203 lines
8.2 KiB
Text
203 lines
8.2 KiB
Text
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UPDATE NEWS: version 1.33 - 26 Aug 98
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Interrupt management in this driver has become, over
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time, increasingly odd and difficult to explain - this
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has been mostly due to my own mental inadequacies. In
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recent kernels, it has failed to function at all when
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compiled for SMP. I've fixed that problem, and after
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taking a fresh look at interrupts in general, greatly
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reduced the number of places where they're fiddled
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with. Done some heavy testing and it looks very good.
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The driver now makes use of the __initfunc() and
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__initdata macros to save about 4k of kernel memory.
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Once again, the same code works for both 2.0.xx and
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2.1.xx kernels.
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UPDATE NEWS: version 1.32 - 28 Mar 98
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Removed the check for legal IN2000 hardware versions:
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It appears that the driver works fine with serial
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EPROMs (the 8-pin chip that defines hardware rev) as
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old as 2.1, so we'll assume that all cards are OK.
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UPDATE NEWS: version 1.31 - 6 Jul 97
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Fixed a bug that caused incorrect SCSI status bytes to be
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returned from commands sent to LUN's greater than 0. This
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means that CDROM changers work now! Fixed a bug in the
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handling of command-line arguments when loaded as a module.
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Also put all the header data in in2000.h where it belongs.
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There are no longer any differences between this driver in
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the 2.1.xx source tree and the 2.0.xx tree, as of 2.0.31
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and 2.1.45 (or is it .46?) - this makes things much easier
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for me...
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UPDATE NEWS: version 1.30 - 14 Oct 96
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Fixed a bug in the code that sets the transfer direction
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bit (DESTID_DPD in the WD_DESTINATION_ID register). There
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are quite a few SCSI commands that do a write-to-device;
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now we deal with all of them correctly. Thanks to Joerg
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Dorchain for catching this one.
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UPDATE NEWS: version 1.29 - 24 Sep 96
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The memory-mapped hardware on the card is now accessed via
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the 'readb()' and 'readl()' macros - required by the new
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memory management scheme in the 2.1.x kernel series.
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As suggested by Andries Brouwer, 'bios_param()' no longer
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forces an artificial 1023 track limit on drives. Also
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removed some kludge-code left over from struggles with
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older (buggy) compilers.
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UPDATE NEWS: version 1.28 - 07 May 96
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Tightened up the "interrupts enabled/disabled" discipline
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in 'in2000_queuecommand()' and maybe 1 or 2 other places.
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I _think_ it may have been a little too lax, causing an
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occasional crash during full moon. A fully functional
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/proc interface is now in place - if you want to play
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with it, start by doing 'cat /proc/scsi/in2000/0'. You
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can also use it to change a few run-time parameters on
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the fly, but it's mostly for debugging. The curious
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should take a good look at 'in2000_proc_info()' in the
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in2000.c file to get an understanding of what it's all
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about; I figure that people who are really into it will
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want to add features suited to their own needs...
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Also, sync is now DISABLED by default.
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UPDATE NEWS: version 1.27 - 10 Apr 96
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Fixed a well-hidden bug in the adaptive-disconnect code
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that would show up every now and then during extreme
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heavy loads involving 2 or more simultaneously active
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devices. Thanks to Joe Mack for keeping my nose to the
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grindstone on this one.
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UPDATE NEWS: version 1.26 - 07 Mar 96
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1.25 had a nasty bug that bit people with swap partitions
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and tape drives. Also, in my attempt to guess my way
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through Intel assembly language, I made an error in the
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inline code for IO writes. Made a few other changes and
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repairs - this version (fingers crossed) should work well.
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UPDATE NEWS: version 1.25 - 05 Mar 96
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Kernel 1.3.70 interrupt mods added; old kernels still OK.
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Big help from Bill Earnest and David Willmore on speed
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testing and optimizing: I think there's a real improvement
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in this area.
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New! User-friendly command-line interface for LILO and
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module loading - the old method is gone, so you'll need
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to read the comments for 'setup_strings' near the top
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of in2000.c. For people with CDROM's or other devices
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that have a tough time with sync negotiation, you can
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now selectively disable sync on individual devices -
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search for the 'nosync' keyword in the command-line
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comments. Some of you disable the BIOS on the card, which
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caused the auto-detect function to fail; there is now a
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command-line option to force detection of a ROM-less card.
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UPDATE NEWS: version 1.24a - 24 Feb 96
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There was a bug in the synchronous transfer code. Only
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a few people downloaded before I caught it - could have
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been worse.
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UPDATE NEWS: version 1.24 - 23 Feb 96
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Lots of good changes. Advice from Bill Earnest resulted
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in much better detection of cards, more efficient usage
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of the fifo, and (hopefully) faster data transfers. The
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jury is still out on speed - I hope it's improved some.
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One nifty new feature is a cool way of doing disconnect/
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reselect. The driver defaults to what I'm calling
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'adaptive disconnect' - meaning that each command is
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evaluated individually as to whether or not it should be
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run with the option to disconnect/reselect (if the device
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chooses), or as a "SCSI-bus-hog". When several devices
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are operating simultaneously, disconnects are usually an
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advantage. In a single device system, or if only 1 device
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is being accessed, transfers usually go faster if disconnects
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are not allowed.
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The default arguments (you get these when you don't give an 'in2000'
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command-line argument, or you give a blank argument) will cause
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the driver to do adaptive disconnect, synchronous transfers, and a
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minimum of debug messages. If you want to fool with the options,
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search for 'setup_strings' near the top of the in2000.c file and
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check the 'hostdata->args' section in in2000.h - but be warned! Not
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everything is working yet (some things will never work, probably).
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I believe that disabling disconnects (DIS_NEVER) will allow you
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to choose a LEVEL2 value higher than 'L2_BASIC', but I haven't
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spent a lot of time testing this. You might try 'ENABLE_CLUSTERING'
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to see what happens: my tests showed little difference either way.
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There's also a define called 'DEFAULT_SX_PER'; this sets the data
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transfer speed for the asynchronous mode. I've put it at 500 ns
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despite the fact that the card could handle settings of 376 or
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252, because higher speeds may be a problem with poor quality
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cables or improper termination; 500 ns is a compromise. You can
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choose your own default through the command-line with the
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'period' keyword.
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------------------------------------------------
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*********** DIP switch settings **************
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------------------------------------------------
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sw1-1 sw1-2 BIOS address (hex)
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-----------------------------------------
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off off C8000 - CBFF0
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on off D8000 - DBFF0
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off on D0000 - D3FF0
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on on BIOS disabled
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sw1-3 sw1-4 IO port address (hex)
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------------------------------------
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off off 220 - 22F
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on off 200 - 20F
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off on 110 - 11F
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on on 100 - 10F
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sw1-5 sw1-6 sw1-7 Interrupt
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------------------------------
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off off off 15
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off on off 14
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off off on 11
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off on on 10
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on - - disabled
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sw1-8 function depends on BIOS version. In earlier versions this
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controlled synchronous data transfer support for MSDOS:
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off = disabled
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on = enabled
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In later ROMs (starting with 01.3 in April 1994) sw1-8 controls
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the "greater than 2 disk drive" feature that first appeared in
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MSDOS 5.0 (ignored by Linux):
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off = 2 drives maximum
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on = 7 drives maximum
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sw1-9 Floppy controller
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--------------------------
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off disabled
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on enabled
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------------------------------------------------
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I should mention that Drew Eckhardt's 'Generic NCR5380' sources
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were my main inspiration, with lots of reference to the IN2000
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driver currently distributed in the kernel source. I also owe
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much to a driver written by Hamish Macdonald for Linux-m68k(!).
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And to Eric Wright for being an ALPHA guinea pig. And to Bill
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Earnest for 2 tons of great input and information. And to David
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Willmore for extensive 'bonnie' testing. And to Joe Mack for
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continual testing and feedback.
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John Shifflett jshiffle@netcom.com
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