wic: allow to configure overhead factor per partition

Introduce a new option --overhead-factor to replace
IMAGE_OVERHEAD_FACTOR.

(From OE-Core rev: 20fe0c7202724187dbe80eb2101d8ef69e86b94e)

Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

1 files changed, 6 insertions, 0 deletions

diff --git a/scripts/lib/image/help.py b/scripts/lib/image/help.py
index 8e026986aa..e1eb265979 100644
--- a/scripts/lib/image/help.py
+++ b/scripts/lib/image/help.py
@@ -749,6 +749,12 @@ DESCRIPTION
                         beyond the size specified by --size.
                         By default, 10MB.
 
+         --overhead-factor: This option is specific to wic. The
+                            size of the partition is multiplied by
+                            this factor. It has to be greater than or
+                            equal to 1.
+                            The default value is 1.3.
+
     * bootloader
 
       This command allows the user to specify various bootloader