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wiz 2003-05-14 12:19:15 +00:00
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68
share/man/man8/man8.i386/boot_console.8
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@ -1,4 +1,4 @@
.\" $NetBSD: boot_console.8,v 1.9 2003/03/20 17:27:05 drochner Exp $
.\" $NetBSD: boot_console.8,v 1.10 2003/05/14 12:19:15 wiz Exp $
.\"
.\" Copyright (c) 1997
.\" Matthias Drochner. All rights reserved.
@ -37,7 +37,8 @@ The
i386 bootloader selects a console device for its user interaction and
passes information about it to the
.Nx
kernel. The selection process is controlled by bootloader compile-time
kernel.
The selection process is controlled by bootloader compile-time
options and system setup at the bootloader startup time, and may
be changed on-the-fly from within the bootloader.
.\"
@ -47,24 +48,27 @@ The compile-time options (to be set in the booter's
are:
.Bl -ohang
.It Dv Sy SUPPORT_SERIAL= Ns Fa policy
enables support for serial input / output. By default this option is
enables support for serial input/output.
By default this option is
not set and the standard PC keyboard and display are always used as the
console device. See
.Dq Em "Console selection Policy"
console device.
See
.Sx Console Selection Policy
below for valid values of
.Fa policy .
.It Dv Sy DIRECT_SERIAL
causes direct hardware access to be used for serial input / output.
With this option, software handshake (XON/XOFF) is used for flow
control. Without this option, BIOS functions are employed for serial
control.
Without this option, BIOS functions are employed for serial
port handling, which require hardware handshake lines to be completely
wired.
.It Dv Sy CONSPEED= Ns Fa integer
sets the baud-rate for the serial console. This option has only an
effect when used in combination with the
sets the baud-rate for the serial console.
This option has only an effect when used in combination with the
.Dq Dv DIRECT_SERIAL
option above, otherwise, the default setting of 9600 baud is used. The
value of
option above, otherwise, the default setting of 9600 baud is used.
The value of
.Fa integer
must be something that makes sense as a serial port baud rate.
.It Dv Sy COMCONS_KEYPRESS
@ -82,8 +86,8 @@ The following options are available:
Force use of the standard PC keyboard and display as the console.
.It Dv Em CONSDEV_COM0 Li ... Dv Em CONSDEV_COM3
Use the serial port with the corresponding BIOS number as the console.
No output is attempted to the selected serial port. If the port is not
known to the BIOS, it falls back to
No output is attempted to the selected serial port.
If the port is not known to the BIOS, it falls back to
.Dq Dv CONSDEV_PC .
(Note: This feature can be deliberately used for console selection if
the serial ports have been disabled in the BIOS.)
@ -94,20 +98,22 @@ succeeds (and if
is defined the RS-232
.Dq "modem ready"
status is on after the character is output), the port is used as
console. If the port is not known to the BIOS, it falls back to
console.
If the port is not known to the BIOS, it falls back to
.Dq Dv CONSDEV_PC .
.It Dv Em CONSDEV_AUTO
Auto-select the console. All serial ports known to the BIOS are probed
in sequence. If output of a character to the port succeeds (and if
Auto-select the console.
All serial ports known to the BIOS are probed in sequence.
If output of a character to the port succeeds (and if
.Dq Dv DIRECT_SERIAL
is defined the RS-232
.Dq "modem ready"
status is on after the character is output), the port is used as console.
If no serial port passes the check,
.Dq Dv CONSDEV_PC
is used. The progress of the selection process is shown at the PC
display as digits corresponding to the serial port number currently
probed.
is used.
The progress of the selection process is shown at the PC display as
digits corresponding to the serial port number currently probed.
.El
.\"
.Sh FILES
@ -123,23 +129,25 @@ compile time options for the boot programs.
.Sh BUGS
The value of
.Dv SERIAL_POLICY
should be settable through a boot configuration option. However
traditionally there was no non-volatile storage available on the PC
platform. This requires console auto-selection methods which can be
inconvenient and / or unstable in some situations. The selection policy
should be adapted to the local hardware configuration, which might
require code changes. (Some BIOS versions, particularly those used on
should be settable through a boot configuration option.
However traditionally there was no non-volatile storage available on the
PC platform.
This requires console auto-selection methods which can be
inconvenient and/or unstable in some situations.
The selection policy should be adapted to the local hardware configuration,
which might require code changes.
(Some BIOS versions, particularly those used on
large servers and in embedded and single-board industrial computers,
have integrated support for serial consoles. The boot loader should
query for these settings if possible.)
have integrated support for serial consoles.
The boot loader should query for these settings if possible.)
.Pp
The serial communication parameters (byte-size, parity, stop-bits) are
not settable (either at compile time or run time). The default
parameters are
not settable (either at compile time or run time).
The default parameters are
.Dq "8 N 1" .
.Pp
The baud rate is not settable when using BIOS I/O. It should be
settable at compile time with
The baud rate is not settable when using BIOS I/O.
It should be settable at compile time with
.Dv Dq CONSPEED
just as it is when using
.Dv Dq DIRECT_SERIAL .