot setup command
  91          * And some other ...
  92        - Add support for the new dynamic dma mapping kernel interface.
  93          Requires Linux-2.3.47 (tested with pre-2.3.47-6).
  94        - Get data transfer direction from the scsi command structure
  95          (Scsi_Cmnd) when this information is available.
  96
  97Fri Jan 14 14:00 2000 Pam Delaney (pam.delaney@lsil.com)
  98        * revision pre-3.3b-1
  99        - Merge parallel driver series 3.31 and 3.2e 
 100
 101Tue Jan 11 14:00 2000 Pam Delaney (pam.delaney@lsil.com)
 102        * revision 3.31
 103        - Added support for mounting disks on wide-narrow-wide
 104          scsi configurations.  
 105        - Built off of version 3.30
 106
 107Mon Jan 10 13:30 2000 Pam Delaney (pam.delaney@lsil.com)
 108        * revision 3.30
 109        - Added capability to use the integrity checking code
 110          in the kernel (optional).
 111        - Disabled support for the 53C1010.
 112        - Built off of version 3.2c
 113
 114Sat Jan 8  22:00 2000 Gerard Roudier (groudier@club-internet.fr)
 115        * revision 3.2e
 116        - Add year 2000 copyright.
 117        - Display correctly bus signals when bus is detected wrong.
 118        - Remove the dead code that broke driver 3.2d.
 119
 120Mon Dec 6  22:00 1999 Gerard Roudier (groudier@club-internet.fr)
 121        * revision 3.2d
 122        - Change messages written by the driver at initialisation and 
 123          through the /proc FS (rather cosmetic changes that consist in
 124          printing out the PCI bus number and device/function).
 125        - Get rid of the old PCI bios interface, but preserve kernel 2.0 
 126          compatibility from a simple wrapper.
 127        - Remove the compilation condition about having to acquire the 
 128          io_request_lock since it seems to be a definite feature now.:)
 129        - proc_dir structure no longer needed for kernel >= 2.3.27.
 130        - Change the driver detection code by the sym53c8xx one, modulo 
 131          some minor changes. The driver can now attach any number of 
 132          controllers (>40) and does no longer hoger stack space at 
 133          initialisation.
 134        - Definitely disable overlapped PCI arbitration for all dual 
 135          function chips, since I cannot make sure for what chip revisions 
 136          it is actually safe.
 137        - Add support for the SYM53C1510D.
 138        - Update the poor Tekram sync factor table.
 139        - Remove the compilation condition about having to acquire the 
 140          io_request_lock since it seems to be a definite feature now.:)
 141        - proc_dir structure no longer needed for kernel >= 2.3.27.
 142
 143Sat Sep 11  18:00 1999 Gerard Roudier (groudier@club-internet.fr)
 144        * revision 3.2c
 145        - Handle correctly (hopefully) jiffies wrap-around.
 146        - Restore the entry used to detect 875 until revision 0xff.
 147          (I removed it inadvertently, it seems :) )
 148        - Replace __initfunc() which is deprecated stuff by __init which 
 149          is not yet so. ;-)
 150        - Add support of some 'resource handling' for linux-2.3.13.
 151          Basically the BARs have been changed to something more complex 
 152          in the pci_dev structure.
 153        - Remove some deprecated code.
 154
 155Sat May 10  11:00 1999 Gerard Roudier (groudier@club-internet.fr)
 156        * revision pre-3.2b-1
 157        - Support for the 53C895A by Pamela Delaney <pam.delaney@lsil.com>
 158          The 53C895A contains all of the features of the 896 but has only 
 159          one channel and has a 32 bit PCI bus. It does 64 bit PCI addressing 
 160          using dual cycle PCI data transfers.
 161        - Miscellaneous minor fixes.
 162        - Some additions to the README.ncr53c8xx file.
 163
 164Sun Apr 11  10:00 1999 Gerard Roudier (groudier@club-internet.fr)
 165        * revision 3.2a
 166        - Add 'hostid:#id' boot option. This option allows to change the 
 167          default SCSI id the driver uses for controllers.
 168        - Remove nvram layouts and driver set-up structures from the C source,
 169          and use the one defined in sym53c8xx_defs.h file.
 170          (shared by both drivers).
 171        - Set for now MAX LUNS to 16 (instead of 8).
 172
 173Thu Mar 11  23:00 1999 Gerard Roudier (groudier@club-internet.fr)
 174        * revision 3.2    (8xx-896 driver bundle)
 175        - Only define the host template in ncr53c8xx.h and include the 
 176          sym53c8xx_defs.h file.
 177        - Declare static all symbols that do not need to be visible from 
 178          outside the driver code.
 179        - Add 'excl' boot command option that allows to pass to the driver 
 180          io address of devices not to attach.
 181        - Add info() function called from the host template to print 
 182          driver/host information.
 183        - Minor documentation additions.
 184
 185Sat Mar 6  11:00 1999 Gerard Roudier (groudier@club-internet.fr)
 186        * revision 3.1h
 187        - Fix some oooold bug that hangs the bus if a device rejects a 
 188          negotiation. Btw, the corresponding stuff also needed some cleanup 
 189          and thus the change is a bit larger than it could have been.
 190        - Still some typo that made compilation fail for 64 bit (trivial fix).
 191
 192Sun Feb  14:00 1999 Gerard Roudier (groudier@club-internet.fr)
 193        * revision 3.1g
 194        - Deal correctly with 64 bit PCI address registers on Linux 2.2.
 195          Pointed out by Leonard Zubkoff.
 196        - Allow to tune request_irq() flags from the boot command line using 
 197          ncr53c8xx=irqm:??, as follows:
 198          a) If bit 0x10 is set in irqm, IRQF_SHARED flag is not used.
 199          b) If bit 0x20 is set in irqm, IRQF_DISABLED flag is not used.
 200          By default the driver uses both IRQF_SHARED and IRQF_DISABLED.
 201          Option 'ncr53c8xx=irqm:0x20' may be used when an IRQ is shared by 
 202          a 53C8XX adapter and a network board.
 203        - Tiny misspelling fixed (ABORT instead of ABRT). Was fortunately 
 204          harmless.
 205        - Negotiate SYNC data transfers with CCS devices.
 206
 207Sat Jan 16  17:30 1999 Gerard Roudier (groudier@club-internet.fr)
 208        * revision 3.1f
 209        - Some PCI fix-ups not needed any more for PPC (from Cort).
 210        - Cache line size set to 16 DWORDS for Sparc   (from DSM).
 211        - Waiting list look-up didn't work for the first command of the list.
 212        - Remove 2 useless lines of code.
 213
 214Sun Dec 13  18:00 1998 Gerard Roudier (groudier@club-internet.fr)
 215        * revision 3.1e
 216        - Same work-around as for the 53c876 rev <= 0x15 for 53c896 rev 1:
 217          Disable overlapped arbitration. This will not make difference 
 218          since the chip has on-chip RAM.
 219
 220Thu Nov 26  22:00 1998 Gerard Roudier (groudier@club-internet.fr)
 221        * revision 3.1d
 222        - The SISL RAID change requires now remap_pci_mem() stuff to be 
 223          compiled for __i386__ when normal IOs are used.
 224        - Minor spelling fixes in doc files.
 225
 226Sat Nov 21  18:00 1998 Gerard Roudier (groudier@club-internet.fr)
 227        * revision 3.1c
 228        - Ignore chips that are driven by SISL RAID (DAC 960).
 229          Change sent by Leonard Zubkoff and slightly reworked.
 230        - Still a buglet in the tags initial settings that needed to be fixed.
 231          It was not possible to disable TGQ at system startup for devices 
 232          that claim TGQ support. The driver used at least 2 for the queue 
 233          depth but did'nt keep track of user settings for tags depth lower 
 234          than 2.
 235
 236Wed Nov 11  10:00 1998 Gerard Roudier (groudier@club-internet.fr)
 237        * revision 3.1b
 238        - The driver was unhappy when configured with default_tags > MAX_TAGS
 239          Hopefully doubly-fixed.
 240        - Update the Configure.help driver section that speaks of TAGS.
 241
 242Wed Oct 21 21:00 1998 Gerard Roudier (groudier@club-internet.fr)
 243        * revision 3.1a
 244        - Changes from Eddie Dost for Sparc and Alpha:
 245          ioremap/iounmap support for Sparc.
 246          pcivtophys changed to bus_dvma_to_phys.
 247        - Add the 53c876 description to the chip table. This is only useful 
 248          for printing the right name of the controller.
 249        - DEL-441 Item 2 work-around for the 53c876 rev <= 5 (0x15).
 250        - Add additional checking of INQUIRY data:
 251          Check INQUIRY data received length is at least 7. Byte 7 of 
 252          inquiry data contains device features bits and the driver might 
 253          be confused by garbage. Also check peripheral qualifier.
 254        - Cleanup of the SCSI tasks management:
 255          Remove the special case for 32 tags. Now the driver only uses the 
 256          scheme that allows up to 64 tags per LUN.
 257          Merge some code from the 896 driver.
 258          Use a 1,3,5,...MAXTAGS*2+1 tag numbering. Previous driver could  
 259          use any tag number from 1 to 253 and some non conformant devices  
 260          might have problems with large tag numbers.
 261        - 'no_sync' changed to 'no_disc' in the README file. This is an old 
 262          and trivial mistake that seems to demonstrate the README file is 
 263          not often read. :)
 264
 265Sun Oct  4 14:00 1998 Gerard Roudier (groudier@club-internet.fr)
 266        * revision 3.0i
 267        - Cosmetic changes for sparc (but not for the driver) that needs  
 268          __irq_itoa() to be used for printed IRQ value to be understandable.
 269        - Some problems with the driver that didn't occur using driver 2.5f 
 270          were due to a SCSI selection problem triggered by a clearly 
 271          documented feature that in fact seems not to work: (53C8XX chips  
 272          are claimed by the manuals to be able to execute SCSI scripts just 
 273          after abitration while the SCSI core is performing SCSI selection).
 274          This optimization is broken and has been removed.
 275        - Some broken scsi devices are confused when a negotiation is started 
 276          on a LUN that does not correspond to a real device. According to 
 277          SCSI specs, this is a device firmware bug. This has been worked 
 278          around by only starting negotiation if the LUN has previously be 
 279          used for at least 1 successful SCSI command.
 280        - The 'last message sent' printed out on M_REJECT message reception 
 281          was read from the SFBR i/o register after the previous message had 
 282          been sent. 
 283          This was not correct and affects all previous driver versions and 
 284          the original FreeBSD one as well. The SCSI scripts has been fixed 
 285          so that it now provides the right information to the C code.
 286
 287Sat Jul 18 13:00 1998 Gerard Roudier (groudier@club-internet.fr)
 288        * revision 3.0g
 289        - Preliminary fixes for Big Endian (sent by Eddie C. Dost).
 290          Big Endian architectures should work again with the driver.
 291          Eddie's patch has been partially applied since current 2.1.109 
 292          does not have all the Sparc changes of the vger tree.
 293        - Use of BITS_PER_LONG instead of (~0UL == 0xffffffffUL) has fixed
 294          the problem observed when the driver was compiled using EGCS or 
 295          PGCC.
 296
 297Mon Jul 13 20:00 1998 Gerard Roudier (groudier@club-internet.fr)
 298        * revision 3.0f
 299        - Some spelling fixes.
 300        - linux/config.h misplaced in ncr53c8xx.h
 301        - MODULE_PARM stuff added for linux 2.1.
 302        - check INQUIRY response data format is exactly 2. 
 303        - use BITS_PER_LONG if defined. 
 304
 305Sun Jun 28 12:00 1998 Gerard Roudier (groudier@club-internet.fr)
 306        * revision 3.0e
 307        - Some cleanup, spelling fixes, version checks, documentations 
 308          changes, etc ...
 309
 310Sat Jun 20 20:00 1998 Gerard Roudier (groudier@club-internet.fr)
 311        * revision 3.0c
 312        - Add a boot setup option that allows to set up device queue depths 
 313          at boot-up. This option is very useful since Linux does not 
 314          allow to change scsi device queue depth once the system has been 
 315          booted up.
 316
 317Sun Jun 15 23:00 1998 Gerard Roudier (groudier@club-internet.fr)
 318        * revision 3.0a
 319        - Support for up to 64 TAGS per LUN.
 320        - Rewrite the TARGET vs LUN capabilities management.
 321          CmdQueue is now handled as a LUN capability as it shall be.
 322          This also fixes a bug triggered when disabling tagged command 
 323          queuing for a device that had this feature enabled.
 324        - Remove the ncr_opennings() stuff that was useless under Linux 
 325          and hard to understand to me.
 326        - Add "setverbose" procfs driver command. It allows to tune 
 327          verbose level after boot-up. Setting this level to zero, for 
 328          example avoid flooding the syslog file.
 329        - Add KERN_XXX to some printk's.
 330
 331Tue Jun 10 23:00 1998 Gerard Roudier (groudier@club-internet.fr)
 332        * revision 3.0
 333        - Linux config changes for 2.0.34:
 334          Remove NVRAM detection config option. This option is now enabled 
 335          by default but can be disabled by editing the driver header file.
 336          Add a PROFILE config option.
 337        - Update Configure.help
 338        - Add calls to new function mdelay() for milli-seconds delay if 
 339          kernel version >= 2.1.105.
 340        - Replace all printf(s) by printk(s). After all, the ncr53c8xx is 
 341          a driver for Linux.
 342        - Perform auto-sense on COMMAND TERMINATED. Not sure it is useful.
 343        - Some other minor changes.
 344
 345Tue Jun 4 23:00 1998 Gerard Roudier (groudier@club-internet.fr)
 346        * revision 2.6n
 347        - Code cleanup and simplification:
 348          Remove kernel 1.2.X and 1.3.X support.
 349          Remove the _old_ target capabilities table.
 350          Remove the error recovery code that have'nt been really useful.
 351          Use a single alignment boundary (CACHE_LINE_SIZE) for data 
 352          structures.
 353        - Several aggressive SCRIPTS optimizations and changes:
 354          Reselect SCRIPTS code rewritten.
 355          Support for selection/reselection without ATN.
 356          And some others.
 357        - Miscallaneous changes in the C code:
 358          Count actual number of CCB queued to the controller (future use).
 359          Lots of other minor changes.
 360
 361Wed May 13 20:00 1998 Gerard Roudier (groudier@club-internet.fr)
 362        * revision 2.6m
 363        - Problem of missed SCSI bus reset with the 53C895 fixed by 
 364          Richard Waltham. The 53C895 needs about 650 us for the bus 
 365          mode to settle. Delays used while resetting the controller 
 366          and the bus have been adjusted. Thanks Richard!
 367        - Some simplification for 64 bit arch done ccb address testing.
 368        - Add a check of the MSG_OUT phase after Selection with ATN.
 369        - The new tagged queue stuff seems ok, so some informationnal 
 370          message have been conditionned by verbose >= 3.
 371        - Donnot reset if a SBMC interrupt reports the same bus mode.
 372        - Print out the whole driver set-up. Some options were missing and 
 373          the print statement was misplaced for modules.
 374        - Ignore a SCSI parity interrupt if the chip is not connected to 
 375          the SCSI bus.
 376
 377Sat May 1 16:00 1998 Gerard Roudier (groudier@club-internet.fr)
 378        * revision 2.6l
 379        - Add CCB done queue support for Alpha and perhaps some other 
 380          architectures.
 381        - Add some barriers to enforce memory ordering for x86 and 
 382          Alpha architectures.
 383        - Fix something that looks like an old bug in the nego SIR 
 384          interrupt code in case of negotiation failure.
 385
 386Sat Apr 25 21:00 1998 Gerard Roudier (groudier@club-internet.fr)
 387        * revision 2.6k
 388        - Remove all accesses to the on-chip RAM from the C code:
 389          Use SCRIPTS to load the on-chip RAM.
 390          Use SCRIPTS to repair the start queue on selection timeout.
 391          Use the copy of script in main memory to calculate the chip 
 392          context on phase mismatch.
 393        - The above allows now to use the on-chip RAM without requiring 
 394          to get access to the on-chip RAM from the C code. This makes 
 395          on-chip RAM useable for linux-1.2.13 and for Linux-Alpha for 
 396          instance.
 397        - Some simplifications and cleanups in the SCRIPTS and C code.
 398        - Buglet fixed in parity error recovery SCRIPTS (never tested).
 399        - Minor updates in README.ncr53c8xx.
 400
 401Wed Apr 15 21:00 1998 Gerard Roudier (groudier@club-internet.fr)
 402        * revision 2.6j
 403        - Incorporate changes from linux-2.1.95 ncr53c8xx driver version.
 404        - Add SMP support for linux-2.1.95 and above.
 405        - Fix a bug when QUEUE FULL is returned and no commands are 
 406          disconnected. This happens with Atlas I / L912 and may happen 
 407          with Atlas II / LXY4.
 408        - Nail another one on CHECK condition when requeuing the command 
 409          for auto-sense.
 410        - Call scsi_done() for all completed commands after interrupt 
 411          handling.
 412        - Increase the done queue to 24 entries.
 413
 414Sat Apr 4 20:00 1998 Gerard Roudier (groudier@club-internet.fr)
 415        * revision 2.6i
 416        - CTEST0 is used by the 53C885 for Power Management and 
 417          priority setting between the 2 functions.
 418          Use SDID instead as actual target number. Just have had to 
 419          overwrite it with SSID on reselection.
 420        - Split DATA_IN and DATA_OUT scripts into 2 sub-scripts.
 421          64 segments are moved from on-chip RAM scripts.
 422          If more segments, a script in main memory is used for the 
 423          additional segments.
 424        - Since the SCRIPTS processor continues SCRIPTS execution after 
 425          having won arbitration, do some stuff prior to testing any SCSI 
 426          phase on reselection. This should have the vertue to process 
 427          scripts in parallel with the SCSI core performing selection.
 428        - Increase the done queue to 12 entries.
 429
 430Sun Mar 29 12:00 1998 Gerard Roudier (groudier@club-internet.fr)
 431        * revision 2.6h
 432        - Some fixes.
 433
 434Tue Mar 26 23:00 1998 Gerard Roudier (groudier@club-internet.fr)
 435        * revision 2.6g
 436        - New done queue. 8 entries by default (6 always useable).
 437          Can be increased if needed.
 438        - Resources management using doubly linked queues.
 439        - New auto-sense and QUEUE FULL handling that does not need to 
 440          stall the NCR queue any more.
 441        - New CCB starvation avoiding algorithm.
 442        - Prepare CCBs for SCSI commands that cannot be queued, instead of 
 443          inserting these commands into the waiting list. The waiting list 
 444          is now only used while resetting and when memory for CCBs is not 
 445          yet available?
 446
 447Sun Feb 8 22:00 1998 Gerard Roudier (groudier@club-internet.fr)
 448        * revision 2.6f
 449        - Some fixes in order to really support the 53C895, at least with 
 450          FAST-20 devices.
 451        - Heavy changes in the target/lun resources management to allow 
 452          the scripts to jump directly to the CCB on reselection instead 
 453          of walking on the lun CCBs list. Up to 32 tags per lun are now 
 454          supported without script processor and PCI traffic overhead.
 455
 456Sun Jan 11 22:00 1998 Gerard Roudier (groudier@club-internet.fr)
 457        * revision 2.6d
 458        - new (different ?) implementation of the start queue:
 459          Use a simple CALL to a launch script in the CCB.
 460        - implement a minimal done queue (1 entry :-) ).
 461          this avoid scanning all CCBs on INT FLY (Only scan all CCBs, on 
 462          overflow). Hit ratio is better than 99.9 % on my system, so no 
 463          need to have a larger done queue.
 464        - generalization of the restart of CCB on special condition as 
 465          Abort, QUEUE FULL, CHECK CONDITION.
 466          This has been called 'silly scheduler'.
 467        - make all the profiling code conditionned by a config option.
 468          This spare some PCI traffic and C code when this feature is not 
 469          needed.
 470        - handle more cleanly the situation where direction is unknown.
 471          The pointers patching is now performed by the SCRIPTS processor.
 472        - remove some useless scripts instructions.
 473
 474        Ported from driver 2.5 series:
 475        ------------------------------
 476        - Use FAST-5 instead of SLOW for slow scsi devices according to 
 477          new SPI-2 draft.
 478        - Make some changes in order to accommodate with 875 rev <= 3 
 479          device errata listing 397. Minor consequences are:
 480          . Leave use of PCI Write and Invalidate under user control.
 481            Now, by default the driver does not enable PCI MWI and option
 482            'specf:y' is required in order to enable this feature.
 483          . Memory Read Line is not enabled for 875 and 875-like chips.
 484          . Programmed burst length set to 64 DWORDS (instead of 128).
 485            (Note: SYMBIOS uses 32 DWORDS for the SDMS BIOS)
 486        - Add 'buschk' boot option.
 487          This option enables checking of SCSI BUS data lines after SCSI 
 488          RESET (set by default). (Submitted by Richard Waltham).
 489        - Update the README file.
 490        - Dispatch CONDITION MET and RESERVATION CONFLICT scsi status 
 491          as OK driver status.
 492        - Update the README file and the Symbios NVRAM format definition 
 493          with removable media flags values (available with SDMS 4.09).
 494        - Several PCI configuration registers fix-ups for powerpc.
 495          (Patch sent by Cort).
 496
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