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mkefidisk.sh: Allow using a loopback mounted file 

It should be possible to generate a disk to a file using a loopback
device with mkefidisk.sh, which is useful for booting simulators.  To
make this possible the partitions for the loop back need to work
similarly to the mmc devices.  The mkfs.vfat also requires and
additional argument to force it to write to something other then a
real disk.

Example:
  qemu-img create -f raw bigdisk 4G
  dev=`sudo losetup -f`
  sudo losetup $dev bigdisk
  mkefidisk.sh $dev tmp-eglibc/deploy/images/qemux86/core-image-minimal-qemux86.hddimg /dev/sda
  sudo losetup -d $dev

Note:
  Also a bug was fixed in the mkefidisk.sh where if the disk you are
  writing to initially has an invalid label the size of the first
  partition will be computed incorrectly.  For the simulator disk
  creation this is generally always the case, but this can happen with
  real hardware as well.

(From OE-Core rev: 254899824900f2e8c6a34d2ad1b8cbea91acb4ae)

Signed-off-by: Jason Wessel <jason.wessel@windriver.com>
Signed-off-by: Saul Wold <sgw@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
This commit is contained in:
Jason Wessel 2013-09-27 01:01:20 +00:00 committed by Richard Purdie
parent 072c4e123f
commit cf2ebed2ff
1 changed files with 12 additions and 2 deletions
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14
scripts/contrib/mkefidisk.sh
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@ -134,6 +134,11 @@ fi
# Partition $DEVICE
#
DEVICE_SIZE=$(parted $DEVICE unit mb print | grep ^Disk | cut -d" " -f 3 | sed -e "s/MB//")
# If the device size is not reported there may not be a valid label
if [ "$DEVICE_SIZE" = "" ] ; then
parted $DEVICE mklabel msdos
DEVICE_SIZE=$(parted $DEVICE unit mb print | grep ^Disk | cut -d" " -f 3 | sed -e "s/MB//")
fi
SWAP_SIZE=$((DEVICE_SIZE*SWAP_RATIO/100))
ROOTFS_SIZE=$((DEVICE_SIZE-BOOT_SIZE-SWAP_SIZE))
ROOTFS_START=$((BOOT_SIZE))
@ -142,7 +147,7 @@ SWAP_START=$((ROOTFS_END))
# MMC devices use a partition prefix character 'p'
PART_PREFIX=""
if [ ! "${DEVICE#/dev/mmcblk}" = "${DEVICE}" ]; then
if [ ! "${DEVICE#/dev/mmcblk}" = "${DEVICE}" ] || [ ! "${DEVICE#/dev/loop}" = "${DEVICE}" ]; then
PART_PREFIX="p"
fi
BOOTFS=$DEVICE${PART_PREFIX}1
@ -197,7 +202,12 @@ unmount_device
#
echo ""
echo "Formatting $BOOTFS as vfat..."
mkfs.vfat $BOOTFS -n "efi"
if [ ! "${DEVICE#/dev/loop}" = "${DEVICE}" ]; then
mkfs.vfat -I $BOOTFS -n "efi"
else
mkfs.vfat $BOOTFS -n "efi"
fi
echo "Formatting $ROOTFS as ext3..."
mkfs.ext3 $ROOTFS -L "root"