image.bbclass: change IMAGE_EXTRA_SPACE to IMAGE_OVERHEAD_FACTOR

This change allows the IMAGE_OVERHEAD_FACTOR (default to 1.2) to
adjust dynamicly how much space to add for each image, thus there
is 20% overhead space by default.

Signed-off-by: Saul Wold <Saul.Wold@intel.com>

1 files changed, 5 insertions, 1 deletions

diff --git a/meta/conf/bitbake.conf b/meta/conf/bitbake.conf
index d54aa35b82..f6eee7d2af 100644
--- a/meta/conf/bitbake.conf
+++ b/meta/conf/bitbake.conf
@@ -317,7 +317,11 @@ IMAGE_ROOTFS = "${WORKDIR}/rootfs"
 IMAGE_BASENAME = "${PN}"
 IMAGE_NAME = "${IMAGE_BASENAME}-${MACHINE}-${DATETIME}"
 IMAGE_LINK_NAME = "${IMAGE_BASENAME}-${MACHINE}"
-IMAGE_EXTRA_SPACE ?= 81920
+
+# This option allows for a precentage overage of the actaul image size rather than a
+# fixed extra space
+IMAGE_OVERHEAD_FACTOR ?= 1.2
+
 # Comment this option if you want default genext2fs behavior (i.e. create minimal inode number)
 IMAGE_EXTRA_OPTION ?= "-i 8192"