From 4fd9623534b211c96231c27f158ccb3d0522bb9f Mon Sep 17 00:00:00 2001 From: Petr Buchta Date: Sat, 24 Feb 2024 08:10:38 +0100 Subject: [PATCH] New OVERWRITE_ONLY_KEEP_BACKUP option It builds on top of OVERWRITE_ONLY mode and uses secondary slot as a backup of the primary slot. The main difference is that after image copy to the primary slot the secondary slot is not erased. This is meant to be used together with BOOTSTRAP option that will reinstall the primary image with the backup in case it's not valid. --- boot/bootutil/src/loader.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/boot/bootutil/src/loader.c b/boot/bootutil/src/loader.c index 8bbabbbacc..88e467ea25 100644 --- a/boot/bootutil/src/loader.c +++ b/boot/bootutil/src/loader.c @@ -1215,6 +1215,7 @@ boot_copy_image(struct boot_loader_state *state, struct boot_status *bs) } #endif /* MCUBOOT_HW_ROLLBACK_PROT */ +#ifndef MCUBOOT_OVERWRITE_ONLY_KEEP_BACKUP /* * Erases header and trailer. The trailer is erased because when a new * image is written without a trailer as is the case when using newt, the @@ -1225,6 +1226,8 @@ boot_copy_image(struct boot_loader_state *state, struct boot_status *bs) boot_img_sector_off(state, BOOT_SECONDARY_SLOT, 0), boot_img_sector_size(state, BOOT_SECONDARY_SLOT, 0)); assert(rc == 0); +#endif + last_sector = boot_img_num_sectors(state, BOOT_SECONDARY_SLOT) - 1; BOOT_LOG_DBG("erasing secondary trailer"); rc = boot_erase_region(fap_secondary_slot,