NAME

dz — eMIPS console serial device interface

SYNOPSIS

dz* at ebus0 addr ?

DESCRIPTION

This serial line provides a simple communication line with no modem control. 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 message 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.