esp(4) Emulex ESP, NCR 53C9x and QLogic FAS families based SCSI controllers


To compile this driver into the kernel, place the following lines in your kernel configuration file:
device scbus device esp

Alternatively, to load the driver as a module at boot time, place the following line in loader.conf5:



The driver provides support for the AMD Am53C974, the Emulex ESP100, ESP100A, ESP200 and ESP406, the NCR 53C90, 53C94 and 53C96 as well as the QLogic FAS100A, FAS216, FAS366 and FAS408 SCSI controller chips found in a wide variety of systems and peripheral boards.


Controllers supported by the driver include:

  • MELCO IFC-DP (PC-98)
  • Sun ESP family
  • Sun FAS family
  • Tekram DC390
  • Tekram DC390T


The driver first appeared in Nx 1.3 . The first Fx version to include it was Fx 5.3 .


An -nosplit The driver was ported to Fx by An Scott Long Aq [email protected] and later on considerably improved by An Marius Strobl Aq [email protected] .


The driver should read the EEPROM settings of Tekram controllers.