1*4882a593SmuzhiyunBR2_arm=y 2*4882a593SmuzhiyunBR2_cortex_m4=y 3*4882a593SmuzhiyunBR2_TOOLCHAIN_EXTERNAL=y 4*4882a593SmuzhiyunBR2_TOOLCHAIN_EXTERNAL_BOOTLIN_ARMV7M_UCLIBC_STABLE=y 5