cmake: mcuboot: respect alignment size when signing for ramload mode

When signing for ramload mode, respect the write alignment size setting.
This is required when creating a confirmed image, as the BOOT_MAGIC
value changes based on the alignment size in use.

Signed-off-by: Daniel DeGrasse <[email protected]>

Author: danieldegrasse

cmake/mcuboot.cmake

@@ -130,7 +130,8 @@ function(zephyr_mcuboot_tasks)
     dt_nodelabel(slot1_partition NODELABEL "slot1_partition" REQUIRED)
     dt_reg_addr(slot1_partition_address PATH ${slot1_partition})
 
-    set(imgtool_args --align 1 --load-addr ${chosen_ram_address} ${imgtool_args})
+    dt_prop(write_block_size PATH "${flash_node}" PROPERTY "write-block-size")
+    set(imgtool_args --align ${write_block_size} --load-addr ${chosen_ram_address} ${imgtool_args})
     set(imgtool_args_alt_slot ${imgtool_args} --hex-addr ${slot1_partition_address})
     set(imgtool_args ${imgtool_args} --hex-addr ${slot0_partition_address})
   elseif(CONFIG_MCUBOOT_BOOTLOADER_MODE_SINGLE_APP_RAM_LOAD)