This driver supports the Qlogic FASXXX family of chips.  This driver
  only works with the ISA, VLB, and PCMCIA versions of the Qlogic
  FastSCSI!  cards as well as any other card based on the FASXX chip
  (including the Control Concepts SCSI/IDE/SIO/PIO/FDC cards).
  
  This driver does NOT support the PCI version.  Support for these PCI
  Qlogic boards:
  
  	* IQ-PCI
  	* IQ-PCI-10
  	* IQ-PCI-D

  is provided by the qla1280 driver.

  
  Nor does it support the PCI-Basic, which is supported by the
  'am53c974' driver.
  
  PCMCIA SUPPORT
  
  This currently only works if the card is enabled first from DOS.  This
  means you will have to load your socket and card services, and
  QL41DOS.SYS and QL40ENBL.SYS.  These are a minimum, but loading the
  rest of the modules won't interfere with the operation.  The next
  thing to do is load the kernel without resetting the hardware, which
  can be a simple ctrl-alt-delete with a boot floppy, or by using
  loadlin with the kernel image accessible from DOS.  If you are using
  the Linux PCMCIA driver, you will have to adjust it or otherwise stop
  it from configuring the card.
  
  I am working with the PCMCIA group to make it more flexible, but that
  may take a while.
  
  ALL CARDS
  
  The top of the qlogic.c file has a number of defines that controls
  configuration.  As shipped, it provides a balance between speed and
  function.  If there are any problems, try setting SLOW_CABLE to 1, and
  then try changing USE_IRQ and TURBO_PDMA to zero.  If you are familiar
  with SCSI, there are other settings which can tune the bus.
  
  It may be a good idea to enable RESET_AT_START, especially if the
  devices may not have been just powered up, or if you are restarting
  after a crash, since they may be busy trying to complete the last
  command or something.  It comes up faster if this is set to zero, and
  if you have reliable hardware and connections it may be more useful to
  not reset things.
  
  SOME TROUBLESHOOTING TIPS
  
  Make sure it works properly under DOS.  You should also do an initial FDISK
  on a new drive if you want partitions.
  
  Don't enable all the speedups first.  If anything is wrong, they will make
  any problem worse.
  
  IMPORTANT
  
  The best way to test if your cables, termination, etc. are good is to
  copy a very big file (e.g. a doublespace container file, or a very
  large executable or archive).  It should be at least 5 megabytes, but
  you can do multiple tests on smaller files.  Then do a COMP to verify
  that the file copied properly.  (Turn off all caching when doing these
  tests, otherwise you will test your RAM and not the files).  Then do
  10 COMPs, comparing the same file on the SCSI hard drive, i.e. "COMP
  realbig.doc realbig.doc".  Then do it after the computer gets warm.
  
  I noticed my system which seems to work 100% would fail this test if
  the computer was left on for a few hours.  It was worse with longer
  cables, and more devices on the SCSI bus.  What seems to happen is
  that it gets a false ACK causing an extra byte to be inserted into the
  stream (and this is not detected).  This can be caused by bad
  termination (the ACK can be reflected), or by noise when the chips
  work less well because of the heat, or when cables get too long for
  the speed.
  
  Remember, if it doesn't work under DOS, it probably won't work under
  Linux.