UCODE_SIGNATURE  7559 drivers/gpu/drm/amd/include/atombios.h #define   UCODE_SIGNATURE         0x4375434d // 'MCuC' - MC uCode
UCODE_SIGNATURE  6369 drivers/gpu/drm/radeon/atombios.h #define	UCODE_SIGNATURE			0x4375434d // 'MCuC' - MC uCode