From: Lukas Funke lukas.funke@weidmueller.com
This series enables U-Boot to import environment variables from the selectd FIT configuration. One use-case is that the overall build process enriches the FIT configuration node with dm-verity information which should be injected into the kernel commandline. U-Boot will then read these (possibly signed) environment variables and put them into the actual Kernel commandline using variable replacement (see CONFIG_BOOTARGS_SUBST).
Example:
Config: CONFIG_BOOTARGS_SUBST=y CONFIG_ENV_IMPORT_FIT_CONF=y
FIT: configurations { default = "conf-1"; conf-1 { kernel = "kernel-1"; fdt = "fdt-1"; env,dm-verity-args = "dm-mod.create=..."; env,bar = "someothervalue"; }; };
U-Boot cmdline: => env set bootargs="rootfstype=squashfs root=/dev/xyz ${dm-verity-args} ro" => boot
Kernel cmdline: Kernel command line: rootfstype=squashfs ... dm-mod.create= ...
Lukas Funke (2): env: Add function to import environment variables from FIT conf node test: fit: Add test to check environment extraction from FIT conf node
boot/image-fit.c | 4 ++++ configs/sandbox_defconfig | 1 + env/Kconfig | 10 +++++++++ env/common.c | 28 ++++++++++++++++++++++++ include/env.h | 11 ++++++++++ test/py/tests/test_fit.py | 45 +++++++++++++++++++++++++++++++++++++++ 6 files changed, 99 insertions(+)