--- zzzz-none-000/linux-3.10.107/arch/arm/configs/rpc_defconfig	2017-06-27 09:49:32.000000000 +0000
+++ scorpion-7490-727/linux-3.10.107/arch/arm/configs/rpc_defconfig	2021-02-04 17:41:59.000000000 +0000
@@ -131,3 +131,4 @@
 CONFIG_DEBUG_USER=y
 CONFIG_DEBUG_ERRORS=y
 CONFIG_DEBUG_LL=y
+CONFIG_DEBUG_LL_UART_8250=y