dz(4) - NetBSD Manual Pages

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DZ(4)                   NetBSD Kernel Interfaces Manual                  DZ(4)


NAME

     dz -- eMIPS console serial device interface


SYNOPSIS

     dz* at ebus0 addr ?


DESCRIPTION

     This serial line provides a simple communication line with no modem con-
     trol.  It is not adequate for UNIX dialup use.

     Normal I/O control parameters for individual lines are managed by
     ioctl(2) calls.  Line speeds may be initiated via the ttys(5) file,
     stty(1) or ifconfig(8) to name a few, see tty(4).

     The dz driver monitors the rate of input on each board, and switches
     between the use of character-at-a-time interrupts and input silos.  While
     the silo is enabled during periods of high-speed input, the driver polls
     for input 30 times per second.


FILES

     /dev/ttyD0            phys interface.


DIAGNOSTICS

     dz%d: silo overflow .  The 1 character input silo overflowed before it
     could be serviced.  This can happen if a hard error occurs when the CPU
     is running with elevated priority, as the system will then print a mes-
     sage on the console with interrupts disabled.  It is not serious.


SEE ALSO

     stty(1), tty(4), ttys(5), getty(8)


HISTORY

     A dz driver appeared in NetBSD 6.0.

NetBSD 7.0                       July 17, 2010                      NetBSD 7.0