Index keys need to support case-insensitive compares

[flit]

The keys for Cache.index should be all lower-case so that devices can be found with a case-insensitive match.

[theotherjimmy]

This is a good idea.

[theotherjimmy]

@jkrech Are Dnames and Dvariants required to be unique after lowercasing? Could making all devices names lower case lead to conflicts of legitimate devices down the line?

[jkrech]

CMSIS-Pack is case sensitive and all we are prescribing in the specification is that each Dvendor is responsible for the uniqueness of the Dname / Dvariant descriptions distributed by their own packs. This shall ensure that the touple Dvendor:Dname is unique. Therefore in theory lower-casing Dname may result in duplicates. I have not seen that yet but as far as I can see we must not rule it out completely.

[theotherjimmy]

Thanks. That's helpful. @flit We may have to find another way to search case-insensitively. I also need to have Dvendor in the index as well.

[flit]

Ok, well, I've already implemented case-insensitivity in pyOCD, anyway.

More generally, I agree the DFP attributes must be case-sensitive. Those contain device vendor names or part numbers.

But from a usability perspective in pyOCD, making target type names case-insensitive is a must.