--- zzzz-none-000/linux-3.10.107/arch/arm/configs/iop33x_defconfig	2017-06-27 09:49:32.000000000 +0000
+++ scorpion-7490-727/linux-3.10.107/arch/arm/configs/iop33x_defconfig	2021-02-04 17:41:59.000000000 +0000
@@ -87,5 +87,6 @@
 # CONFIG_RCU_CPU_STALL_DETECTOR is not set
 CONFIG_DEBUG_USER=y
 CONFIG_DEBUG_LL=y
+CONFIG_DEBUG_LL_UART_8250=y
 # CONFIG_CRYPTO_ANSI_CPRNG is not set
 # CONFIG_CRC32 is not set