configs/qemu_xtensa_lx60_defconfig: switch to dc233c

dc232b is MMUv2 core, dc233c is very similar MMUv3 core. MMUv3 is the
latest full MMU for xtensa, which allows running both MMU and noMMU
linux variants.
Update configuration overlay and linux config file.

Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
Tested-by: Waldemar Brodkorb <wbx@openadk.org>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

board/qemu/xtensa-lx60/linux-4.4.config

@@ -1,8 +1,8 @@
 # CONFIG_SWAP is not set
 # CONFIG_CROSS_MEMORY_ATTACH is not set
 CONFIG_BLK_DEV_INITRD=y
-CONFIG_XTENSA_VARIANT_DC232B=y
-# CONFIG_INITIALIZE_XTENSA_MMU_INSIDE_VMLINUX is not set
+CONFIG_XTENSA_VARIANT_DC233C=y
+CONFIG_INITIALIZE_XTENSA_MMU_INSIDE_VMLINUX=y
 CONFIG_XTENSA_PLATFORM_XTFPGA=y
 CONFIG_CMDLINE_BOOL=y
 CONFIG_CMDLINE="console=ttyS0,38400"

board/qemu/xtensa-lx60/readme.txt

@@ -1,7 +1,7 @@
 Run the emulation with:
 
- qemu-system-xtensa -M lx60 -cpu dc232b -monitor null -nographic -kernel output/images/Image.elf
+ qemu-system-xtensa -M lx60 -cpu dc233c -monitor null -nographic -kernel output/images/Image.elf
 
 The login prompt will appear in the terminal that started Qemu.
 
-Tested with QEMU 2.3.0
+Tested with QEMU 2.5.0

configs/qemu_xtensa_lx60_defconfig

@@ -1,7 +1,7 @@
 # Architecture
 BR2_xtensa=y
 BR2_XTENSA_CUSTOM=y
-BR2_XTENSA_CUSTOM_NAME="dc232b"
+BR2_XTENSA_CUSTOM_NAME="dc233c"
 BR2_XTENSA_CORE_NAME="lx60"
 BR2_XTENSA_OVERLAY_DIR="board/qemu/xtensa-lx60"