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esp(4)

NAME

     esp -- Qlogic FEPS and FAS366 SCSI driver

SYNOPSIS

     device scbus
     device esp

DESCRIPTION

     The esp driver provides support for the Qlogic FAS216 and FAS408 SCSI
     controller chips found in a wide variety of systems and peripheral
     boards.  This includes the Qlogic SCSI cards found in most Sun Ultra 1e
     and Ultra 2 machines.

     For Qlogic PCI SCSI host adapters, the isp(4) driver should be used in
     place of the esp driver.

IMPLEMENTATION NOTES

     During the boot sequence, the esp driver searches the linked list for LUN
     info by LUN ID.  At this point the driver will attach on that instance,
     and then attempt to attach every sub-device.

     There are at least 4 variations of the configuration 3 register.  A sec-
     ond config register must be loaded to inquire the chip revision, other-
     wise the ncr53c9x_reset() function will not set the defaults correctly.

     The drive attach routine attempts to set the appropriate bit to put the
     chip into Fast SCSI mode so that it does not have to be figured out each
     time.  This will then be stored in the NCR registers for later use.

     The esp driver makes use of the LSI 64854 DMA engine which contains three
     independent channels designed to interface with an NCR539X SCSI con-
     troller; an AM7990 Ethernet controller; and certain types of parallel
     port hardware.  As such this driver may eventually replace the amd(4)
     driver for network hardware.

DIAGNOSTICS

     The following driver specific error messages may be reported:

     esp: cannot map %d segments  The device was unable to map segments while
     mapping the SCSI devices in DMA mode.

     unknown variant %d, devices not attached  An unknown version of the card
     was found and devices will not be attached.

     Unhandled function code %d  The device returned a function code which the
     driver is unable to handle, most likely during negotiation.

     esp:%d:%d: selection failed %d left in FIFO  The target left the command
     phase prematurely.  If a command did not reach the device then it will be
     reported as shown above.

     invalid state: %d	The device has reached an invalid state.

SEE ALSO

     amd(4), isp(4), scbus(4), camcontrol(8)

     http://www.qlc.com/
     of porting the original from NetBSD.

BUGS

     The esp driver includes the sbus front-end but lacks the PCI front-end.
     Thus it can only support the FEPS/FAS366 SCSI found in Sun Ultra 1e and
     Ultra 2 machines at this time.

     This driver should eventually replace the amd(4) driver, but that
     requires porting the PCI front-end mentioned above.

FreeBSD 5.4			 July 28, 2004			   FreeBSD 5.4

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