Allow login on serial port

configs/raspi_defconfig

@@ -7,7 +7,7 @@ BR2_TOOLCHAIN_BUILDROOT_CXX=y
 BR2_TARGET_GENERIC_HOSTNAME="raspberrypi"
 BR2_TARGET_GENERIC_ISSUE="Welcome to the CamCorder"
 BR2_TARGET_GENERIC_ROOT_PASSWD="camcorder"
-BR2_TARGET_GENERIC_GETTY_PORT="tty1"
+BR2_TARGET_GENERIC_GETTY_PORT="ttyAMA0"
 BR2_SYSTEM_DHCP="eth0"
 BR2_ROOTFS_POST_IMAGE_SCRIPT="$(BR2_EXTERNAL)/board/raspi/post_image.sh"
 BR2_LINUX_KERNEL=y