Hello,
I was working several hours to make my PLD-derived system to boot
with our geninitrd generated initrd.
I had a few problems:
1. my busybox included other shell, which couldn't handle $((...))
Ok, this is my own problem, nothing about PLD
2. the initrd (initramfs in fact) was unable to mount my root device,
which was an LVM volume.
I made two patches (attached) to address the second problem:
1. geninitrd-rootdev.patch
This didn't fix the problem for me, but seems a good fallback: if the
device provided by the "root=" kernel parameter cannot be found, then
use the 'compile time default' (root device known when geninitrd ran)
2. geninitrd-lvm_initramfs.patch
This one disables mounting tmpfs on /dev when initramfs is
used. Using tmpfs inside of initramfs makes no sense, as initramfs
is already a volatile read/write filesystem.
TODO: disable mounting tmpfs on /tmp too (used for LVM stuff)
Also "--mknodes" is added to vgscan invocation -- it should not hurt
in any case, but makes the LVM devices available for mount before
switch_root.
Other comments:
- There are a few "set +x" lines in the generated 'init' scripts which
make initrd/initramfs debugging very hard. 'debuginitrd' option (which
calls 'set -s') won't help, as after the first "set +x" the trace output
is deactivated.
- Do we still need non-initramfs initrd images? Dropping the legacy
would make things much simpler: writtable filesystem (no need for
temporary tmpfs mounts), the image could be generated with no
mknode/mount/chown privileges. Functionality of the initramfs image
could be easily extended by appending other cpio archives to it.
Greets,
Jacek
diff -dur geninitrd-8385.orig/geninitrd geninitrd-8385/geninitrd
--- geninitrd-8385.orig/geninitrd 2007-05-22 10:45:56.000000000 +0000
+++ geninitrd-8385/geninitrd 2007-05-22 10:47:53.000000000 +0000
@@ -1393,11 +1393,15 @@
partition, maj, min);
}
' /proc/partitions)"
-if [ ! -b $device ]; then
+if [ "$device" != '/dev/no_partition_found' -a ! -b $device ]; then
mknod $device b $maj $min
fi
EOF
cat << EOF >> "$s"
+if [ "\$device" = '/dev/no_partition_found' ] ; then
+ device="$rootdev"
+fi
+
mount -t $rootFs -r \$device /newroot
init="\$(busybox awk ' /init=\// { gsub(/.*init=/,NIL,\$0); gsub(/
.*/,NIL,\$0); print \$0; } ' /proc/cmdline )"
if [ -z "\$init" -o ! -x "/newroot\$init" ]; then
diff -dur geninitrd-8385.orig/geninitrd geninitrd-8385/geninitrd
--- geninitrd-8385.orig/geninitrd 2007-05-22 11:18:39.000000000 +0000
+++ geninitrd-8385/geninitrd 2007-05-22 12:37:41.000000000 +0000
@@ -978,6 +978,8 @@
mknod "$MNTIMAGE/dev/console" c 5 1
mknod "$MNTIMAGE/dev/null" c 1 3
mknod "$MNTIMAGE/dev/zero" c 1 5
+mkdir "$MNTIMAGE/dev/pts"
+mkdir "$MNTIMAGE/dev/shm"
s="$RCFILE"
ln -s /linuxrc $MNTIMAGE/init
@@ -1049,6 +1051,10 @@
}
initrd_gen_tmpfs_dev() {
+ if [ "$INITRDFS" = "initramfs" ]; then
+ # initramfs is read-write filesystem, no need for tmpfs
+ return
+ fi
tmpfs_dev=yes
cat <<-EOF
: 'Creating /dev'
@@ -1090,7 +1096,7 @@
cat >> "$s" <<- 'EOF'
killall udevd
umount /proc
- umount /dev
+ umount /dev 2>/dev/null
umount /sys
EOF
fi
@@ -1250,7 +1256,7 @@
echo "lvm vgchange -T -a y $VGVOLUME" >> "$s"
echo "umount /tmp" >> "$s"
# fail to umount
- echo "umount /dev" >> "$s"
+ echo "umount /dev 2>/dev/null" >> "$s"
echo "umount /proc" >> "$s"
else
echo "cat /etc/lvm.conf > /tmp/lvm.conf" >> "$s"
@@ -1281,7 +1287,7 @@
echo 0 > /proc/sys/kernel/printk
: 'Scanning for Volume Groups'
- LVM_SYSTEM_DIR=/tmp lvm vgscan --ignorelockingfailure
2>/dev/null
+ LVM_SYSTEM_DIR=/tmp lvm vgscan --mknodes --ignorelockingfailure
2>/dev/null
: 'Activating Volume Groups'
LVM_SYSTEM_DIR=/tmp lvm vgchange --ignorelockingfailure -a y
$VGVOLUME 2>/dev/null
@@ -1298,7 +1304,7 @@
val=\`expr 256 '*' \$major '+' \$minor\`
echo \$val > /proc/sys/kernel/real-root-dev
umount /tmp
- umount /dev
+ umount /dev 2>/dev/null
umount /proc
EOF
fi
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