These patches introduce the ability to amend the default environment baked into the U-Boot binary by a DT property under /config. This is useful to create a few different images based on the same U-Boot binary, e.g. one for normal use, one for development and one for bootstrapping the board. It's also useful when SPL loads U-Boot from a FIT image and decides between multiple possible control DTBs; those control DTBs can then contain tweaks of the default environment suitable for that particular board variant.
There are already various /config/ properties one can use for some of this; e.g. /config/bootdelay overrides any bootdelay set in the environment. This is intended as a flexible way to achieve these kinds of tweaks instead of adding more /config/* properties. [It should be noted that adding "bootdelay=123" to /config/default-environment is not a drop-in replacement for setting /config/bootdelay to 123, as the latter takes effect whether the environment is the default one or one loaded from storage.] It does not affect the case where an environment is loaded from a storage device, nor is there any change if the new CONFIG_ option is not selected. Rasmus Villemoes (5): fdtdec: make fdtdec_get_config_string() return const char* fdtdec: introduce fdtdec_get_config_property env: make env_set_default_vars() return void env: allow default environment to be amended from control dtb test: add tests for default environment arch/arm/mach-exynos/include/mach/mipi_dsim.h | 2 +- arch/arm/mach-rockchip/rk3188/rk3188.c | 2 +- board/dhelectronics/dh_stm32mp1/board.c | 2 +- board/firefly/firefly-rk3288/firefly-rk3288.c | 2 +- board/st/stm32mp1/stm32mp1.c | 2 +- cmd/nvedit.c | 37 +++++++ common/cli.c | 2 +- configs/sandbox64_defconfig | 1 + configs/sandbox_defconfig | 1 + env/Kconfig | 21 ++++ env/common.c | 23 +++- include/configs/sandbox.h | 8 +- include/env.h | 2 +- include/fdtdec.h | 16 ++- lib/fdtdec.c | 29 +++-- test/env/Makefile | 1 + test/env/default.c | 102 ++++++++++++++++++ 17 files changed, 227 insertions(+), 26 deletions(-) create mode 100644 test/env/default.c -- 2.23.0
