bcm4908: pad firmware image bootfs JFFS2 partition to 8 MiB

This way MTD "bootfs" partition will be always 8+ MiB. This should be
enough for any custom / future firmware to fit its bootfs (e.g. big
kernel) without having to repertition whole flash. That way we can
preserve UBI and its erase counters during sysupgrade.

Signed-off-by: Rafał Miłecki <[email protected]>

target/linux/bcm4908/image/Makefile

@@ -20,7 +20,7 @@ define Build/bcm4908img
 	cp $(KDIR)/bcm63xx-cfe/$(subst _,$(comma),$(DEVICE_NAME))/cferam.000 $@-bootfs/
 	cp $(IMAGE_KERNEL) $@-bootfs/vmlinux.lz
 
-	$(STAGING_DIR_HOST)/bin/mkfs.jffs2 --pad --little-endian --squash-uids \
+	$(STAGING_DIR_HOST)/bin/mkfs.jffs2 --pad=0x800000 --little-endian --squash-uids \
 		-v -e 128KiB -o [email protected] -d $@-bootfs -m none -n
 	$(STAGING_DIR_HOST)/bin/bcm4908img create [email protected] -f [email protected] \
 		-a 0x20000 -f $@