Boot: Add 'revert' support to direct-xip mode
The 'revert' mechanism in direct-xip is similar to the one in swap mode.
It requires the trailer magic to be added to the signed image. When a
reboot happens without the image being confirmed at runtime (without the
image_ok flag being set), the bootloader considers the image faulty and
erases it. After this it will attempt to boot the previous image
instead. The images can also be made permanent (marked as confirmed in
advance) just like in swap mode.
Change-Id: Ibde9361d4a7302dd8efbb277b691b71eca0ca877
Signed-off-by: David Vincze <david.vincze@linaro.org>
diff --git a/boot/zephyr/Kconfig b/boot/zephyr/Kconfig
index 3f2374b..1386f5e 100644
--- a/boot/zephyr/Kconfig
+++ b/boot/zephyr/Kconfig
@@ -224,9 +224,18 @@
mode results in a simpler code path and smaller code size.
endchoice
-endif
-if !SINGLE_APPLICATION_SLOT
+config BOOT_DIRECT_XIP_REVERT
+ bool "Enable the revert mechanism in direct-xip mode"
+ default n
+ help
+ If y, enables the revert mechanism in direct-xip similar to the one in
+ swap mode. It requires the trailer magic to be added to the signed image.
+ When a reboot happens without the image being confirmed at runtime, the
+ bootloader considers the image faulty and erases it. After this it will
+ attempt to boot the previous image. The images can also be made permanent
+ (marked as confirmed in advance) just like in swap mode.
+
config BOOT_BOOTSTRAP
bool "Bootstrap erased the primary slot from the secondary slot"
default n
@@ -276,7 +285,7 @@
back when swapping from the primary slot to the secondary slot. The
encryption mechanism used in this case is ECIES using primitives
described under "ECIES-X25519 encryption" in docs/encrypted_images.md.
-endif
+endif # !SINGLE_APPLICATION_SLOT
config BOOT_MAX_IMG_SECTORS
int "Maximum number of sectors per image slot"