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aha - Adaptec SCSI host adapter driver



      aha - Adaptec SCSI host adapter driver


      To compile this driver into the kernel, place the following lines in your
      kernel configuration file:
            device scbus
            device aha
      Alternatively, to load the driver as a module at boot time, place the
      following line in loader.conf(5):
      In /boot/device.hints:"isa"


      This driver provides access to the SCSI bus connected to the Adaptec
      AHA-154x and AHA-1640 SCSI host adapters.  x is 0 for controllers without
      a floppy drive and 2 for controllers that have them.  For optimum perfor‐
      mance, Adaptec AHA-174x controllers should be configured in enhanced mode
      and attached via the ahb(4) driver.
      One device hint entry for every card to be attached by the system is
      required.  Specific values for the port address, IRQ, and DRQ may be
      specified.  If wildcard values are used, the driver will query the device
      for its current settings and use those.  If the port address is a wild‐
      card, the driver consults an internal table of possible port address
      locations and attaches to the first unattached card it finds.  The possi‐
      ble port addresses for this card are 0x330, 0x334, 0x230, 0x234, 0x130,
      and 0x134.
      The AHA-1640 is an MCA bus card.  Since the MCA bus is a self-identifying
      bus, no setting of hints is required.


      The aha driver supports the following SCSI host adapters:
            Adaptec AHA-154xB
            Adaptec AHA-154xC
            Adaptec AHA-154xCF
            Adaptec AHA-154xCP
            Adaptec AHA-1640
            Adaptec AHA-174x in 154x emulation mode
            DTC 3290 SCSI controller in 1542 emulation mode
            Tekram SCSI controllers in 154x emulation mode
      ahb(4), ahc(4), aic(4), cd(4), da(4), sa(4), scsi(4)


      The aha driver was ported by M. Warner Losh from the bt driver written by
      Justin T. Gibbs.


      The AHA-154xA card does not support residuals on data transfers.  As a
      result, this card is no longer supported.
      There have been some reports that the AHA-154xB does not work well under
      heavy load.
      The AHA-154xCP is a plug and play controller.  However, its resources are
      set using the on-board BIOS and cannot be moved.  Failures to attached
      for this card are often caused when the resources set in the BIOS con‐


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