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Certain TI K3 devices such as AM62x and AM62Ax require a Device Manager (DM) firmnware to be made available to the U-Boot build, which will get packaged into the "tispl.bin" image tree blob during A53 SPL build. Without that DM firmware U-Boot will not be functional. To support this, add a config option called BR2_TARGET_UBOOT_NEEDS_TI_K3_DM to enable this feature, and another option BR2_TARGET_UBOOT_TI_K3_DM_SOC to allow setting the name of the SOC which needs to match the corresponding folder name in the ti-linux-firmware Git repository. Signed-off-by: Andreas Dannenberg <dannenberg@ti.com> Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>