bdinfo may also have -a, -e and -m options depending on some symbols
being set. Document all this and provide an example on how to use them
and what they typically output.

Signed-off-by: Quentin Schulz <quentin.schulz@cherry.de>

The devicetree, current eth and IP addr info are only available when
certain symbols are defined, so let's make the dependencies explicit.

Signed-off-by: Quentin Schulz <quentin.schulz@cherry.de>
Reviewed-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>

For nearly all commands in U-Boot the '?' variable is handled the same
way with 0 meaning success, 1 meaning any failure.  Explain this in the
general rules section of the cmdline documentation (with a link to a
counter example) and then remove the redundant wording from most
commands. We retain a section about the return value in a number of
places where we are doing something such as always returning a specific
value or we have useful additional information to go along with the
normal return codes.

Signed-off-by: Tom Rini <trini@konsulko.com>
Reviewed-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>

Add the description of CLI commands to the generated index.

Signed-off-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>

Move the useful help to Kconfig.

Drop mention of CONFIG_SYS_MALLOC_SIMPLE since it doesn't exist.

Correct a 'CONFIGSYS_MALLOC_F_LEN' typo

Signed-off-by: Simon Glass <sjg@chromium.org>

The 'Example' heading should be on a lower level than 'bdinfo command'.

Signed-off-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
Reviewed-by: Simon Glass <sjg@chromium.org>

Provide a man-page for the bdinfo command

Signed-off-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
Reviewed-by: Simon Glass <sjg@chromium.org>