Initrd for Raid-Boot - Revision history

Lsuser1985: no longer "work in progress"

Lsuser1985 — Tue, 10 May 2011 18:55:26 GMT

no longer "work in progress"

← Older revision		Revision as of 18:55, 10 May 2011
Line 2:		Line 2:

	'''Note:''' An ''initrd'' is only required of you have to set up some things to make the system boot, like starting the RAID, loading special modules or starting dm-crypt. If you do not have any of these needs, there is simply no need for an ''initrd'', since the kernel will happily boot from hard disk.		'''Note:''' An ''initrd'' is only required of you have to set up some things to make the system boot, like starting the RAID, loading special modules or starting dm-crypt. If you do not have any of these needs, there is simply no need for an ''initrd'', since the kernel will happily boot from hard disk.
-
-	<span style="color: red">'''This page is work in progress'''.</span> While all relevant information is already present, the description is not yet complete. Please have a look here again in a few days.

	== Credits ==		== Credits ==

Lsuser1985: /* File make-initrd.txt */

Lsuser1985 — Tue, 10 May 2011 13:37:33 GMT

File make-initrd.txt

← Older revision		Revision as of 13:37, 10 May 2011
Line 138:		Line 138:
	umount INITRD		umount INITRD
	gzip initrd		gzip initrd
-	mkimage -A arm -O linux -T ramdisk -C gzip -a 0x0 -e 0x0 -n initrd -d initrd.gz initrd.buffalo	+	mkimage -A arm -O linux -T ramdisk -C gzip -a 0x0 -e 0x0 -n initrd -d initrd.gz ../initrd.buffalo

Lsuser1985 at 13:34, 10 May 2011

Lsuser1985 — Tue, 10 May 2011 13:34:59 GMT

← Older revision		Revision as of 13:34, 10 May 2011
Line 31:		Line 31:
	# Run the script on your LS		# Run the script on your LS

-	'''Note:''' This Guide will install additional software into your debootstraped environment. Thus you may really want to create ''hddrootfs.buffalo.updated'' (as ~~descriped~~ in [[Debian_Squeeze_on_'V'_and_'X'_Series#Personalize the deboostrap]]) prior to building the ''initrd''.	+	'''Note:''' This Guide will install additional software into your debootstraped environment. Thus you may really want to create ''hddrootfs.buffalo.updated'' (as described in [[Debian_Squeeze_on_'V'_and_'X'_Series#Personalize the deboostrap]]) prior to building the ''initrd''.
		+
		+	== Detailed description ==
		+
		+	# Create a text-file/script ''linuxrc.txt'' with the content shown below
		+	# Uncomment the line ''echo "0x..." > ...'' which matched the device to be used as root
		+	# Create a text-file/script ''make-initrd.txt'' with the content shown below
		+	# Change the ''DEBOOTSTRAP=...'' line at the top to match your debootstraped environment.
		+	# Copy both files to your LS.
		+	# Now log into your LS and continue there.
		+	# Find the place on your LS where you copied the files to:
		+	#: If you used the share "share", this should be either ''/mnt/disk1/share'' or ''/mnt/array1/share''
		+	#: If you used scp, winscp or so, you'll know where :-)
		+	# Run the script on your LS. Assuming you copied the file to ''/mnt/disk1/share'', the command will be
		+	sh /mnt/disk1/share/make-initrd.txt
		+	# The initrd file will be ''initrd.buffalo'' in your debootstraped environment.
		+

	=== Required linuxrc.txt ===		=== Required linuxrc.txt ===
Line 38:		Line 54:

	#!/bin/busybox sh		#!/bin/busybox sh
-	# linuxrc - to be put into the ~~inted~~	+	# linuxrc - to be put into the initrd

	# Mount the /proc and /sys filesystems.		# Mount the /proc and /sys filesystems.
Line 60:		Line 76:
	umount /proc		umount /proc
	umount /sys		umount /sys
		+

	=== File make-initrd.txt ===		=== File make-initrd.txt ===
Line 65:		Line 82:
	Put this into a textfile called ''make-initrd.txt''.		Put this into a textfile called ''make-initrd.txt''.

-	~~chroot~~ debian-squeeze	+	#!/bin/bash
-	# install	+	# Licensed under GPL v3 or later
-	apt-get install --no-install-recommends busybox uboot-mkimage makedev	+	# make-initrd.txt -- This script will be executed on the LS
		+
		+	# edit this line as needed
		+	DEBOOTSTRAP=/root/debian-squeeze
		+
		+	if [ "$1" != chrooted ] ; then
		+	if [ ! -d $DEBOOTSTRAP ] ; then
		+	echo "debootstrap directory not found, please edit DEBOOTSTRAP in $0"
		+	exit 1
		+	fi
		+
		+	DIR=$( cd $(dirname $0) ; pwd)
		+
		+	cp "$0" "$DIR/linuxrc.txt" $DEBOOTSTRAP
		+	scriptname=$( basename "$0" )
		+	# rerun script in chrooted environment
		+	chroot $DEBOOTSTRAP bash -x "$scriptname" chrooted
		+	exit $?
		+	fi
		+
		+	# install some required stuff
		+	apt-get install --no-install-recommends busybox uboot-mkimage makedev dos2unix

	cd /tmp		cd /tmp
-	rm initrd.gz	+	[ -f initrd.gz ] && rm initrd.gz

	dd if=/dev/zero of=initrd bs=1k count=0 seek=3K		dd if=/dev/zero of=initrd bs=1k count=0 seek=3K
Line 87:		Line 125:
	cp -aL /bin/busybox INITRD/bin/		cp -aL /bin/busybox INITRD/bin/
	cp -aL /sbin/mdadm /sbin/pivot_root INITRD/sbin		cp -aL /sbin/mdadm /sbin/pivot_root INITRD/sbin
-		+
	# find required libs and install into INITRD/lib		# find required libs and install into INITRD/lib
	libs2install=$( ldd INITRD/bin/ \| grep -v "^INITRD/" \| sed -e 's/.=> //' -e 's/ (.//' \| sort -u )		libs2install=$( ldd INITRD/bin/ \| grep -v "^INITRD/" \| sed -e 's/.=> //' -e 's/ (.//' \| sort -u )
	cp -aL $libs2install INITRD/lib		cp -aL $libs2install INITRD/lib
-		+
	ln -s INITRD/bin/busybox INITRD/bin/sh		ln -s INITRD/bin/busybox INITRD/bin/sh

-	cp ../~~linuxrx~~.txt INITRD/linuxrc	+	cp ../linuxrc.txt INITRD/linuxrc
		+	dos2unix INITRD/linuxrc
	chmod +x INITRD/linuxrc		chmod +x INITRD/linuxrc

Lsuser1985: intermediate save

Lsuser1985 — Tue, 10 May 2011 12:03:38 GMT

intermediate save

← Older revision		Revision as of 12:03, 10 May 2011
Line 1:		Line 1:
	If you are going to have Debian and a RAID on your Linkstation, you'll need a initrd for setting up the root filesystem.		If you are going to have Debian and a RAID on your Linkstation, you'll need a initrd for setting up the root filesystem.
		+
		+	'''Note:''' An ''initrd'' is only required of you have to set up some things to make the system boot, like starting the RAID, loading special modules or starting dm-crypt. If you do not have any of these needs, there is simply no need for an ''initrd'', since the kernel will happily boot from hard disk.

	<span style="color: red">'''This page is work in progress'''.</span> While all relevant information is already present, the description is not yet complete. Please have a look here again in a few days.		<span style="color: red">'''This page is work in progress'''.</span> While all relevant information is already present, the description is not yet complete. Please have a look here again in a few days.
		+
		+	== Credits ==
		+
		+	Some ideas are taken from [[Debian Lenny on LS-WXL#Create an initrd]].
		+
		+	== What you need beforehand ==
		+
		+	This guide assumes you already [[Open Stock Firmware LS-VL\|opened your box]] and bootstrapped Debian as described in [[Debian Squeeze on 'V' and 'X' Series#Debootstrap]]. You may easily adapt this guide to other directory names or Debian versions. Or you may build the ''initrd'' on another device.
		+
		+	== The Guide ==

	Basic steps are:		Basic steps are:
	# Create an empty file and mount it as a filesystem to be able to copy data into		# Create an empty file and mount it as a filesystem to be able to copy data into
	# Into this mounted filesystem		# Into this mounted filesystem
-	## copy ~~the~~ ''linuxrc'' script	+	## copy a prepared ''linuxrc'' script
	## copy all binaries required by ''linuxrc'' plus the libraries required by the binaries		## copy all binaries required by ''linuxrc'' plus the libraries required by the binaries
	## create all required directories and device nodes required		## create all required directories and device nodes required
Line 13:		Line 25:

	For that you will		For that you will
-	# Create a text-file/script ''linuxrc.txt''	+	# Create and edit a text-file/script ''linuxrc.txt''
	# Create a text-file/script ''make-initrd.txt''		# Create a text-file/script ''make-initrd.txt''
	# Copy both files to your LS		# Copy both files to your LS
Line 19:		Line 31:
	# Run the script on your LS		# Run the script on your LS

-	~~Requirements~~:	+	'''Note:''' This Guide will install additional software into your debootstraped environment. Thus you may really want to create ''hddrootfs.buffalo.updated'' (as descriped in [[Debian_Squeeze_on_'V'_and_'X'_Series#Personalize the deboostrap]]) prior to building the ''initrd''.
-	* Opened Linkstation	+
-	* chroted Debian installation (~~debbotstrap on~~ the ~~linkstation~~)	+
-		+

	=== Required linuxrc.txt ===		=== Required linuxrc.txt ===

-	Put this into a ~~textfile~~ called ''linuxrc.txt'':	+	Put this into a text-file called ''linuxrc.txt''. You'll need to uncomment the line matching you root device.

	#!/bin/busybox sh		#!/bin/busybox sh
Line 54:		Line 63:
	=== File make-initrd.txt ===		=== File make-initrd.txt ===

-	Put this into a textfile called ''make-initrd.txt'':	+	Put this into a textfile called ''make-initrd.txt''.

-	# chroot debian-squeeze	+	chroot debian-squeeze
		+	# install
	apt-get install --no-install-recommends busybox uboot-mkimage makedev		apt-get install --no-install-recommends busybox uboot-mkimage makedev

Line 70:		Line 80:
	mkdir -p INITRD/{bin,lib,dev,etc/mdadm,proc,sbin}		mkdir -p INITRD/{bin,lib,dev,etc/mdadm,proc,sbin}
	cp -a /dev/{null,console,tty,sd{a,b,c,d}?,md*} INITRD/dev/		cp -a /dev/{null,console,tty,sd{a,b,c,d}?,md*} INITRD/dev/
-	# ensure sd? and md exits, even if chrooted installation ~~doe~~ not have them	+	# ensure sd? and md exits, even if chrooted installation does not have them
	cd INITRD/dev/		cd INITRD/dev/
	MAKEDEV sda sdb sdc sdd md		MAKEDEV sda sdb sdc sdd md
Line 77:		Line 87:
	cp -aL /bin/busybox INITRD/bin/		cp -aL /bin/busybox INITRD/bin/
	cp -aL /sbin/mdadm /sbin/pivot_root INITRD/sbin		cp -aL /sbin/mdadm /sbin/pivot_root INITRD/sbin
-	# ~~todo:~~ find required libs ~~automatically~~	+
-	cp -aL /~~lib~~/~~{libm~~.~~so.6,libc.so.6,libgcc_s.so.1,ld~~-~~linux~~.~~so.3}~~ INITRD/lib	+	# find required libs and install into INITRD/lib
-		+	libs2install=$( ldd INITRD/bin/ \| grep -v "^INITRD/" \| sed -e 's/.=> //' -e 's/ (.//' \| sort -u )
		+	cp -aL $libs2install INITRD/lib
		+
	ln -s INITRD/bin/busybox INITRD/bin/sh		ln -s INITRD/bin/busybox INITRD/bin/sh

Lsuser1985: Created page with "If you are going to have Debian and a RAID on your Linkstation, you'll need a initrd for setting up the root filesystem. '''This page is work in progres…"

Lsuser1985 — Fri, 06 May 2011 12:20:35 GMT

Created page with "If you are going to have Debian and a RAID on your Linkstation, you'll need a initrd for setting up the root filesystem. <span style="color: red">'''This page is work in progres…"

New page

If you are going to have Debian and a RAID on your Linkstation, you'll need a initrd for setting up the root filesystem.

<span style="color: red">'''This page is work in progress'''.</span> While all relevant information is already present, the description is not yet complete. Please have a look here again in a few days.

Basic steps are:
# Create an empty file and mount it as a filesystem to be able to copy data into
# Into this mounted filesystem
## copy the ''linuxrc'' script
## copy all binaries required by ''linuxrc'' plus the libraries required by the binaries
## create all required directories and device nodes required
# unmount the filesystem-file
# compress the file and make an initrd out of

For that you will
# Create a text-file/script ''linuxrc.txt''
# Create a text-file/script ''make-initrd.txt''
# Copy both files to your LS
# Fix the line endings
# Run the script on your LS

Requirements:
* Opened Linkstation
* chroted Debian installation (debbotstrap on the linkstation)

=== Required linuxrc.txt ===

Put this into a textfile called ''linuxrc.txt'':

#!/bin/busybox sh
# linuxrc - to be put into the inted

# Mount the /proc and /sys filesystems.
mount -t proc none /proc
mount -t sysfs none /sys

echo 'DEVICE /dev/sd??*' > /etc/mdadm/mdadm.conf
mdadm -Eb /dev/sd??* >> /etc/mdadm/mdadm.conf
mdadm -As --force

# use /dev/md1 as root
echo "0x901" > /proc/sys/kernel/real-root-dev
# use /dev/md2 as root
#echo "0x902" > /proc/sys/kernel/real-root-dev
# use /dev/sda6 as root
# echo "0x806" > /proc/sys/kernel/real-root-dev
# use /dev/sdb6 as root
# echo "0x822" > /proc/sys/kernel/real-root-dev

# Clean up.
umount /proc
umount /sys

=== File make-initrd.txt ===

Put this into a textfile called ''make-initrd.txt'':

# chroot debian-squeeze
apt-get install --no-install-recommends busybox uboot-mkimage makedev

cd /tmp
rm initrd.gz

dd if=/dev/zero of=initrd bs=1k count=0 seek=3K
mke2fs -F -m 0 -b 1024 initrd
tune2fs -c0 -i0 initrd
mkdir INITRD
mount -o loop initrd INITRD

mkdir -p INITRD/{bin,lib,dev,etc/mdadm,proc,sbin}
cp -a /dev/{null,console,tty,sd{a,b,c,d}?,md*} INITRD/dev/
# ensure sd? and md exits, even if chrooted installation doe not have them
cd INITRD/dev/
MAKEDEV sda sdb sdc sdd md
cd -

cp -aL /bin/busybox INITRD/bin/
cp -aL /sbin/mdadm /sbin/pivot_root INITRD/sbin
# todo: find required libs automatically
cp -aL /lib/{libm.so.6,libc.so.6,libgcc_s.so.1,ld-linux.so.3} INITRD/lib

ln -s INITRD/bin/busybox INITRD/bin/sh

cp ../linuxrx.txt INITRD/linuxrc
chmod +x INITRD/linuxrc

umount INITRD
gzip initrd
mkimage -A arm -O linux -T ramdisk -C gzip -a 0x0 -e 0x0 -n initrd -d initrd.gz initrd.buffalo