12-31-2008
I see you're trying to use a device mapper. Could you provide the initramfs scripts in /etc directory that create the device mapper rootfs? I use device mapper with cryptsetup/luks to encrypt my rootfs. The problem is probably that you don't have the appropriate scripts to create /dev/mapper/rootfs before init calls pivot_root.
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LEARN ABOUT LINUX
update-initramfs
UPDATE-INITRAMFS(8) update-initramfs manual UPDATE-INITRAMFS(8)
NAME
update-initramfs - generate an initramfs image
SYNOPSIS
update-initramfs -c|-d|-u [-k version] [-t] [-v] [-b] [-h]
DESCRIPTION
The update-initramfs script manages your initramfs images on your local box. It keeps track of the existing initramfs archives in /boot.
There are three modes of operation create, update or delete. You must at least specify one of those modes.
The initramfs is a gzipped cpio archive. 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
-k version
Set the specific kernel version for whom the initramfs will be generated. For example the output of uname -r for your currently
running kernel. This argument is optional for update. The default is the latest kernel version.
The use of "all" for the version string specifies update-initramfs to execute the chosen action for all kernel versions, that are
already known to update-initramfs.
-c This mode creates a new initramfs.
-u This mode updates an existing initramfs.
-d This mode removes an existing initramfs.
-t Allows one to take over an custom initramfs with a newer one.
-v This option increases the amount of information you are given during the chosen action.
-b Set an different bootdir for the image creation.
-h Print a short help page describing the available options in update-initramfs.
EXAMPLES
Update the initramfs of the newest kernel:
update-initramfs -u
Create the initramfs for a specific kernel:
update-initramfs -c -k 2.6.18-1-686
FILES
/etc/initramfs-tools/update-initramfs.conf
AUTHOR
The initramfs-tools are written by Maximilian Attems <maks@debian.org>, Jeff Bailey <jbailey@raspberryginger.com> and numerous others.
SEE ALSO
initramfs.conf(5), initramfs-tools(8), mkinitramfs(8).
Linux 2008/12/19 UPDATE-INITRAMFS(8)