initramfs: set baudrate for grub from cmdline

* take the baudrate for the grub serial console setting
  from the kernel-cmdline which the system was booted from

* better parsing of the options which the install-script
  gets from init

* Video Mode, VGA mode are not used right now and make it
  empty right now.

recipes-core/initrdscripts/files/init-install.sh

@@ -9,9 +9,32 @@ PATH=/sbin:/bin:/usr/sbin:/usr/bin
 # We want a 1 Gig partition on the cf
 partition_size=1000
 
+# Parse original arguments coming from the kernel cmdline.
+# Then shift the first two arguments which contains
+# partition information.
+dev_name=$1
+shift
+image_name=$1
+shift
+
+kernel_cmdline_console=""
+kernel_cmdline_video_mode=""
+kernel_cmdline_vga_mode=""
+
+while [ "$1" != "" ]; do
+
+    echo "$1" | grep -q "console="
+    success_console=$?
+    if [ $success_console -eq 0 ]; then
+        kernel_cmdline_console=$1
+    fi
+    shift
+
+done
+
 # Get a list of hard drives
 hdnamelist=""
-live_dev_name=${1%%/*}
+live_dev_name=${dev_name%%/*}
 
 echo "Searching for hard drives ..."
 
@@ -120,7 +143,7 @@ mkdir /tgt_root
 mkdir -p /boot
 
 echo "Copying rootfs files..."
-dd if=/media/$1/$2 of=$rootfs bs=1024
+dd if=/media/$dev_name/$image_name of=$rootfs bs=1024
 
 # Handling of the target root partition
 mount $rootfs /tgt_root
@@ -139,11 +162,13 @@ echo "Preparing boot partition..."
 GRUBCFG="/boot/grub/grub.cfg"
 mkdir -p $(dirname $GRUBCFG)
 
+baudrate=`echo $kernel_cmdline_console | cut -f 2 -d ',' | cut -f 1 -d 'n'`
+
 cat > $GRUBCFG << EOF
 default=0
 timeout=1
 
-serial --unit=0 --speed=38400
+serial --unit=0 --speed=$baudrate
 terminal --timeout=2 serial
 
 terminal_input --append  serial
@@ -155,9 +180,9 @@ if [ -f /etc/grub.d/40_custom ] ; then
 
     cat /etc/grub.d/40_custom >> $GRUBCFG
     sed -i "s@__ROOTFS__@$rootfs $rootwait@g" $GRUBCFG
-    sed -i "s/__VIDEO_MODE__/$3/g" $GRUBCFG
-    sed -i "s/__VGA_MODE__/$4/g" $GRUBCFG
-    sed -i "s/__CONSOLE__/$5/g" $GRUBCFG
+    sed -i "s/__VIDEO_MODE__/$kernel_cmdline_video_mode/g" $GRUBCFG
+    sed -i "s/__VGA_MODE__/$kernel_cmdline_vga_mode/g" $GRUBCFG
+    sed -i "s/__CONSOLE__/$kernel_cmdline_console/g" $GRUBCFG
     sed -i "s/quiet/net.ifnames=0 quiet/g" $GRUBCFG
     sed -i "s/rw/ro/g" $GRUBCFG
     sed -i "/#/d" $GRUBCFG