bcm27xx: pass signature to partition generation

Passes IMG_PART_SIGNATURE to ptgen instead of using the default "OWRT"
signature.

Signed-off-by: Álvaro Fernández Rojas <[email protected]>

target/linux/bcm27xx/image/Makefile

@@ -49,6 +49,7 @@ define Build/boot-2711
 endef
 
 define Build/sdcard-img
+	SIGNATURE="$(IMG_PART_SIGNATURE)" \
 	./gen_rpi_sdcard_img.sh $@ [email protected] $(IMAGE_ROOTFS) \
 		$(CONFIG_TARGET_KERNEL_PARTSIZE) $(CONFIG_TARGET_ROOTFS_PARTSIZE)
 endef

target/linux/bcm27xx/image/gen_rpi_sdcard_img.sh

@@ -19,7 +19,7 @@ kernel_type=c
 rootfs_type=83
 sect=63
 
-set $(ptgen -o $OUTPUT -h $head -s $sect -l $align -t $kernel_type -p ${BOOTFSSIZE}M -t $rootfs_type -p ${ROOTFSSIZE}M)
+set $(ptgen -o $OUTPUT -h $head -s $sect -l $align -t $kernel_type -p ${BOOTFSSIZE}M -t $rootfs_type -p ${ROOTFSSIZE}M ${SIGNATURE:+-S 0x$SIGNATURE})
 
 BOOTOFFSET="$(($1 / 512))"
 ROOTFSOFFSET="$(($3 / 512))"