rework board detection

[openwrt/staging/yousong.git] / scripts / pad_image

diff --git a/scripts/pad_image b/scripts/pad_image
new file mode 100755 (executable)
index 0000000..14f1499
--- /dev/null
+++ b/scripts/pad_image
@@ -0,0 +1,100 @@
+#!/bin/bash
+
+function usage {
+  echo "Usage: prepare_image image_type kernel_image rootfs_image header_size"
+  echo "Padd root and kernel image to the correct size and append the jffs2 start marker as needed"
+  exit 1
+}
+
+function pad_file {
+       echo "Padding $1 to size $2"
+       dd if=$1 of=$1.paddingtempfile bs=$2 count=1 conv=sync &> /dev/null
+       mv $1.paddingtempfile $1
+}
+
+#filesize filestart padding
+function calc_pad {
+       [  $((($1 + $2) & ($3 - 1))) == 0 ] && {
+               echo $1
+               return 0
+        }
+       echo $(((($1 + $2) | ($3 - 1)) + 1 - $2))
+}
+
+function prep_squash {
+       echo "kernel_size: $kernel_size"
+       echo "header_size: $header_size"
+       kernel_pad_size=$(calc_pad $kernel_size $header_size 32)
+       kernel_end=$(($header_size + $kernel_pad_size))
+       pad_file $kernel_image $kernel_pad_size
+
+       #4k
+       rootfs_pad_size=$(calc_pad $rootfs_size $kernel_end 4096)
+       pad_file $rootfs_image $rootfs_pad_size
+       echo -ne '\xde\xad\xc0\xde' >> $rootfs_image
+       
+       #8k
+       rootfs_pad_size=$(calc_pad $rootfs_size $kernel_end 8192)
+       [ $rootfs_pad_size == rootfs_old_padsize ] || {
+               pad_file $rootfs_image $rootfs_pad_size
+               rootfs_old_padsize=$rootfs_pad_size
+               echo -ne '\xde\xad\xc0\xde' >> $rootfs_image
+       }
+
+       #64k
+       rootfs_pad_size=$(calc_pad $rootfs_size $kernel_end 65536)
+       [ $rootfs_pad_size == rootfs_old_padsize ] || {
+               pad_file $rootfs_image $rootfs_pad_size
+               rootfs_old_padsize=$rootfs_pad_size
+               echo -ne '\xde\xad\xc0\xde' >> $rootfs_image
+       }
+
+       #128k
+       rootfs_pad_size=$(calc_pad $rootfs_size $kernel_end 131072)
+       [ $rootfs_pad_size == rootfs_old_padsize ] || {
+               pad_file $rootfs_image $rootfs_pad_size
+               rootfs_old_padsize=$rootfs_pad_size
+               echo -ne '\xde\xad\xc0\xde' >> $rootfs_image
+       }
+       
+}
+
+function prep_jffs2 {
+       kernel_pad_size=$(calc_pad $kernel_size $header_size $1)
+       pad_file $kernel_image $kernel_pad_size
+}
+
+image_type=$1
+kernel_image=$2
+rootfs_image=$3
+header_size=$4
+
+if [ -z "$image_type" ] || [ -z "$rootfs_image" ] || [ -z "$kernel_image" ] || [ -z "$header_size" ]; then
+       usage
+fi
+
+if [ ! -e "$rootfs_image" ] || [ -z "$kernel_image" ]; then
+       echo "input file not found"
+       exit 1
+fi
+
+kernel_size=$(stat -c "%s" "$kernel_image")
+rootfs_size=$(stat -c "%s" "$rootfs_image")
+
+if [ $kernel_size == 0 ] || [ $rootfs_size == 0 ]; then
+       echo "kernel or rootfs empty"
+       exit 1
+fi
+
+case $image_type in
+       squashfs )
+               prep_squash ;;
+       jffs2-64k )
+               prep_jffs2 65536 ;;
+       jffs2-128k )
+               prep_jffs2 131072 ;;
+       * )
+               echo "Unknown image type"
+               exit 1 ;;
+esac
+