add missing kernel symbols to bootup Xtensa board via NFS

target/linux/config/Config.in.serial

@@ -1,15 +1,32 @@
 menu "Serial devices support"
 depends on ADK_TARGET_WITH_SERIAL || ADK_TARGET_QEMU || ADK_TARGET_VBOX
 
+config ADK_KERNEL_SERIAL_8250_CONSOLE
+	bool
+
+config ADK_KERNEL_SERIAL_OF_PLATFORM
+	bool
+
 config ADK_KERNEL_SERIAL_ETRAXFS_CONSOLE
 	bool
 
 config ADK_KERNEL_SERIAL_ETRAXFS
 	bool "ETRAXFS serial driver"
 	select ADK_KERNEL_SERIAL_ETRAXFS_CONSOLE
+	depends on ADK_TARGET_SYSTEM_QEMU_CRIS
 	default y if ADK_TARGET_SYSTEM_QEMU_CRIS
 	default n
 	help
 	  Serial driver for ETRAXFS CRISv32 Qemu Emulation.
 
+config ADK_KERNEL_SERIAL_8250
+	bool "8250 serial driver"
+	select ADK_KERNEL_SERIAL_OF_PLATFORM if ADK_TARGET_SYSTEM_XILINX_KINTEX7
+	select ADK_KERNEL_SERIAL_8250_CONSOLE
+	depends on ADK_TARGET_SYSTEM_XILINX_KINTEX7
+	default y if ADK_TARGET_SYSTEM_XILINX_KINTEX7
+	default n
+	help
+	  Serial driver for 8250 UART chip.
+
 endmenu

target/xtensa/kernel/xilinx-kintex7

@@ -1,5 +1,7 @@
 CONFIG_XTENSA=y
 CONFIG_XTENSA_PLATFORM_XTFPGA=y
-CONFIG_SERIAL_CONSOLE=y
-CONFIG_SERIAL_8250=y
-CONFIG_SERIAL_8250_CONSOLE=y
+CONFIG_XTENSA_VARIANT_DC233C=y
+CONFIG_XTENSA_UNALIGNED_USER=y
+CONFIG_USE_OF=y
+CONFIG_BUILTIN_DTB="kc705"
+

target/xtensa/systems/xilinx-kintex7

@@ -2,6 +2,7 @@ config ADK_TARGET_SYSTEM_XILINX_KINTEX7
 	bool "Xilinx Kintex 7"
 	select ADK_CPU_XTENSA
 	select ADK_TARGET_KERNEL_ZIMAGE
+	select ADK_TARGET_WITH_SERIAL
 	select ADK_HOST_BUILD_U_BOOT_GIT
 	help
 	 Support for Xilinx Kintex 7 with Cadence daughterboard.