slackware-current/README.initrd
Patrick J Volkerding 8c9271e25c Thu May 31 04:55:33 UTC 2018
a/kernel-generic-4.14.47-x86_64-1.txz:  Upgraded.
a/kernel-huge-4.14.47-x86_64-1.txz:  Upgraded.
  SCSI_DPT_I2O m -> y
  SCSI_ISCI m -> y (thanks to wael_h)
a/kernel-modules-4.14.47-x86_64-1.txz:  Upgraded.
a/pkgtools-15.0-noarch-14.txz:  Rebuilt.
  installpkg: rarely, an uncompressed size that's not quite to the next level
  (e.g., 1020K) will exceed the expected length and cause a --terse line to
  be one character longer than --terselength. Chop lines to --terselength
  before outputting them. The trailing ']' might be dropped, but no big deal.
ap/slackpkg-2.83.0-noarch-1.txz:  Upgraded.
  Release 2.83.0; thanks to orbea, Didier Spaier, burdi01, David Allen,
  Eduard Rozenberg, and Stuart Winter for various fixes and enhancements.
  Allow using vimdiff to compare .new and original files
  Numerous fixups for alternate $ROOT
  .new config files are sorted so that display order should be consistent
  among multiple machines
  Abort operation if system date is near epoch (mostly relevant for ARM
  machines and others with no RTC)
  Update Slackware ARM gpg key
  Update Slackware ARM mirror list
  No longer offer to run lilo - simply advise user that the kernel image has
  changed and give advice, but also require a keypress to (hopefully) confirm
  that the message was actually read
  mandoc lint fixes to slackpkg.8
  Warn user if a -current mirror is selected (but only warn once)
d/git-2.17.1-x86_64-1.txz:  Upgraded.
d/kernel-headers-4.14.47-x86-1.txz:  Upgraded.
d/rust-1.26.1-x86_64-1.txz:  Upgraded.
k/kernel-source-4.14.47-noarch-1.txz:  Upgraded.
l/fftw-3.3.8-x86_64-1.txz:  Upgraded.
l/imagemagick-6.9.9_48-x86_64-1.txz:  Upgraded.
n/network-scripts-15.0-noarch-8.txz:  Rebuilt.
  Allow setting an interface in promiscuous mode; this is needed for networking
  to function properly in containers
  Fixup setting of IPALIASES (allow non /32 masks; not only is the /32 mask not
  required and even undesirable in some cases, this makes ipv6 support easier
  to integrate (and Darren is working on that as well)
  Thanks to Darren Austin.
n/stunnel-5.46-x86_64-1.txz:  Upgraded.
n/ulogd-2.0.7-x86_64-2.txz:  Rebuilt.
  Fixed empty logrotate file.
x/xorg-server-1.20.0-x86_64-2.txz:  Rebuilt.
  Patched to fix nouveau segfault. Thanks to Rod3775 for the patch.
x/xorg-server-xephyr-1.20.0-x86_64-2.txz:  Rebuilt.
x/xorg-server-xnest-1.20.0-x86_64-2.txz:  Rebuilt.
x/xorg-server-xvfb-1.20.0-x86_64-2.txz:  Rebuilt.
xap/network-manager-applet-1.8.12-x86_64-2.txz:  Rebuilt.
  Patched crash bug. Thanks to gmgf.
isolinux/initrd.img:  Rebuilt.
kernels/*:  Upgraded.
usb-and-pxe-installers/usbboot.img:  Rebuilt.
2018-05-31 23:57:37 +02:00

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Slackware initrd mini HOWTO
by Patrick Volkerding, volkerdi@slackware.com
Thu May 31 03:30:41 UTC 2018
This document describes how to create and install an initrd, which may be
required to use the 4.x kernel. Also see "man mkinitrd".
1. What is an initrd?
2. Why to I need an initrd?
3. How do I build the initrd?
4. Now that I've built an initrd, how do I use it?
1. What is an initrd?
Initrd stands for "initial ramdisk". An initial ramdisk is a very small
Linux filesystem that is loaded into RAM and mounted as the kernel boots,
and before the main root filesystem is mounted.
2. Why do I need an initrd?
The usual reason to use an initrd is because you need to load kernel
modules before mounting the root partition. Usually these modules are
required to support the filesystem used by the root partition (ext3, ext4,
btrfs, xfs), or perhaps the controller that the hard drive is attached
to (SCSI, RAID, etc). Essentially, there are so many different options
available in modern Linux kernels that it isn't practical to try to ship
many different kernels to try to cover everyone's needs. It's a lot more
flexible to ship a generic kernel and a set of kernel modules for it.
3. How do I build the initrd?
The easiest way to make the initrd is to use the mkinitrd script included
in Slackware's mkinitrd package. We'll walk through the process of
upgrading to the generic 4.14.47 Linux kernel using the packages
found in Slackware's slackware/a/ directory.
First, make sure the kernel, kernel modules, and mkinitrd package are
installed (the current version numbers might be a little different, so
this is just an example):
installpkg kernel-generic-4.14.47-x86_64-1.txz
installpkg kernel-modules-4.14.47-x86_64-1.txz
installpkg mkinitrd-1.4.11-x86_64-6.txz
Change into the /boot directory:
cd /boot
Now you'll want to run "mkinitrd". I'm using ext4 for my root filesystem,
and since the disk controller requires no special support the ext4 module
will be the only one I need to load:
mkinitrd -c -k 4.14.47 -m ext4
This should do two things. First, it will create a directory
/boot/initrd-tree containing the initrd's filesystem. Then it will
create an initrd (/boot/initrd.gz) from this tree. If you wanted to,
you could make some additional changes in /boot/initrd-tree/ and
then run mkinitrd again without options to rebuild the image. That's
optional, though, and only advanced users will need to think about that.
Here's another example: Build an initrd image using Linux 4.14.47
kernel modules for a system with an ext4 root partition on /dev/sdb3:
mkinitrd -c -k 4.14.47 -m ext4 -f ext4 -r /dev/sdb3
4. Now that I've built an initrd, how do I use it?
Now that you've got an initrd (/boot/initrd.gz), you'll want to load
it along with the kernel at boot time. If you use LILO for your boot
loader you'll need to edit /etc/lilo.conf and add a line to load the
initrd. Here's an example section of lilo.conf showing how this is
done:
# Linux bootable partition config begins
image = /boot/vmlinuz-generic
initrd = /boot/initrd.gz
root = /dev/sda6
label = Slackware
read-only
# Linux bootable partition config ends
The initrd is loaded by the "initrd = /boot/initrd.gz" line.
Just add the line right below the line for the kernel image you use.
Save the file, and then run LILO again ('lilo' at the command line).
You'll need to run lilo every time you edit lilo.conf or rebuild the
initrd.
Other bootloaders such as syslinux also support the use of an initrd.
See the documentation for those programs for details on using an
initrd with them.
---------
Have fun!