IABSD.fr/xenocara/driver/xf86-video-cirrus/README.multihead

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• Author : matthieu
  Date : 2006-11-26 20:01:58
  Hash : 113f7dfd
  Message : Importing xf86-video-cirrus 1.1.0

• driver/xf86-video-cirrus/README.multihead

• WARNING:
  On exit XFree86 restores the old mode but it
  does not disable the secondary card. As a result
  the second card (which has some randonm CRTC timing)
  may produce synch pulses which are wrong for your
  monitor.
  
  If your monitor does not tolerate bad timing I would
  recommend that you don't try Multi-head yet, or at
  least, turn it off *before* leaving X.
  
  
  3.9Nl notice: There is a problem with releasing
  of LBX colormap privates which may cause a seg.
  fault when the server exits. I got a patch from
  Mark Vojkovich which fixes it.
  
  If you have a CL-GD5480 or CL-GD5446 ver. B you
  should be able to try Multi-Head with that
  card as a secondary. The primary card should not
  have any special feature. Some MainBoards may
  not do it right too. I tried it with a 5465 (AGP)
  as a primary and 5446B (PCI) secondary on an
  ABIT LX6 upgraded to the latest bios.
  
  Version A of the 5446 cannot be pure MMIO (The driver 
  requires that it is the primary display adapter).
  You can distinguish between the rel A and rel B by
  running "scanpci -v". Version 1 does not report a
  valid BASE1 address.
  
  The bios upgrade lets me chose if the primary
  display adapter is on PCI on AGP (I chose
  the AGP card as primary). Warning - this setup
  will *NOT* work with XFree86 3.3.2.
  
  The only problem that I found so far is with
  memory configuration initialization. My bios
  does not initialize the secondary display adapter.
  This results in a currupted display.
  
  Here are the options:
  1. warm booting from Windows 98 may work. I have
  not tried that.
  
  2. Take out the other card and leave the 5446
  (or 5480) as the primary card. Start the server
  and watch it's output. Look for lines like:
    (--) CIRRUS(0): Memory Config reg 1 is 0x1B
    (--) CIRRUS(0): Memory Config reg 2 is 0x21
  Remember these values. Now edit XF86Config
  and add to the proper device section the lines:
    Option "MemCFG1" "0x1B"
    Option "MemCFG2" "0x21"
  These values are the contents of registers SR0F
  and SR17. (notice: the 5480 driver does not use
  and will not print MemCFG2).
  
  Now you can reinstall the other card (which
  must me set as the the primary display adaptor).
  
  A note about configuring multi-head:
  There should be a separate section for each
  adapter (device), Monitor and Screen. A "ServerLayout"
  section is optional (and recommended). To make it
  easier for XFree86 to relate device sections to
  actual cards, use a BusId line in each device
  section. XFree86 3.9N works properly if the config
  file is for Multi-head but it finds only one
  display adapter.