Dear Simon,
In message
<20211021210847.v10.3.Ie78bfbfca0d01d9cba501e127f446ec48e1f7afe@changeid> you
wrote:
> At present U-Boot environment variables, and thus scripts, are defined
> by CONFIG_EXTRA_ENV_SETTINGS. It is painful to add large amounts of text
> to this file and dealing with quoting and newlines is harder than it
> should be. It would be better if we could just type the script into a
> text file and have it included by U-Boot.
>
> Add a feature that brings in a .env file associated with the board
> config, if present. To use it, create a file in a board/<vendor>
> directory, typically called <board>.env and controlled by the
> CONFIG_ENV_SOURCE_FILE option.
>
> The environment variables should be of the form "var=value". Values can
> extend to multiple lines. See the README under 'Environment Variables:'
> for more information and an example.
The README does not contain this information as it has been moved
into doc/usage/environment.rst
I think the documentation is lacking a hint that multiline
definitions will always be separated by spaces.
> Also support += to allow variables to be appended to. This is needed when
> using the preprocessor.
I cannot see what the preprocessor has to do with this feature. It
would be useful in any case, even without the preporcessor.
The documentation reads:
"Variables can contain `+` characters but in the unlikely
event that you want to have a variable name ending in plus, put a backslash
before the `+` so that the script knows you are not adding to an existing
variable but assigning to a new one::
maximum\+=value
"
However, '\' is also a legal character in a variable name (and
doubled backslashes or apostrophes etc. are legal, too), so
above line should actually set the environment variable "maximum\+"
to "value".
Best regards,
Wolfgang Denk
--
DENX Software Engineering GmbH, Managing Director: Wolfgang Denk
HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany
Phone: (+49)-8142-66989-10 Fax: (+49)-8142-66989-80 Email: w...@denx.de
Steal five dollars and you were a petty thief. Steal thousands of
dollars and you are either a government or a hero.
- Terry Pratchett, _Going_Postal_
