From: Lukas Funke <lukas.fu...@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(+)
--
2.30.2
