The convention for overrides has always been for them to be
lower-case characters.
This practice is now a requirement as BitBake's datastore now
assumes lower-case characters in order to give a slight performance
boost during parsing.
In practical terms, this requirement means that anything that ends
up in
OVERRIDES
must now appear in lower-case characters (e.g. values for
MACHINE
, TARGET_ARCH
,
DISTRO
, and also recipe names if
_pn-
recipename
overrides are to be effective).