FreeBSD 7.0 manual page repository

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dcons - dumb console device driver



      dcons - dumb console device driver


      To compile this driver into the kernel, place the following lines in your
      kernel configuration file:
            options GDB
            device firewire
            device dcons
      Alternatively, to load the driver as a module at boot time, place the
      following line in your kernel configuration file:
            options GDB
      and in loader.conf(5):


      The dcons device is a simple console device which just reads from and
      writes to an allocated buffer for input and output respectively.  It is
      of no use by itself and it is supposed that the buffer is accessed via a
      bus like firewire(4) or kvm(3) for interaction.
      The buffer consists of 4 channels.  There are 2 ports, one for the con‐
      sole TTY and another is GDB port, then each port has an input channel and
      an output channel.




      If you want to run getty(8) on dcons, insert the following line into
      ttys(5) and send a HUP signal to init(8) using kill(1).
            dcons   "/usr/libexec/getty std.9600"   vt100   on  secure
      Once the fwohci(4) device is initialized to allow physical access, the
      buffer can be accessed from another host via a firewire(4) bus using the
      dconschat(8) application.  See dconschat(8) for more details.
      dcons_crom(4), ddb(4), firewire(4), fwohci(4), ttys(5), conscontrol(8),
      dconschat(8), fwcontrol(8)


      Hidetoshi Shimokawa 〈〉


      This driver is currently under development.


Based on BSD UNIX
FreeBSD is an advanced operating system for x86 compatible (including Pentium and Athlon), amd64 compatible (including Opteron, Athlon64, and EM64T), UltraSPARC, IA-64, PC-98 and ARM architectures. It is derived from BSD, the version of UNIX developed at the University of California, Berkeley. It is developed and maintained by a large team of individuals. Additional platforms are in various stages of development.