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config: bootloader: Add support for MCUboot

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Add a new Kconfig option, BOOTLOADER_MCUBOOT, that automatically sets
the required options necessary to make the resulting image bootable by
the MCUboot open source bootloader. This includes the text section
offset and the vector relay table for Cortex-M0, and in the future it
might also add the DTS overlay required to link at slot0 offset in
flash.

Signed-off-by: Carles Cufi <carles.cufi@nordicsemi.no>
This commit is contained in:
Carles Cufi 2018-01-29 17:48:47 +01:00 • committed by Anas Nashif
commit 7361d3d74d
2 changed files with 20 additions and 2 deletions
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1
arch/arm/core/cortex_m/Kconfig
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@ -194,6 +194,7 @@ config SW_VECTOR_RELAY
bool
prompt "Enable Cortex-M0 Vector Table soft relay"
default n
default y if BOOTLOADER_MCUBOOT
depends on CPU_CORTEX_M0 && !CPU_CORTEX_M0_HAS_VECTOR_TABLE_REMAP
help
Add Cortex-M0 Vector Table relay handler and relay vector table, to

21
misc/Kconfig
View file

@ -44,9 +44,16 @@ endif
config TEXT_SECTION_OFFSET
hex "TEXT section offset"
default 0
default 0x200 if BOOTLOADER_MCUBOOT
help
This sets and offset before the text section and allows booting images
with custom headers that are inserted at the beginning of the image.
If the application is built for chain-loading by a bootloader this
variable is required to be set to value that leaves sufficient
space between the beginning of the image and the start of the .text
section to store an image header or any other metadata.
In the particular case of the MCUboot bootloader this reserves enough
space to store the image header, which should also meet vector table
alignment requirements on most ARM targets, although some targets
may require smaller or larger values.
config HAVE_CUSTOM_LINKER_SCRIPT
prompt "Custom linker scripts provided"
@ -273,6 +280,16 @@ config BOOTLOADER_SRAM_SIZE
This option specifies the amount of SRAM (measure in kB) reserved for
when Zephyr is to act as a bootloader.
config BOOTLOADER_MCUBOOT
bool
prompt "MCUboot bootloader support"
default n
help
This option signifies that the target uses MCUboot as a bootloader,
or in other words that the image is to be chain-loaded by MCUboot.
This sets several required options in order for the image generated
to be bootable using the MCUboot open source bootloader.
config BOOTLOADER_KEXEC
bool
prompt "Boot using Linux kexec() system call"