1    Originally,   this  driver  was    written  for the  Digital   Equipment
   2    Corporation series of EtherWORKS Ethernet cards:
   4        DE425 TP/COAX EISA
   5        DE434 TP PCI
   6        DE435 TP/COAX/AUI PCI
   7        DE450 TP/COAX/AUI PCI
   8        DE500 10/100 PCI Fasternet
  10    but it  will  now attempt  to  support all  cards which   conform to the
  11    Digital Semiconductor   SROM   Specification.    The  driver   currently
  12    recognises the following chips:
  14        DC21040  (no SROM) 
  15        DC21041[A]  
  16        DC21140[A] 
  17        DC21142 
  18        DC21143 
  20    So far the driver is known to work with the following cards:
  22        KINGSTON
  23        Linksys
  24        ZNYX342
  25        SMC8432
  26        SMC9332 (w/new SROM)
  27        ZNYX31[45]
  28        ZNYX346 10/100 4 port (can act as a 10/100 bridge!) 
  30    The driver has been tested on a relatively busy network using the DE425,
  31    DE434, DE435 and DE500 cards and benchmarked with 'ttcp': it transferred
  32    16M of data to a DECstation 5000/200 as follows:
  34                TCP           UDP
  35             TX     RX     TX     RX
  36    DE425   1030k  997k   1170k  1128k
  37    DE434   1063k  995k   1170k  1125k
  38    DE435   1063k  995k   1170k  1125k
  39    DE500   1063k  998k   1170k  1125k  in 10Mb/s mode
  41    All  values are typical (in   kBytes/sec) from a  sample  of 4 for  each
  42    measurement. Their error is +/-20k on a quiet (private) network and also
  43    depend on what load the CPU has.
  45    =========================================================================
  47    The ability to load this  driver as a loadable  module has been included
  48    and used extensively  during the driver development  (to save those long
  49    reboot sequences).  Loadable module support  under PCI and EISA has been
  50    achieved by letting the driver autoprobe as if it were compiled into the
  51    kernel. Do make sure  you're not sharing  interrupts with anything  that
  52    cannot accommodate  interrupt  sharing!
  54    To utilise this ability, you have to do 8 things:
  56    0) have a copy of the loadable modules code installed on your system.
  57    1) copy de4x5.c from the  /linux/drivers/net directory to your favourite
  58    temporary directory.
  59    2) for fixed  autoprobes (not  recommended),  edit the source code  near
  60    line 5594 to reflect the I/O address  you're using, or assign these when
  61    loading by:
  63                   insmod de4x5 io=0xghh           where g = bus number
  64                                                        hh = device number   
  66       NB: autoprobing for modules is now supported by default. You may just
  67           use:
  69                   insmod de4x5
  71           to load all available boards. For a specific board, still use
  72           the 'io=?' above.
  73    3) compile  de4x5.c, but include -DMODULE in  the command line to ensure
  74    that the correct bits are compiled (see end of source code).
  75    4) if you are wanting to add a new  card, goto 5. Otherwise, recompile a
  76    kernel with the de4x5 configuration turned off and reboot.
  77    5) insmod de4x5 [io=0xghh]
  78    6) run the net startup bits for your new eth?? interface(s) manually 
  79    (usually /etc/rc.inet[12] at boot time). 
  80    7) enjoy!
  82    To unload a module, turn off the associated interface(s) 
  83    'ifconfig eth?? down' then 'rmmod de4x5'.
  85    Automedia detection is included so that in  principle you can disconnect
  86    from, e.g.  TP, reconnect  to BNC  and  things will still work  (after a
  87    pause whilst the   driver figures out   where its media went).  My tests
  88    using ping showed that it appears to work....
  90    By  default,  the driver will  now   autodetect any  DECchip based card.
  91    Should you have a need to restrict the driver to DIGITAL only cards, you
  92    can compile with a  DEC_ONLY define, or if  loading as a module, use the
  93    'dec_only=1'  parameter. 
  95    I've changed the timing routines to  use the kernel timer and scheduling
  96    functions  so that the  hangs  and other assorted problems that occurred
  97    while autosensing the  media  should be gone.  A  bonus  for the DC21040
  98    auto  media sense algorithm is  that it can now  use one that is more in
  99    line with the  rest (the DC21040  chip doesn't  have a hardware  timer).
 100    The downside is the 1 'jiffies' (10ms) resolution.
 102    IEEE 802.3u MII interface code has  been added in anticipation that some
 103    products may use it in the future.
 105    The SMC9332 card  has a non-compliant SROM  which needs fixing -  I have
 106    patched this  driver to detect it  because the SROM format used complies
 107    to a previous DEC-STD format.
 109    I have removed the buffer copies needed for receive on Intels.  I cannot
 110    remove them for   Alphas since  the  Tulip hardware   only does longword
 111    aligned  DMA transfers  and  the  Alphas get   alignment traps with  non
 112    longword aligned data copies (which makes them really slow). No comment.
 114    I  have added SROM decoding  routines to make this  driver work with any
 115    card that  supports the Digital  Semiconductor SROM spec. This will help
 116    all  cards running the dc2114x  series chips in particular.  Cards using
 117    the dc2104x  chips should run correctly with  the basic  driver.  I'm in
 118    debt to <> for the  testing and feedback that helped get
 119    this feature working.  So far we have  tested KINGSTON, SMC8432, SMC9332
 120    (with the latest SROM complying  with the SROM spec  V3: their first was
 121    broken), ZNYX342  and  LinkSys. ZNYX314 (dual  21041  MAC) and  ZNYX 315
 122    (quad 21041 MAC)  cards also  appear  to work despite their  incorrectly
 123    wired IRQs.
 125    I have added a temporary fix for interrupt problems when some SCSI cards
 126    share the same interrupt as the DECchip based  cards. The problem occurs
 127    because  the SCSI card wants to  grab the interrupt  as a fast interrupt
 128    (runs the   service routine with interrupts turned   off) vs.  this card
 129    which really needs to run the service routine with interrupts turned on.
 130    This driver will  now   add the interrupt service   routine  as  a  fast
 131    interrupt if it   is bounced from the   slow interrupt.  THIS IS NOT   A
 132    RECOMMENDED WAY TO RUN THE DRIVER  and has been done  for a limited time
 133    until  people   sort  out their  compatibility    issues and the  kernel
 134    interrupt  service code  is  fixed.   YOU  SHOULD SEPARATE OUT  THE FAST
 135    INTERRUPT CARDS FROM THE SLOW INTERRUPT CARDS to ensure that they do not
 136    run on the same interrupt. PCMCIA/CardBus is another can of worms...
 138    Finally, I think  I have really  fixed  the module  loading problem with
 139    more than one DECchip based  card.  As a  side effect, I don't mess with
 140    the  device structure any  more which means that  if more than 1 card in
 141    2.0.x is    installed (4  in   2.1.x),  the  user   will have   to  edit
 142    linux/drivers/net/Space.c  to make room for  them. Hence, module loading
 143    is  the preferred way to use   this driver, since  it  doesn't have this
 144    limitation.
 146    Where SROM media  detection is used and  full duplex is specified in the
 147    SROM,  the feature is  ignored unless  lp->params.fdx  is set at compile
 148    time  OR during  a   module load  (insmod  de4x5   args='eth??:fdx' [see
 149    below]).  This is because there  is no way  to automatically detect full
 150    duplex   links  except through   autonegotiation.    When I  include the
 151    autonegotiation feature in  the SROM autoconf  code, this detection will
 152    occur automatically for that case.
 154    Command line  arguments are  now allowed, similar to  passing  arguments
 155    through LILO. This will allow a per adapter board set  up of full duplex
 156    and media. The only lexical constraints are:  the board name (dev->name)
 157    appears in  the list before its parameters.  The list of parameters ends
 158    either at the end of the parameter list or with another board name.  The
 159    following parameters are allowed:
 161            fdx        for full duplex
 162            autosense  to set the media/speed; with the following 
 163                       sub-parameters:
 164                       TP, TP_NW, BNC, AUI, BNC_AUI, 100Mb, 10Mb, AUTO
 166    Case sensitivity is important  for  the sub-parameters. They *must*   be
 167    upper case. Examples:
 169        insmod de4x5 args='eth1:fdx autosense=BNC eth0:autosense=100Mb'.
 171    For a compiled in driver, in linux/drivers/net/CONFIG, place e.g.
 172        DE4X5_OPTS = -DDE4X5_PARM='"eth0:fdx autosense=AUI eth2:autosense=TP"' 
 174    Yes,  I know full duplex  isn't permissible on BNC  or AUI; they're just
 175    examples. By default, full duplex is turned  off and AUTO is the default
 176    autosense setting. In  reality, I expect only the  full duplex option to
 177    be used. Note the use of single quotes in the two examples above and the
 178    lack of commas to separate items.
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