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+ BusLogic MultiMaster and FlashPoint SCSI Driver for Linux
+ Version 2.0.15 for Linux 2.0
+ Version 2.1.15 for Linux 2.1
+ PRODUCTION RELEASE
+ 17 August 1998
+ Leonard N. Zubkoff
+ Dandelion Digital
+ Copyright 1995-1998 by Leonard N. Zubkoff <firstname.lastname@example.org>
+BusLogic, Inc. designed and manufactured a variety of high performance SCSI
+host adapters which share a common programming interface across a diverse
+collection of bus architectures by virtue of their MultiMaster ASIC technology.
+BusLogic was acquired by Mylex Corporation in February 1996, but the products
+supported by this driver originated under the BusLogic name and so that name is
+retained in the source code and documentation.
+This driver supports all present BusLogic MultiMaster Host Adapters, and should
+support any future MultiMaster designs with little or no modification. More
+recently, BusLogic introduced the FlashPoint Host Adapters, which are less
+costly and rely on the host CPU, rather than including an onboard processor.
+Despite not having an onboard CPU, the FlashPoint Host Adapters perform very
+well and have very low command latency. BusLogic has recently provided me with
+the FlashPoint Driver Developer's Kit, which comprises documentation and freely
+redistributable source code for the FlashPoint SCCB Manager. The SCCB Manager
+is the library of code that runs on the host CPU and performs functions
+analogous to the firmware on the MultiMaster Host Adapters. Thanks to their
+having provided the SCCB Manager, this driver now supports the FlashPoint Host
+Adapters as well.
+My primary goals in writing this completely new BusLogic driver for Linux are
+to achieve the full performance that BusLogic SCSI Host Adapters and modern
+SCSI peripherals are capable of, and to provide a highly robust driver that can
+be depended upon for high performance mission critical applications. All of
+the major performance features can be configured from the Linux kernel command
+line or at module initialization time, allowing individual installations to
+tune driver performance and error recovery to their particular needs.
+The latest information on Linux support for BusLogic SCSI Host Adapters, as
+well as the most recent release of this driver and the latest firmware for the
+BT-948/958/958D, will always be available from my Linux Home Page at URL
+Bug reports should be sent via electronic mail to "email@example.com". Please
+include with the bug report the complete configuration messages reported by the
+driver and SCSI subsystem at startup, along with any subsequent system messages
+relevant to SCSI operations, and a detailed description of your system's
+Mylex has been an excellent company to work with and I highly recommend their
+products to the Linux community. In November 1995, I was offered the
+opportunity to become a beta test site for their latest MultiMaster product,
+the BT-948 PCI Ultra SCSI Host Adapter, and then again for the BT-958 PCI Wide
+Ultra SCSI Host Adapter in January 1996. This was mutually beneficial since
+Mylex received a degree and kind of testing that their own testing group cannot
+readily achieve, and the Linux community has available high performance host
+adapters that have been well tested with Linux even before being brought to
+market. This relationship has also given me the opportunity to interact
+directly with their technical staff, to understand more about the internal
+workings of their products, and in turn to educate them about the needs and
+potential of the Linux community.
+More recently, Mylex has reaffirmed the company's interest in supporting the
+Linux community, and I am now working on a Linux driver for the DAC960 PCI RAID
+Controllers. Mylex's interest and support is greatly appreciated.
+Unlike some other vendors, if you contact Mylex Technical Support with a
+problem and are running Linux, they will not tell you that your use of their
+products is unsupported. Their latest product marketing literature even states
+"Mylex SCSI host adapters are compatible with all major operating systems
+including: ... Linux ...".
+Mylex Corporation is located at 34551 Ardenwood Blvd., Fremont, California
+94555, USA and can be reached at 510/796-6100 or on the World Wide Web at
+http://www.mylex.com. Mylex HBA Technical Support can be reached by electronic
+mail at firstname.lastname@example.org, by Voice at 510/608-2400, or by FAX at 510/745-7715.
+Contact information for offices in Europe and Japan is available on the Web
+ DRIVER FEATURES
+o Configuration Reporting and Testing
+ During system initialization, the driver reports extensively on the host
+ adapter hardware configuration, including the synchronous transfer parameters
+ requested and negotiated with each target device. AutoSCSI settings for
+ Synchronous Negotiation, Wide Negotiation, and Disconnect/Reconnect are
+ reported for each target device, as well as the status of Tagged Queuing.
+ If the same setting is in effect for all target devices, then a single word
+ or phrase is used; otherwise, a letter is provided for each target device to
+ indicate the individual status. The following examples
+ should clarify this reporting format:
+ Synchronous Negotiation: Ultra
+ Synchronous negotiation is enabled for all target devices and the host
+ adapter will attempt to negotiate for 20.0 mega-transfers/second.
+ Synchronous Negotiation: Fast
+ Synchronous negotiation is enabled for all target devices and the host
+ adapter will attempt to negotiate for 10.0 mega-transfers/second.
+ Synchronous Negotiation: Slow
+ Synchronous negotiation is enabled for all target devices and the host
+ adapter will attempt to negotiate for 5.0 mega-transfers/second.
+ Synchronous Negotiation: Disabled
+ Synchronous negotiation is disabled and all target devices are limited to
+ asynchronous operation.
+ Synchronous Negotiation: UFSNUUU#UUUUUUUU
+ Synchronous negotiation to Ultra speed is enabled for target devices 0
+ and 4 through 15, to Fast speed for target device 1, to Slow speed for
+ target device 2, and is not permitted to target device 3. The host
+ adapter's SCSI ID is represented by the "#".
+ The status of Wide Negotiation, Disconnect/Reconnect, and Tagged Queuing
+ are reported as "Enabled", Disabled", or a sequence of "Y" and "N" letters.
+o Performance Features
+ BusLogic SCSI Host Adapters directly implement SCSI-2 Tagged Queuing, and so
+ support has been included in the driver to utilize tagged queuing with any
+ target devices that report having the tagged queuing capability. Tagged
+ queuing allows for multiple outstanding commands to be issued to each target
+ device or logical unit, and can improve I/O performance substantially. In
+ addition, BusLogic's Strict Round Robin Mode is used to optimize host adapter
+ performance, and scatter/gather I/O can support as many segments as can be
+ effectively utilized by the Linux I/O subsystem. Control over the use of
+ tagged queuing for each target device as well as individual selection of the
+ tagged queue depth is available through driver options provided on the kernel
+ command line or at module initialization time. By default, the queue depth
+ is determined automatically based on the host adapter's total queue depth and
+ the number, type, speed, and capabilities of the target devices found. In
+ addition, tagged queuing is automatically disabled whenever the host adapter
+ firmware version is known not to implement it correctly, or whenever a tagged
+ queue depth of 1 is selected. Tagged queuing is also disabled for individual
+ target devices if disconnect/reconnect is disabled for that device.
+o Robustness Features
+ The driver implements extensive error recovery procedures. When the higher
+ level parts of the SCSI subsystem request that a timed out command be reset,
+ a selection is made between a full host adapter hard reset and SCSI bus reset
+ versus sending a bus device reset message to the individual target device
+ based on the recommendation of the SCSI subsystem. Error recovery strategies
+ are selectable through driver options individually for each target device,
+ and also include sending a bus device reset to the specific target device
+ associated with the command being reset, as well as suppressing error
+ recovery entirely to avoid perturbing an improperly functioning device. If
+ the bus device reset error recovery strategy is selected and sending a bus
+ device reset does not restore correct operation, the next command that is
+ reset will force a full host adapter hard reset and SCSI bus reset. SCSI bus
+ resets caused by other devices and detected by the host adapter are also
+ handled by issuing a soft reset to the host adapter and re-initialization.
+ Finally, if tagged queuing is active and more than one command reset occurs
+ in a 10 minute interval, or if a command reset occurs within the first 10
+ minutes of operation, then tagged queuing will be disabled for that target
+ device. These error recovery options improve overall system robustness by
+ preventing individual errant devices from causing the system as a whole to
+ lock up or crash, and thereby allowing a clean shutdown and restart after the
+ offending component is removed.
+o PCI Configuration Support
+ On PCI systems running kernels compiled with PCI BIOS support enabled, this
+ driver will interrogate the PCI configuration space and use the I/O port
+ addresses assigned by the system BIOS, rather than the ISA compatible I/O
+ port addresses. The ISA compatible I/O port address is then disabled by the
+ driver. On PCI systems it is also recommended that the AutoSCSI utility be
+ used to disable the ISA compatible I/O port entirely as it is not necessary.
+ The ISA compatible I/O port is disabled by default on the BT-948/958/958D.
+o /proc File System Support
+ Copies of the host adapter configuration information together with updated
+ data transfer and error recovery statistics are available through the
+ /proc/scsi/BusLogic/<N> interface.
+o Shared Interrupts Support
+ On systems that support shared interrupts, any number of BusLogic Host
+ Adapters may share the same interrupt request channel.
+ SUPPORTED HOST ADAPTERS
+The following list comprises the supported BusLogic SCSI Host Adapters as of
+the date of this document. It is recommended that anyone purchasing a BusLogic
+Host Adapter not in the following table contact the author beforehand to verify
+that it is or will be supported.
+FlashPoint Series PCI Host Adapters:
+FlashPoint LT (BT-930) Ultra SCSI-3
+FlashPoint LT (BT-930R) Ultra SCSI-3 with RAIDPlus
+FlashPoint LT (BT-920) Ultra SCSI-3 (BT-930 without BIOS)
+FlashPoint DL (BT-932) Dual Channel Ultra SCSI-3
+FlashPoint DL (BT-932R) Dual Channel Ultra SCSI-3 with RAIDPlus
+FlashPoint LW (BT-950) Wide Ultra SCSI-3
+FlashPoint LW (BT-950R) Wide Ultra SCSI-3 with RAIDPlus
+FlashPoint DW (BT-952) Dual Channel Wide Ultra SCSI-3
+FlashPoint DW (BT-952R) Dual Channel Wide Ultra SCSI-3 with RAIDPlus
+MultiMaster "W" Series Host Adapters:
+BT-948 PCI Ultra SCSI-3
+BT-958 PCI Wide Ultra SCSI-3
+BT-958D PCI Wide Differential Ultra SCSI-3
+MultiMaster "C" Series Host Adapters:
+BT-946C PCI Fast SCSI-2
+BT-956C PCI Wide Fast SCSI-2
+BT-956CD PCI Wide Differential Fast SCSI-2
+BT-445C VLB Fast SCSI-2
+BT-747C EISA Fast SCSI-2
+BT-757C EISA Wide Fast SCSI-2
+BT-757CD EISA Wide Differential Fast SCSI-2
+BT-545C ISA Fast SCSI-2
+BT-540CF ISA Fast SCSI-2
+MultiMaster "S" Series Host Adapters:
+BT-445S VLB Fast SCSI-2
+BT-747S EISA Fast SCSI-2
+BT-747D EISA Differential Fast SCSI-2
+BT-757S EISA Wide Fast SCSI-2
+BT-757D EISA Wide Differential Fast SCSI-2
+BT-545S ISA Fast SCSI-2
+BT-542D ISA Differential Fast SCSI-2
+BT-742A EISA SCSI-2 (742A revision H)
+BT-542B ISA SCSI-2 (542B revision H)
+MultiMaster "A" Series Host Adapters:
+BT-742A EISA SCSI-2 (742A revisions A - G)
+BT-542B ISA SCSI-2 (542B revisions A - G)
+AMI FastDisk Host Adapters that are true BusLogic MultiMaster clones are also
+supported by this driver.
+BusLogic SCSI Host Adapters are available packaged both as bare boards and as
+retail kits. The BT- model numbers above refer to the bare board packaging.
+The retail kit model numbers are found by replacing BT- with KT- in the above
+list. The retail kit includes the bare board and manual as well as cabling and
+driver media and documentation that are not provided with bare boards.
+ FLASHPOINT INSTALLATION NOTES
+o RAIDPlus Support
+ FlashPoint Host Adapters now include RAIDPlus, Mylex's bootable software
+ RAID. RAIDPlus is not supported on Linux, and there are no plans to support
+ it. The MD driver in Linux 2.0 provides for concatenation (LINEAR) and
+ striping (RAID-0), and support for mirroring (RAID-1), fixed parity (RAID-4),
+ and distributed parity (RAID-5) is available separately. The built-in Linux
+ RAID support is generally more flexible and is expected to perform better
+ than RAIDPlus, so there is little impetus to include RAIDPlus support in the
+ BusLogic driver.
+o Enabling UltraSCSI Transfers
+ FlashPoint Host Adapters ship with their configuration set to "Factory
+ Default" settings that are conservative and do not allow for UltraSCSI speed
+ to be negotiated. This results in fewer problems when these host adapters
+ are installed in systems with cabling or termination that is not sufficient
+ for UltraSCSI operation, or where existing SCSI devices do not properly
+ respond to synchronous transfer negotiation for UltraSCSI speed. AutoSCSI
+ may be used to load "Optimum Performance" settings which allow UltraSCSI
+ speed to be negotiated with all devices, or UltraSCSI speed can be enabled on
+ an individual basis. It is recommended that SCAM be manually disabled after
+ the "Optimum Performance" settings are loaded.
+ BT-948/958/958D INSTALLATION NOTES
+The BT-948/958/958D PCI Ultra SCSI Host Adapters have some features which may
+require attention in some circumstances when installing Linux.
+o PCI I/O Port Assignments
+ When configured to factory default settings, the BT-948/958/958D will only
+ recognize the PCI I/O port assignments made by the motherboard's PCI BIOS.
+ The BT-948/958/958D will not respond to any of the ISA compatible I/O ports
+ that previous BusLogic SCSI Host Adapters respond to. This driver supports
+ the PCI I/O port assignments, so this is the preferred configuration.
+ However, if the obsolete BusLogic driver must be used for any reason, such as
+ a Linux distribution that does not yet use this driver in its boot kernel,
+ BusLogic has provided an AutoSCSI configuration option to enable a legacy ISA
+ compatible I/O port.
+ To enable this backward compatibility option, invoke the AutoSCSI utility via
+ Ctrl-B at system startup and select "Adapter Configuration", "View/Modify
+ Configuration", and then change the "ISA Compatible Port" setting from
+ "Disable" to "Primary" or "Alternate". Once this driver has been installed,
+ the "ISA Compatible Port" option should be set back to "Disable" to avoid
+ possible future I/O port conflicts. The older BT-946C/956C/956CD also have
+ this configuration option, but the factory default setting is "Primary".
+o PCI Slot Scanning Order
+ In systems with multiple BusLogic PCI Host Adapters, the order in which the
+ PCI slots are scanned may appear reversed with the BT-948/958/958D as
+ compared to the BT-946C/956C/956CD. For booting from a SCSI disk to work
+ correctly, it is necessary that the host adapter's BIOS and the kernel agree
+ on which disk is the boot device, which requires that they recognize the PCI
+ host adapters in the same order. The motherboard's PCI BIOS provides a
+ standard way of enumerating the PCI host adapters, which is used by the Linux
+ kernel. Some PCI BIOS implementations enumerate the PCI slots in order of
+ increasing bus number and device number, while others do so in the opposite
+ Unfortunately, Microsoft decided that Windows 95 would always enumerate the
+ PCI slots in order of increasing bus number and device number regardless of
+ the PCI BIOS enumeration, and requires that their scheme be supported by the
+ host adapter's BIOS to receive Windows 95 certification. Therefore, the
+ factory default settings of the BT-948/958/958D enumerate the host adapters
+ by increasing bus number and device number. To disable this feature, invoke
+ the AutoSCSI utility via Ctrl-B at system startup and select "Adapter
+ Configuration", "View/Modify Configuration", press Ctrl-F10, and then change
+ the "Use Bus And Device # For PCI Scanning Seq." option to OFF.
+ This driver will interrogate the setting of the PCI Scanning Sequence option
+ so as to recognize the host adapters in the same order as they are enumerated
+ by the host adapter's BIOS.
+o Enabling UltraSCSI Transfers
+ The BT-948/958/958D ship with their configuration set to "Factory Default"
+ settings that are conservative and do not allow for UltraSCSI speed to be
+ negotiated. This results in fewer problems when these host adapters are
+ installed in systems with cabling or termination that is not sufficient for
+ UltraSCSI operation, or where existing SCSI devices do not properly respond
+ to synchronous transfer negotiation for UltraSCSI speed. AutoSCSI may be
+ used to load "Optimum Performance" settings which allow UltraSCSI speed to be
+ negotiated with all devices, or UltraSCSI speed can be enabled on an
+ individual basis. It is recommended that SCAM be manually disabled after the
+ "Optimum Performance" settings are loaded.
+ DRIVER OPTIONS
+BusLogic Driver Options may be specified either via the Linux Kernel Command
+Line or via the Loadable Kernel Module Installation Facility. Driver Options
+for multiple host adapters may be specified either by separating the option
+strings by a semicolon, or by specifying multiple "BusLogic=" strings on the
+command line. Individual option specifications for a single host adapter are
+separated by commas. The Probing and Debugging Options apply to all host
+adapters whereas the remaining options apply individually only to the
+selected host adapter.
+The BusLogic Driver Probing Options comprise the following:
+ The "IO:" option specifies an ISA I/O Address to be probed for a non-PCI
+ MultiMaster Host Adapter. If neither "IO:" nor "NoProbeISA" options are
+ specified, then the standard list of BusLogic MultiMaster ISA I/O Addresses
+ will be probed (0x330, 0x334, 0x230, 0x234, 0x130, and 0x134). Multiple
+ "IO:" options may be specified to precisely determine the I/O Addresses to
+ be probed, but the probe order will always follow the standard list.
+ The "NoProbe" option disables all probing and therefore no BusLogic Host
+ Adapters will be detected.
+ The "NoProbeISA" option disables probing of the standard BusLogic ISA I/O
+ Addresses and therefore only PCI MultiMaster and FlashPoint Host Adapters
+ will be detected.
+ The "NoProbePCI" options disables the interrogation of PCI Configuration
+ Space and therefore only ISA Multimaster Host Adapters will be detected, as
+ well as PCI Multimaster Host Adapters that have their ISA Compatible I/O
+ Port set to "Primary" or "Alternate".
+ The "NoSortPCI" option forces PCI MultiMaster Host Adapters to be
+ enumerated in the order provided by the PCI BIOS, ignoring any setting of
+ the AutoSCSI "Use Bus And Device # For PCI Scanning Seq." option.
+ The "MultiMasterFirst" option forces MultiMaster Host Adapters to be probed
+ before FlashPoint Host Adapters. By default, if both FlashPoint and PCI
+ MultiMaster Host Adapters are present, this driver will probe for
+ FlashPoint Host Adapters first unless the BIOS primary disk is controlled
+ by the first PCI MultiMaster Host Adapter, in which case MultiMaster Host
+ Adapters will be probed first.
+ The "FlashPointFirst" option forces FlashPoint Host Adapters to be probed
+ before MultiMaster Host Adapters.
+The BusLogic Driver Tagged Queuing Options allow for explicitly specifying
+the Queue Depth and whether Tagged Queuing is permitted for each Target
+Device (assuming that the Target Device supports Tagged Queuing). The Queue
+Depth is the number of SCSI Commands that are allowed to be concurrently
+presented for execution (either to the Host Adapter or Target Device). Note
+that explicitly enabling Tagged Queuing may lead to problems; the option to
+enable or disable Tagged Queuing is provided primarily to allow disabling
+Tagged Queuing on Target Devices that do not implement it correctly. The
+following options are available:
+ The "QueueDepth:" or QD:" option specifies the Queue Depth to use for all
+ Target Devices that support Tagged Queuing, as well as the maximum Queue
+ Depth for devices that do not support Tagged Queuing. If no Queue Depth
+ option is provided, the Queue Depth will be determined automatically based
+ on the Host Adapter's Total Queue Depth and the number, type, speed, and
+ capabilities of the detected Target Devices. For Host Adapters that
+ require ISA Bounce Buffers, the Queue Depth is automatically set by default
+ to BusLogic_TaggedQueueDepthBB or BusLogic_UntaggedQueueDepthBB to avoid
+ excessive preallocation of DMA Bounce Buffer memory. Target Devices that
+ do not support Tagged Queuing always have their Queue Depth set to
+ BusLogic_UntaggedQueueDepth or BusLogic_UntaggedQueueDepthBB, unless a
+ lower Queue Depth option is provided. A Queue Depth of 1 automatically
+ disables Tagged Queuing.
+ The "QueueDepth:[...]" or "QD:[...]" option specifies the Queue Depth
+ individually for each Target Device. If an <integer> is omitted, the
+ associated Target Device will have its Queue Depth selected automatically.
+ The "TaggedQueuing:Default" or "TQ:Default" option permits Tagged Queuing
+ based on the firmware version of the BusLogic Host Adapter and based on
+ whether the Queue Depth allows queuing multiple commands.
+ The "TaggedQueuing:Enable" or "TQ:Enable" option enables Tagged Queuing for
+ all Target Devices on this Host Adapter, overriding any limitation that
+ would otherwise be imposed based on the Host Adapter firmware version.
+ The "TaggedQueuing:Disable" or "TQ:Disable" option disables Tagged Queuing
+ for all Target Devices on this Host Adapter.
+ The "TaggedQueuing:<Target-Spec>" or "TQ:<Target-Spec>" option controls
+ Tagged Queuing individually for each Target Device. <Target-Spec> is a
+ sequence of "Y", "N", and "X" characters. "Y" enables Tagged Queuing, "N"
+ disables Tagged Queuing, and "X" accepts the default based on the firmware
+ version. The first character refers to Target Device 0, the second to
+ Target Device 1, and so on; if the sequence of "Y", "N", and "X" characters
+ does not cover all the Target Devices, unspecified characters are assumed
+ to be "X".
+The BusLogic Driver Miscellaneous Options comprise the following:
+ The "BusSettleTime:" or "BST:" option specifies the Bus Settle Time in
+ seconds. The Bus Settle Time is the amount of time to wait between a Host
+ Adapter Hard Reset which initiates a SCSI Bus Reset and issuing any SCSI
+ Commands. If unspecified, it defaults to BusLogic_DefaultBusSettleTime.
+ The "InhibitTargetInquiry" option inhibits the execution of an Inquire
+ Target Devices or Inquire Installed Devices command on MultiMaster Host
+ Adapters. This may be necessary with some older Target Devices that do not
+ respond correctly when Logical Units above 0 are addressed.
+The BusLogic Driver Debugging Options comprise the following:
+ The "TraceProbe" option enables tracing of Host Adapter Probing.
+ The "TraceHardwareReset" option enables tracing of Host Adapter Hardware
+ The "TraceConfiguration" option enables tracing of Host Adapter
+ The "TraceErrors" option enables tracing of SCSI Commands that return an
+ error from the Target Device. The CDB and Sense Data will be printed for
+ each SCSI Command that fails.
+ The "Debug" option enables all debugging options.
+The following examples demonstrate setting the Queue Depth for Target Devices
+1 and 2 on the first host adapter to 7 and 15, the Queue Depth for all Target
+Devices on the second host adapter to 31, and the Bus Settle Time on the
+second host adapter to 30 seconds.
+Linux Kernel Command Line:
+ linux BusLogic=QueueDepth:[,7,15];QueueDepth:31,BusSettleTime:30
+LILO Linux Boot Loader (in /etc/lilo.conf):
+ append = "BusLogic=QueueDepth:[,7,15];QueueDepth:31,BusSettleTime:30"
+INSMOD Loadable Kernel Module Installation Facility:
+ insmod BusLogic.o \
+NOTE: Module Utilities 2.1.71 or later is required for correct parsing
+ of driver options containing commas.
+ DRIVER INSTALLATION
+This distribution was prepared for Linux kernel version 2.0.35, but should be
+compatible with 2.0.4 or any later 2.0 series kernel.
+To install the new BusLogic SCSI driver, you may use the following commands,
+replacing "/usr/src" with wherever you keep your Linux kernel source tree:
+ cd /usr/src
+ tar -xvzf BusLogic-2.0.15.tar.gz
+ mv README.* LICENSE.* BusLogic.[ch] FlashPoint.c linux/drivers/scsi
+ patch -p0 < BusLogic.patch (only for 2.0.33 and below)
+ cd linux
+ make config
+ make zImage
+Then install "arch/i386/boot/zImage" as your standard kernel, run lilo if
+appropriate, and reboot.
+ BUSLOGIC ANNOUNCEMENTS MAILING LIST
+The BusLogic Announcements Mailing List provides a forum for informing Linux
+users of new driver releases and other announcements regarding Linux support
+for BusLogic SCSI Host Adapters. To join the mailing list, send a message to
+"email@example.com" with the line "subscribe" in the