wic: allow to configure extra space per partition

Introduce a new option --extra-space instead of using IMAGE_EXTRA_SPACE.
This is useful for boot partitions where the extra space is often
useless or for huge partition where 10MiB may not be enough.

(From OE-Core rev: 9f7fe71a10bcdd1864d2f838f3510e96810ef42e)

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 aab0b609af..8e026986aa 100644
--- a/scripts/lib/image/help.py
+++ b/scripts/lib/image/help.py
@@ -743,6 +743,12 @@ DESCRIPTION
                      partition table. It may be useful for
                      bootloaders.
 
+         --extra-space: This option is specific to wic. It adds extra
+                        space after the space filled by the content
+                        of the partition. The final size can go
+                        beyond the size specified by --size.
+                        By default, 10MB.
+
     * bootloader
 
       This command allows the user to specify various bootloader