adp(7D) 							      Devices								   adp(7D)

NAME

       adp - Low-level module for controllers based on Adaptec AIC-7870P and AIC-7880P SCSI chips

DESCRIPTION

       The  adp  module  provides  low-level interface routines between the common disk/tape I/O system and SCSI (Small Computer System Interface)
       controllers based on the Adaptec AIC-7870P and AIC-7880P SCSI chips. These controllers include the Adaptec AHA-2940, AHA-2940W,	AHA-2940U,
       AHA-2940UW, AHA-3940, and AHA-3940W, as well as motherboards with embedded AIC-7870P and AIC-7880P SCSI chips.

       Supported devices are AIC-7850, AIC-7860, AIC-7870, AIC-7880 and AIC-7895.

       The  adp  module  can be configured for disk and streaming tape support for one or more host adapter boards, each of which must be the sole
       initiator on a SCSI bus.  Auto-configuration code determines if the adapter is present at the configured address and what types of  devices
       are attached to the adapter.

PRECONFIGURE

       The Plug N Play SCAM Support option is not supported.

   Known Problems and Limitations
	 o  To	use  the AHA-3940 or AHA-3940W adapters, the motherboard must have a BIOS that supports the DEC PCI-to-PCI Bridge chip on the host
	    bus adapter.

	 o  User-level programs have exhibited problems on some PCI systems with an Adaptec AHA-2940 or AHA-2940W card and  certain  motherboards.
	    If	problems  with user-level programs occur, use the BIOS setup to disable write-back CPU caching (or all caching if there is no con-
	    trol over the caching algorithm).  The affected motherboards are:

		 - PCI motherboards with a 60-MHz Pentium chip, with PCI chipset numbers S82433LX Z852 and S82434LX Z850. The part numbers of  the
		 Intel motherboards are AA616393-007 and AA615988-009.

		 - PCI motherboards with a 90-MHz Pentium chip, with PCI chipset numbers S82433NX Z895, S82434NX Z895, and S82434NX Z896. The part
		 number of the Intel motherboard is 541286-005. (Some Gateway 2000 systems use this motherboard.)

		 - AA-619772-002 motherboard with 82433LX Z852 and 82434LX Z882 chips causes random memory inconsistencies. Return the motherboard
		 to the vendor for a replacement.

		   o  If  the  AHA-2940  SCSI adapter does not recognize the Quantum Empire 1080S, HP 3323 SE or other SCSI disk drive, reduce the
		      Synchronous Transfer rate on the Adaptec controller to 8 Mbps.

		   o  The AHA-3940 has been certified by Adaptec to work on specific systems; however, some testing has  shown	that  the  Solaris
		      operating environment works properly in some of those systems and not in others.

CONFIGURATION

       Use the Adaptec configuration utility to perform the following steps:

	 o  Configure  each SCSI device to have a unique SCSI ID, then using the adapter's Advanced Configuration Options setup menu, set the Plug
	    N Play SCAM Support option to Disabled.

	 o  If there is more than one controller (or an embedded controller), try to use one IRQ per controller.

	 o  Enable bus mastering for the slots with your host bus adapters, when the choice is given.

	 o  For older disk drives, tape drives, and most CD-ROM devices, make sure the maximum SCSI data transfer speed is set to 5.0 Mbps.

	 o  Enable support for disks larger than 1 Gbyte if applicable.

FILES

       /kernel/drv/adp.conf    Configuration file for the adp driver; there are no user-configurable options in this file

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Architecture		     |x86			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       attributes(5)

       Solaris (Intel Platform Edition) Hardware Compatibility List

NOTES

       Throughout the release, support of additional devices may be added.  See the Solaris (Intel Platform Edition) Hardware  Compatibility  List
       for additional information.

       The  adp driver supports Logical Unit Number ("LUN") values of 0 through 15. This range exceeds the standard SCSI-2 requirements which call
       for support of LUNs 0 through 7.

SunOS 5.10							    10 Oct 2000 							   adp(7D)