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1.1     ! rkujawa     1: # Using multipie wsdisplay devices
        !             2: 
        !             3: Using a machine with single graphics card is trivial and well documented.
        !             4: However, once second graphics card is installed, additional wsdisplay device
        !             5: is detected by the kernel. But how to use it? By default screen will be
        !             6: added only on device used as a console:
        !             7: 
        !             8:        $ dmesg | grep ^ws
        !             9:        wsdisplay1 at tdvfb0 kbdmux 1
        !            10:        wsmux1: connecting to wsdisplay1
        !            11:        wsdisplay0 at r128fb0 kbdmux 1: console (default, vt100 emulation)
        !            12:        wsmux1: connecting to wsdisplay0
        !            13:        wskbd0 at ukbd0: console keyboard, using wsdisplay0
        !            14:        wsmouse0 at ums0 mux 0
        !            15: 
        !            16: In the above example r128fb (wsdisplay0) is used as console.
        !            17: 
        !            18: All wsdisplay devices are accessed through <code>/dev/ttyE*</code> files.
        !            19: Standard installation has only files for a single wsdisplay!
        !            20: 
        !            21: First you need to determine which major number is used for wsdisplay:
        !            22: 
        !            23:        $ mknod -l wsdisplay
        !            24:        wsdisplay character major 35
        !            25: 
        !            26: Device minor numbers for single wsdisplay are 8-bit. So wsdisplay0 occupies
        !            27: range 0 to 254:
        !            28: 
        !            29:        $ ls -l /dev/ttyE*
        !            30:        crw-------  1 root  tty    35,   0 Oct  3 00:17 /dev/ttyE0
        !            31:        crw-------  1 root  wheel  35,   1 Jul 15  2012 /dev/ttyE1
        !            32:        crw-------  1 root  wheel  35,   2 Jul 15  2012 /dev/ttyE2
        !            33:        crw-------  1 root  wheel  35,   3 Jul 15  2012 /dev/ttyE3
        !            34:        crw-------  1 root  wheel  35,   4 Jul 15  2012 /dev/ttyE4
        !            35:        crw-------  1 root  wheel  35,   5 Jul 15  2012 /dev/ttyE5
        !            36:        crw-------  1 root  wheel  35,   6 Jul 15  2012 /dev/ttyE6
        !            37:        crw-------  1 root  wheel  35,   7 Jul 15  2012 /dev/ttyE7
        !            38:        crw-------  1 root  wheel  35, 255 Jul 15  2012 /dev/ttyEcfg
        !            39:        crw-------  1 root  wheel  35, 254 Jul 15  2012 /dev/ttyEstat
        !            40: 
        !            41: First screen on wsdisplay1 would have minor 256, second would have minor 257,
        !            42: while cfg device would have 511. So let's create the needed device files:
        !            43: 
        !            44:        # mknod /dev/ttyFcfg c 35 511
        !            45:        # mknod /dev/ttyF0 c 35 256
        !            46: 
        !            47: Now adding a new screen on wsdisplay1 is as easy as:
        !            48: 
        !            49:        # wsconscfg -f /dev/ttyFcfg 0 
        !            50: 
        !            51: Keep in mind that screens have separate numbers per wsdisplay device (so you
        !            52: will have two screens 0 now).
        !            53: 
        !            54:        # dmesg | tail -n1
        !            55:        wsdisplay1: screen 0 added (default)
        !            56: 
        !            57: Now that the screen is allocated, you can use it.
        !            58: 
        !            59: This information should go into man pages at some point, but currently I don't 
        !            60: know how to do it in a non-confusing way... Thanks to uwe@ for explaining how 
        !            61: ttyEcfg are used. 
        !            62: