[LEDE-DEV] [RFC 3/7] image: pass device blocksize to padjffs2

[Mathias Kresin]

At the moment the padding steps are hardcoded. Especially images for
devices with a 4K sector size can be unnecessarily bloated using the
hardcoded padding steps.

It has been observed that 192Kb of padding was added to the image of a
4MB device, albeit due to the 4K sector size the minimum required extra
padding for the jffs2 rootfs_data is 20Kb.

In worst case it means that the image-size check could fail albeit
there is enough space for all selected packages

For device build code not exposing the blocksize, use the hardcoded
padding further on.

Signed-off-by: Mathias Kresin <dev at kresin.me>
---
 include/image-commands.mk | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/include/image-commands.mk b/include/image-commands.mk
index 3b9ea3c..76e42ab 100644
--- a/include/image-commands.mk
+++ b/include/image-commands.mk
@@ -131,7 +131,8 @@ define Build/pad-to
 endef
 
 define Build/pad-rootfs
-	$(STAGING_DIR_HOST)/bin/padjffs2 $@ $(1) 4 8 16 64 128 256
+	$(STAGING_DIR_HOST)/bin/padjffs2 $@ $(1) \
+		$(if $(BLOCKSIZE),$(BLOCKSIZE:%k=%),4 8 16 64 128 256)
 endef
 
 define Build/pad-offset
-- 
2.7.4