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Frantisek Hrbata
6416f75581
Add CMakeLists_v2.txt to the bootloader subproject, implementing the
bootloader build using the new cmakev2 IDF build framework.
The file covers the full bootloader build pipeline:
- Sets PROJECT_COMPONENTS_SOURCE to "idf_components" so that the
subproject's built-in components (main/, components/) are treated as
IDF components (priority 0) rather than project components (priority
3). This preserves the cmakev1 behaviour where user-supplied
components in bootloader_components/ can override the built-in ones.
- Registers optional user-supplied bootloader components from the
application project's bootloader_components/ directory, with support
for selectively excluding individual components via
IGNORE_EXTRA_COMPONENT.
- Bootstraps the cmakev2 framework (idf.cmake) and initialises the
project with BOOTLOADER_BUILD and NON_OS_BUILD properties, which are
also exposed as C preprocessor definitions.
- Sets GENERATE_SDKCONFIG to 0 to prevent the bootloader subproject
from regenerating the main project's sdkconfig, as the bootloader
has a different set of components and hence different Kconfig files.
- Sets the common implicit component dependencies shared by every
bootloader component (log, esp_rom, esp_common, esp_hw_support,
esp_libc, arch-specific component).
- Applies the compiler options specific for bootloader
- Selects the correct target-specific linker script, including a
separate script for ESP32-P4 silicon revisions < v3.
- Links the bootloader ELF via idf_build_executable and then converts it
to a flat binary via one of three paths depending on the secure boot
configuration:
* No secure boot: plain binary + size check + metadata.
* Secure Boot V1 one-time-flash: plain binary with post-build
instructions showing the esptool.py flash command.
* Secure Boot V1 reflashable: derives the symmetric eFuse key from
the ECDSA signing key, produces the reflash-digest image, and
prints burn/flash instructions.
* Secure Boot V2: produces an unsigned binary, optionally signs it
with the configured signing key (RSA-PSS 3072, ECDSA P-256, or
ECDSA P-384) via idf_sign_binary, and prints flash/multi-key
signing instructions.
- Adds comprehensive inline documentation explaining each section's
purpose, the rationale behind individual flags, and the relationships
between Kconfig symbols and generated artefacts.
Signed-off-by: Frantisek Hrbata <frantisek.hrbata@espressif.com>