classes/concatenated-image.bbclass

   1
   2 #
   3 # define the FLASH_KERNEL_SIZE and FLASH_ROOT_SIZE in your machine.conf,
   4 # and this class builds a simple, padded concatenated image of
   5 # <kernel><padding><rootfs> and performs error checking that either
   6 # kernel or rootfs isn't too large to fit.
   7 #
   8 concat_pack_image() {
   9         # find latest kernel - is there a more general way to do this?
  10         KERNEL=`ls -tr ${DEPLOY_DIR_IMAGE}/${KERNEL_IMAGETYPE}* | tail -n 1`
  11         if [ -z "$KERNEL" ]; then
  12                 oefatal "No kernel found in ${DEPLOY_DIR_IMAGE}.  Was expecting a ${KERNEL_IMAGETYPE}\* file."
  13                 exit 1
  14         fi
  15         ROOTFS=${DEPLOY_DIR_IMAGE}/${IMAGE_NAME}.rootfs.jffs2
  16         OUTPUT=${DEPLOY_DIR_IMAGE}/${IMAGE_NAME}.flash.img
  17         PADFILE=${DEPLOY_DIR_IMAGE}/padfile.zzz
  18         KERNEL_SIZE_MAX_DEC=`echo ${FLASH_KERNEL_SIZE} | awk --non-decimal-data '{printf "%d\n", $1}' `
  19         ROOT_SIZE_MAX_DEC=`echo ${FLASH_ROOT_SIZE} | awk --non-decimal-data '{printf "%d\n", $1}' `
  20         KERNEL_SIZE=`ls -l $KERNEL | awk '{print $5}'`
  21         if [ $KERNEL_SIZE -gt $KERNEL_SIZE_MAX_DEC ]; then
  22                 oefatal "Kernel too large at $KERNEL_SIZE bytes.  Max is $KERNEL_SIZE_MAX_DEC."
  23                 exit 1
  24         fi
  25         ROOT_SIZE=`ls -l $ROOTFS | awk '{print $5}'`
  26         if [ $ROOT_SIZE -gt $ROOT_SIZE_MAX_DEC ]; then
  27                 oefatal "Rootfs is too large at $ROOT_SIZE bytes.  Max is $ROOT_SIZE_MAX_DEC."
  28                 exit 1
  29         fi
  30         PAD_SIZE=`echo "$KERNEL_SIZE_MAX_DEC - $KERNEL_SIZE" | bc `
  31         dd if=/dev/zero of=$PADFILE bs=$PAD_SIZE count=1 2>>/dev/null
  32         cat $KERNEL $PADFILE $ROOTFS > $OUTPUT
  33         rm -f $PADFILE
  34         ls -l $OUTPUT
  35 }
  36
  37 IMAGE_POSTPROCESS_COMMAND += "concat_pack_image; "
  38