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wolfBoot
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Code Issues Releases Wiki Activity

Added DISABLE_BACKUP option

update-flags-in-boot-partition
Daniele Lacamera 2020-09-14 16:31:07 +02:00
parent f6252917d4
commit b0fbafe014
4 changed files with 39 additions and 1 deletions
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9
docs/compile.md
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@ -120,6 +120,15 @@ stage, or on these platform that do not support interrupt vector relocation.
To disable interrupt vector table relocation, compile with `VTOR=0`. By default, wolfBoot will relocate the
interrupt vector by setting the offset in the vector relocation offset register (VTOR).
### Disable Backup of current running firmware
Optionally, it is possible to disable the backup copy of the current running firmware upon the installation of the
update. This implies that no fall-back mechanism is protecting the target from a faulty firmware installation, but may be useful
in some cases where it is not possible to write on the update partition from the bootloader.
The associated compile-time option is
`DISABLE_BACKUP=1`
### Enable workaround for 'write once' flash memories
On some microcontrollers, the internal flash memory does not allow subsequent writes (adding zeroes) to a

3
options.mk
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@ -138,6 +138,9 @@ ifeq ($(NVM_FLASH_WRITEONCE),1)
CFLAGS+= -DNVM_FLASH_WRITEONCE
endif
ifeq ($(DISABLE_BACKUP),1)
CFLAGS+= -DDISABLE_BACKUP
endif
ifeq ($(DEBUG),1)

25
src/loader.c
View File

@ -119,6 +119,8 @@ static int wolfBoot_update(int fallback_allowed)
ext_flash_unlock();
#endif
#ifndef DISABLE_BACKUP
/* Interruptible swap
* The status is saved in the sector flags of the update partition.
* If something goes wrong, the operation will be resumed upon reboot.
@ -158,6 +160,29 @@ static int wolfBoot_update(int fallback_allowed)
wb_flash_erase(&swap, 0, WOLFBOOT_SECTOR_SIZE);
st = IMG_STATE_TESTING;
wolfBoot_set_partition_state(PART_BOOT, st);
#else /* DISABLE_BACKUP */
#warning "Backup mechanism disabled! Update installation will not be interruptible"
/* Directly copy the content of the UPDATE partition into the BOOT partition.
* This mechanism is not fail-safe, and will brick your device if interrupted
* before the copy is finished.
*/
while ((sector * sector_size) < total_size) {
if ((wolfBoot_get_sector_flag(PART_UPDATE, sector, &flag) != 0) || (flag == SECT_FLAG_NEW)) {
flag = SECT_FLAG_SWAPPING;
wolfBoot_copy_sector(&update, &boot, sector);
if (((sector + 1) * sector_size) < WOLFBOOT_PARTITION_SIZE)
wolfBoot_set_sector_flag(PART_UPDATE, sector, flag);
}
}
while((sector * sector_size) < WOLFBOOT_PARTITION_SIZE) {
wb_flash_erase(&boot, sector * sector_size, sector_size);
sector++;
}
st = IMG_STATE_SUCCESS;
wolfBoot_set_partition_state(PART_BOOT, st);
#endif
#ifdef EXT_FLASH
ext_flash_lock();
#endif

3
tools/config.mk
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@ -23,6 +23,7 @@ ifeq ($(ARCH),)
UART_FLASH?=0
ALLOW_DOWNGRADE?=0
NVM_FLASH_WRITEONCE?=0
DISABLE_BACKUP?=0
WOLFBOOT_VERSION?=0
V?=0
NO_MPU?=0
@ -50,7 +51,7 @@ endif
CONFIG_VARS:= ARCH TARGET SIGN HASH MCUXPRESSO MCUXPRESSO_CPU MCUXPRESSO_DRIVERS \
MCUXPRESSO_CMSIS FREEDOM_E_SDK STM32CUBE CYPRESS_PDL CYPRESS_CORE_LIB CYPRESS_TARGET_LIB DEBUG VTOR \
CORTEX_M0 NO_ASM EXT_FLASH SPI_FLASH NO_XIP UART_FLASH ALLOW_DOWNGRADE NVM_FLASH_WRITEONCE \
WOLFBOOT_VERSION V NO_MPU ENCRYPT FLAGS_HOME \
DISABLE_BACKUP WOLFBOOT_VERSION V NO_MPU ENCRYPT FLAGS_HOME \
SPMATH RAM_CODE DUALBANK_SWAP IMAGE_HEADER_SIZE PKA PSOC6_CRYPTO WOLFTPM \
WOLFBOOT_PARTITION_SIZE WOLFBOOT_SECTOR_SIZE \
WOLFBOOT_PARTITION_BOOT_ADDRESS WOLFBOOT_PARTITION_UPDATE_ADDRESS \