On 12/06/2019 10.43, Stefano Babic wrote: > Hi Pascal, > > On 12/06/19 10:20, Linder Pascal wrote: >> Hi everyone, >> >> >> I am currently moving the configurations of the KM boards from header files >> to Kconfig. But for the customly defined environment variables I did not >> found a decent solution until I have come across the default environment >> file, which seems very interesting to me. >> >> >> To this day, nevertheless, it appears that noone made use of the >> CONFIG_USE_DEFAULT_ENV_FILE configuration defined in env/Kconfig. Does >> anyone still have an example for this kind of environment definition or >> knows how to create it? >> >> >> In my opinion, this could be highly relevant for the transition away from >> the header files in include/configs. >> > > Fully agree. Rather, I do not think there is a relevant example. But the > environment is something like data and should not be part of the header > file as it is for histoical reason. I added some times ago a way to > extract the environment from the header and make the transition easy > (see make u-boot-initial-env). And if the environment is split from the > header as CONFIG_USE_DEFAULT_ENV_FILE allows, it is also easier to set > an own environment via OE BSP layer without pushing for each small > change to U-Boot. Not only, environments often conflict, and what is > good for a project becomes evil for another one.
Yup. FWIW, here's a small snippet from our Yocto recipe that creates the default env file: ENV_INPUT = "common.txt board.txt" ENV_INPUT_append_basic-test = " testctrl.txt" python do_configure() { import fileinput with open("uboot.txt", "w") as out: for line in fileinput.input(files=d.getVar("ENV_INPUT").split()): line = d.expand(line) # Strip backslash-newline if line.endswith("\\\n"): line = line[:-2] out.write(line) } The line = d.expand(line) allows us to use ${SOME_BITBAKE_VARIABLE} in the input files and have them replaced appropriately - this can be quite useful to e.g. configure a tftp server address differently. Rasmus _______________________________________________ U-Boot mailing list U-Boot@lists.denx.de https://lists.denx.de/listinfo/u-boot