[user@local-FR-LE01 builddir]$ MACHINE=ted-zynqmp bitbake-getvar MACHINE
NOTE: Starting bitbake server...
#
# $MACHINE [2 operations]
#   set /home/user/yocto_pretest_kirckstone/builddir/conf/local.conf:28
#     [_defaultval] "ted-fake"
#   set /home/user/yocto_pretest_kirckstone/builddir/../externals/core/meta/conf/documentation.conf:277
#     [doc] "Specifies the target device for which the image is built. You define MACHINE in the conf/local.conf file in the Build Directory."
# pre-expansion value:
#   "ted-fake"
MACHINE="ted-fake"
[user@local-FR-LE01 builddir]$ grep MACHINE conf/local.conf
MACHINE ??= "ted-fake"
[user@local-FR-LE01 builddir]$