lboot - configure bootable kernel
The lboot command is used to configure a bootable UNIX kernel. Master
files in the directory master contain configuration information used by
lboot when creating a kernel. System files in the directory system are
used by lboot to determine which modules are to be configured into the
If a module in master is specified in the system file via "INCLUDE:",
that module is included in the bootable kernel. For all included
modules, lboot searches the boot directory for an object file with the
same name as the file in master, but with a .o or .a appended. If found,
this object is included when building the bootable kernel.
For every module in the system file specified via "VECTOR:", lboot takes
actions to determine if a hardware device corresponding to the specified
module exists. Generally, the action is a memory read at a specified
base, of the specified size. If the read succeeds, the device is assumed
to exist, and its module is also included in the bootable kernel.
Master files that are specified in the system file via "EXCLUDE:" are
also examined; stubs are created for routines specified in the excluded
master files that are not found in the included objects.
Master files that are specified in the system file via "USE:" are treated
as though the file were specified via the "INCLUDE:" directive, if an
object file corresponding to the master file is found in the boot
directory. If no such object file is found, "USE:" is treated as
To create the new bootable object file, the applicable master files are
read and the configuration information is extracted and compiled. The
output of this compilation is then linked with all included object files.
Unless directed otherwise in the system file, the information is compiled
with $TOOLROOT/usr/bin/cc and combined with the modules in the boot
directory using $TOOLROOT/usr/bin/ld.
The options are:
-m master Specifies the directory containing the master files to be
used for the bootable kernel. The default master directory
-s system Specifies the directory containing the system files. The
default system directory is $ROOT/var/sysgen/system.
-b boot Specifies the directory where object files are to be found.
The default boot directory is $ROOT/var/sysgen/boot.
-n mtune Specifies the directory where tunable parameters are to be
found. The default mtune directory is
-c stune Specifies the name of the file defining customized tunable
parameter values. The default stune file is
-r ROOT ROOT becomes the starting pathname when finding files of
interest to lboot. Note that this option sets ROOT as the
search path for include files used to generate the target
kernel. If this option is not specified, the ROOT
environment variable (if any) is used instead.
-v Makes lboot slightly more verbose.
-u unix Specifies the name of the target kernel. By default, it is
unix.new, unless the -t option is used, in which case the
default is unix.install.
-d Displays debugging information about the devices and modules
put in the kernel.
-a Used to auto-register all dynamically loadable kernel modules
that contain a d and an R in their master files. Only the
auto-register is performed, a kernel is not configured.
-N Disables auto-registering of all dynamically loadable
modules. A kernel is produced, but no auto-registration is
-l Used to ignore the d in all master files and link all
necessary modules into the kernel.
-e Causes the result of whether an auto-config would have been
performed to be printed, but no actual configuration is
-w Used to specify a work directory into which the master.c and
edt.list files are written. By default these files are
written into the boot directory.
-t Tests if the existing kernel is up-to-date. If the kernel is
not up-to-date, it prompts you to proceed. It compares the
modification dates of the system files, the object files in
the boot directory, the modification time of the boot
directory, the configuration files in the master.d directory
and the modification time of the stune file with that of the
existing kernel. It also probes for the devices specified
with "VECTOR:" lines in the system file. If the devices have
been added or removed, or if the kernel is out-of-date, it
builds a new kernel, adding .install to the target name.
-T Performs the same function as the -t option, but does not
prompt you to proceed.
-O tags Specifies tags to be used to select which tunable parameters
to use as part of the the kernel build. Multiple -O options
may be given.
-L master Specifies the name of the dynamically loadable kernel module
to load into the running kernel. master is the name of a
master file in the $ROOT/var/sysgen/master.d directory.
-R master Specifies the name of the dynamically loadable kernel module
to register. master is the name of a master file in the
-U id Used to unload a dynamically loadable kernel module. id is
found by using the lboot -V command.
-W id Used to unregister a dynamically loadable kernel module. id
is found by using the lboot -V command.
-V Used to list all of the currently registered and loaded
dynamically loadable kernel modules.
It is best to reconfigure the kernel on a system with the autoconfig
lboot -s newsystem
Reads the file named newsystem to determine which objects should be
configured into the bootable object.
autoconfig(1M), setsym(1M), systune(1M), master(4), mload(4), mtune(4),
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