mkinitramfs (8)
Name

mkinitramfs - generate an initramfs image

Synopsis

mkinitramfs [-d confdir] [-k] [-o outfile] [-r root] [version]

mkinitramfs [--supported-host-version= hversion]

mkinitramfs [--supported-target-version= tversion]

Description

The mkinitramfs script generates an initramfs image. The initramfs is a gzipped cpio archive. The archive can be used on a different box of the same arch with the corresponding Linux kernel. mkinitramfs is meant for advanced usage. On your local box update-initramfs should do all necessary steps.

At boot time, the kernel unpacks that archive into RAM disk, mounts and uses it as initial root file system. All finding of the root device happens in this early userspace.

Options

-d confdir
Set an alternate configuration directory.

-k
Keep the temporary directory used to make the image.

-o
outfile Write the image to outfile.

-r
root Override the ROOT setting in initramfs.conf.

version
Set the kernel version of the initramfs image (defaults to the running kernel).

--supported-host-version=hversion
This option queries if mkinitramfs can create ramdisks on a running kernel of version hversion.

--supported-target-version=tversion
This option queries if mkinitramfs can create ramdisks for kernel version tversion.

Files

/etc/initramfs-tools/initramfs.conf
The default configuration file for the script. See initramfs.conf(5) for a description of the available configuration parameter.

/etc/initramfs-tools/modules
Specified modules will be put in the generated image and loaded when the system boots. The format - one per line - is identical to that of /etc/modules, which is described in modules(5) .

/etc/initramfs-tools/conf.d
The conf.d directory allows to hardcode bootargs at initramfs build time via config snippets. This allows to set ROOT or RESUME. This is especially useful for bootloaders, which do not pass an root bootarg.

/etc/initramfs-tools/DSDT.aml
If this file exists, it will be appended to the initramfs in a way that causes it to be loaded by ACPI.

Author

The initramfs-tools are written by Maximilian Attems <maks@sternwelten.at>, Jeff Bailey <jbailey@raspberryginger.com> and numerous others.

See Also

initramfs.conf(5) , initramfs-tools(8) , update-initramfs(8) .

$Date: 2007/01/02 $
MKINITRAMFS(8)

initramfs.conf (5)
Name

initramfs.conf - configuration file for mkinitramfs

Description

The behaviour of mkinitramfs can be modified by its configuration file.

Each line in the file can be a configuration variable, a blank line, or a comment. The value of an variable is assigned by an statement of the form: name=[value]

Configuration options can be broken out into configuration snippets and placed in individual files in the /etc/mkinitramfs/conf.d directory. Files in this directory are always read after the main configuration file, so you can override the settings in the main config file without editing it directly.

General Variables

MODULES
Specifies the modules for the initramfs image. The default setting is most.

most adds all the framebuffer, acpi, file system, ide, sata, scsi and usb drivers.

dep tries to guess which modules are necessary for the running box.

netboot adds the base modules, network modules, but skips block devices.

list includes only modules from the additional modules list.

BUSYBOX
Include busybox utilities for the boot scripts. If set to ‘n’ mkinitramfs will build an initramfs without busybox. Beware that many boot scripts need busybox utilities.

NFS Variables

BOOT Allows to use an nfs drive as the root of the drive. The default is to boot from local media (harddrive, USB stick). Set to nfs for an NFS root share.

DEVICE
Specifies the network interface, like eth0.

NFSROOT
Defaults to auto in order to pick up value from DHCP server. Otherwise you need to specify HOST:MOUNT.

Author

The initramfs-tools are written by Maximilian Attems <maks@sternwelten.at>, Jeff Bailey <jbailey@raspberryginger.com> and numerous others. Loosely based on mkinitrd.conf by Herbert Xu.

See Also

initramfs-tools(8) , mkinitramfs(8) , update-initramfs(8) .

$Date: 2007/01/01 $
INITRAMFS.CONF(5)

Настраивается пакет linux-image-2.6.24-17-generic (2.6.24-17.31) ...
Running depmod.
update-initramfs: Generating /boot/initrd.img-2.6.24-17-generic

depmod(8) depmod(8)

NAME
depmod — program to generate modules.dep and map files.

SYNOPSIS
depmod [-b basedir] [-e] [-F System.map] [-n] [-v] [version] [-A]

depmod [-e] [-FSystem.map] [-n] [-v] [version] [filename ...]

DESCRIPTION
Linux kernel modules can provide services (called "symbols") for other modules to use (using EXPORT_SYMBOL in the code). If a second module uses this symbol, that
second module clearly depends on the first module. These dependencies can get quite complex.

depmod creates a list of module dependencies, by reading each module under /lib/modules/version and determining what symbols it exports, and what symbols it needs. By
default this list is written to modules.dep in the same directory. If filenames are given on the command line, only those modules are examined (which is rarely use‐
ful, unless all modules are listed).

If a version is provided, then that kernel version’s module directory is used, rather than the current kernel version (as returned by "uname -r").

depmod will also generate various map files in this directory, for use by the hotplug infrastructure.

OPTIONS
-a --all Probe all modules. This option is enabled by default if no file names are given in the command-line.

-A --quick
This option scans to see if any modules are newer than the modules.dep file before any work is done: if not, it silently exits rather than regenerating the
files.

-b basedir --basedir basedir
If your modules are not currently in the (normal) directory /lib/modules/version, but in a staging area, you can specify a basedir which is prepended to the
directory name. This basedir is stripped from the resulting modules.dep file, so it is ready to be moved into the normal location.

-C --config file or directory
This option overrides the default configuration file (/etc/depmod.conf or /etc/depmod.d/ if that isn’t found).

-e --errsyms
When combined with the -F option, this reports any symbols which a module needs which are not supplied by other modules or the kernel. Normally, any symbols
not provided by modules are assumed to be provided by the kernel (which should be true in a perfect world).
-F --filesyms System.map
Supplied with the System.map produced when the kernel was built, this allows the -e option to report unresolved symbols.

-h --help Print the help message, and exit.

-n --dry-run
This sends the resulting modules.dep, then the various map files, to standard output, rather than writing them into the module directory.

-v --verbose
In verbose mode depmod will print (to stdout) all the symbols each module depends on and the module’s file name which provides that symbol.

-V --version
Show version of program, and exit. See below for caveats when run on older kernels.

BACKWARDS COMPATIBILITY
This version of depmod is for kernels 2.5.48 and above. If it detects a kernel with support for old-style modules, or the version specified is before 2.5.48, it will
attempt to run depmod.old in its place, so it is completely transparent to the user.

COPYRIGHT
This manual page Copyright 2002, Rusty Russell, IBM Corporation.

SEE ALSO
modprobe(8), modules.dep(5), depmod.old(8)

depmod(8)
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