MHZC(4) BSD Kernel Interfaces Manual MHZC(4)NAME
mhzc -- Megahertz Ethernet/modem card driver
mhzc* at pcmcia? function ?
com* at mhzc?
sm* at mhzc?
The mhzc device driver provides support for the Megahertz combined Ethernet and modem cards.
SEE ALSO com(4), pcmcia(4), sm(4)HISTORY
The mhzc driver appeared in NetBSD 1.5.
BSD February 18, 2007 BSD
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COM(4) BSD Kernel Interfaces Manual COM(4)NAME
com -- serial communications interface for RS-232C
com0 at isa? port "IO_COM1" irq 4
com1 at isa? port "IO_COM2" irq 3
com* at acpi?
com* at cardbus?
com* at isapnp?
com* at mca? slot ?
com* at mhzc?
com* at ofisa?
com* at pcmcia?
com* at pcmcom?
com* at pnpbios? index ?
com* at puc? port ?
com* at xirc?
com0 at mainbus? base 0x00210fe0
com1 at mainbus? base 0x00210be0
HP 9000/300 and 400 Series
com* at dio? scode ?
com* at frodo? offset ?
HP 9000/700 and 800 Series
com* at dino?
com* at gsc?
com* at ssio?
IBM PowerPC 4xx
com* at opb?
com* at ebus?
com* at obio0
The com driver provides support for NS8250-, NS16450-, and NS16550-based EIA RS-232C (CCITT V.28) communications interfaces. The NS8250 and
NS16450 have single character buffers, and the NS16550 has a 16 character buffer.
Input and output for each line may set to one of following baud rates; 50, 75, 110, 134.5, 150, 300, 600, 1200, 1800, 2400, 4800, 9600,
19200, 38400, 57600, or 115200, or any other baud rate which is a factor of 115200.
The ttyXX devices are traditional dial-in devices; the dtyXX devices are used for dial-out. (See tty(4).)
options COM_HAYESP adds support for the Hayes ESP serial board.
options PPS_SYNC enables code to use the Data Carrier Detect (DCD) signal line for attachment to an external precision clock source (e.g.,
GPS, CDMA) which generates a Pulse Per Second (PPS) signal. This is used by ntpd(8) to discipline the system clock, and more accurately
count/measure time. See options(4) for more discussion.
With options RND_COM enabled, the com driver can be used to collect entropy for the rnd(4) entropy pool. The entropy is generated from
If ``flags 1'' is specified, the com driver will not set the MCR_IENABLE bit on the UART. This is mainly for use on AST multiport boards,
where the MCR_IENABLE bit is used to control whether or not the devices use a shared interrupt.
com%d: %d silo overflows The input ``silo'' has overflowed and incoming data has been lost.
com%d: weird interrupt: iir=%x The device has generated an unexpected interrupt with the code listed.
SEE ALSO acpi(4), ast(4), cardbus(4), isa(4), isapnp(4), mca(4), mhzc(4), ofisa(4), options(4), pcmcia(4), pcmcom(4), pnpbios(4), puc(4), rtfps(4),
tty(4), xirc(4), ntpd(8)HISTORY
The com driver was originally derived from the HP9000/300 dca driver.
Data loss is possible on busy systems with unbuffered UARTs at high speed.
The name of this driver and the constants which define the locations of the various serial ports are holdovers from DOS.
BSD June 7, 2011 BSD
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