BETA AIC7870.ADD for OS/2 Warp ------------------------------- This is a BETA driver that users having problems loading the AIC7870.ADD included with OS/2 Warp may find useful, if their system has a non-compliant system BIOS. The only difference between this BETA and the version released with OS/2 WARP is that this driver has /PCIHW switch which enables this driver to ignore the PCI BIOS and access the PCI hardware registers directly. BASEDEV=AIC7870.ADD /PCIHW Any issues/comments can be directed to VASPI_BETA on the Adaptec BBS or to vaspi@adaptex.cirr.com via the Internet. Generic command line switches for Adaptec drivers and OS/2 2.X and above ======================================================================== OS/2 adapter device drivers (.ADD files) are normally installed automatically and require no further information from the user. However, in certain situations the user may wish to modify the behavior of the driver to meet their specific needs. ***** IMPORTANT ***** Please proceed cautiously with the following information. If you have purchased software which requires you to use switches, it should include instructions on how to use them. Most software requires no switches and you do not need to concern yourself with the information about switch settings. The standard format for command line switches is : BASEDEV=AIC7870.ADD [Universal Parameter][Adapter ID][Unit Parameter] {[SCSI Target ID]} [Universal Parameter] - An option that applies to all adapters controlled by the driver. [Adapter ID] - /A:n, where n is the number (zero relative) of the adapter installed in the system. The adapter ID is determined when the driver is loaded based on the order that adapters are found in the system. (See below, AIC7870.ADD Specific Command Line Switches.) [Unit Parameter] - Modifies the behavior of the selected host adapter. [SCSI Target ID] - The targets to which the Unit Parameter will be applied. This parameter may be a single ID (d) or list of IDs (d,d,d). Universal Parameters -------------------- /ET - Allow embedded targets. This parameter indicates that the ADD should assume that all targets have more than one logical unit (LUN) defined. /!ET - Do not allow embedded targets (DEFAULT). This parameter indicates that the ADD should assume that all targets have only one logical unit (LUN) defined. /PCIHW - Enables driver to access PCI configuration hardware registers. This switch is implemented because in some PCI systems accessing PCI configuration space through PCI BIOS function calls causes problems. /V - Load driver verbosely. This parameter will display the driver name as well as the version number and Adaptec copyright if the driver loads successfully. Information on all targets found in the system will also be displayed. General Unit Parameters ----------------------- /I - Ignore the specified adapter. This allows another driver to share the adapters that the ADD would normally use. /DM - Enable DASD manager support (DEFAULT). This parameter allows OS2DASD.DMD to control the specified target(s) if they are identified as DASD (hard disk) devices. /!DM - Disable DASD manager support. This parameter prevents OS2DASD.DMD from controlling the specified target(s). /SM - Enable SCSI manager support (DEFAULT). This parameter allows OS2SCSI.DMD to control the specified target(s) if they are identified as NON-DASD SCSI devices. All SCSI hard drives will be controlled by OS2DASD.DMD. /!SM - Disable SCSI manager support. This parameter prevents OS2SCSI.DMD from controlling the specified target(s). Configuration Examples ---------------------- Example 1 Suppose that you had a removable hard drive as target 3 and you wanted to control the hard drive with an ASPI application and driver. Normally OS2DASD will allocate this device, treat it as a large floppy and prevent you from sending any SCSI commands via ASPI. BASEDEV=AIC7870.ADD /A:0 /!DM:3 will prevent OS2DASD.DMD from accessing the target and still allow OS2SCSI.DMD and OS2ASPI.DMD to share access to it. Example 2 Suppose that you had a multi-disk CD-ROM as target 4 on host adapter 0 and two DASD devices as targets 1 and 5 on host adapter 1. BASEDEV=AIC7870.ADD /ET /A:0 /!SM:4 /A:1 /!DM:1,5 will prevent OS2SCSI.DMD from accessing the CD-ROM and prevent OS2DASD.DMD from controlling the DASD devices. The driver will also search for multiple LUNs on all host adapters. Important Tips -------------- 1) There are no switches for controlling OS2ASPI.DMD directly. IBM did not define them in their specification and we cannot be sure that other host adapters will have the same switches. 2) OS2SCSI.DMD will only allocate devices when a device driver requests it, but this will prevent OS2ASPI from accessing it. There is nothing in the ASPI specification regarding device allocation so OS2ASPI must rely on other managers to fairly share targets. This should only be a problem if you have two drivers that use different managers and you want them both to access the same target at the same time. 3) Do NOT disable DASD manager access to target 0 if you are booting from your SCSI host adapter. This will prevent the system from booting! AIC7870.ADD-specific command line switches ========================================== This driver supports the AIC-7870 installed on an AHA-2940 PCI host adapter. Adapter numbers are first assigned to boards with their BIOS enabled; the numbers are assigned from lowest BIOS address to highest address. Any remaining boards are assigned numbers by scanning slots. Each slot is a combination of a bus number and a device number pair starting from lowest to higest numbers, and the adapters are assigned a number in the order they are found. Special Unit Parameters: ------------------------ /TAG: - Sets the number (1-16) of tagged commands for all target devices on the host adapter. A value of one disables tagged queuing. 16 is the maximum number allowed and 8 is the default value. /TAG:1 Disables tagged queuing for all target devices on a given host adapter. The driver maintains a maximum of 2 non- tagged commands per target internally. The driver treats all target devices as non-tagged devices, and sends only one command at a time per target to the host adapter. Example: BASEDEV=AIC7870.ADD /A:0 /TAG:8 will set the number of tagged commands for all target devices on the first host adapter to 8.