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The prefix was recently changed to play ball with the CVE-2021-27138 workaround in U-Boot. Already deployed bootloaders though may still expect a configuration name containing @ or they may not be affected by this issue. Also, uses may want to customize it beyond the [@-] issue: When device trees are built from a recipe using kernel-devicetree.bbclass the configuration nodes will contain the parent directories, e.g. KERNEL_DEVICETREE = "freescale/imx8mm-myboard.dtb" will become "conf-freescale_imx8mm-myboard.dtb". When moving to devicetree.bbclass, this prefix go away. With this change here, users can restore it easily by setting FIT_CONF_PREFIX = "conf-freescale_", ensuring backwards compatibility. (From OE-Core rev: 7892ee3dc37d302c8eb9c13cd8bb4b7b6e103949) Signed-off-by: Ahmad Fatoum <a.fatoum@pengutronix.de> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>