Trying to extend 'adtimg' functionality [1], we've been severely hit
by a major limitation in the command's usage scheme. Specifically, the
command's user interface appears to be too centric to getting the
DTB/DTBO entry [3] based on the index of the desired DT in the image,
which makes it really difficult retrieving the DT entry based on
alternative criteria (e.g. filtering by id/rev fields), the
latter being demanded by real life customer use-cases [1].
This went to the point of receiving below feedback from Sam [2]:
-- snip --
As for 'dtimg' command: after giving it some thought, I think not much
people using it yet. So in this particular case I don't have some
strong preference, and if you think the 'dtimg' interface is ugly, and
it overcomes "don't break interfaces" rule, maybe now is a good time
to rework it (before it gets widely used).
-- snip --
Given the above, rework the usage pattern from [4] to [5], in order to
allow an intuitive enablement of "by id|rev" DT search [6].
[1] https://patchwork.ozlabs.org/cover/1202575/
("cmd: dtimg: Enhance with --id and --rev options (take #1)")
[2] https://patchwork.ozlabs.org/patch/1182207/#2317020
[3] https://source.android.com/devices/architecture/dto/partitions
[4] Old usage
adtimg dump <addr> - Print image contents
adtimg start <addr> <index> <varname> - Get DT address by index
adtimg size <addr> <index> <varname> - Get DT size by index
[5] New usage
adtimg addr <addr> - Set image location to <addr>
adtimg dump - Print out image contents
adtimg get dt --index=<i> [avar [svar]] - Get DT address and size by index
[6] Soon-to-be-provided "by id|rev" add-on functionality
adtimg get dt --id=<id> --rev=<rev> [avar [svar [ivar]]]
- Get DT address/size/index by id|rev fields
Signed-off-by: Eugeniu Rosca <erosca@de.adit-jv.com>
Reviewed-by: Sam Protsenko <semen.protsenko@linaro.org>
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