riscv: use virtio by default

target/config/Config.in.qemuopts

@@ -28,8 +28,6 @@ config ADK_TARGET_QEMU_WITH_BLOCK
 
 menu "Qemu system configuration"
 depends on ADK_TARGET_QEMU && (ADK_TARGET_SYSTEM_QEMU_X86_64 \
-				|| ADK_TARGET_SYSTEM_QEMU_RISCV32 \
-				|| ADK_TARGET_SYSTEM_QEMU_RISCV64 \
 				|| ADK_TARGET_SYSTEM_QEMU_CSKY \
 				|| ADK_TARGET_SYSTEM_QEMU_X86 \
 				|| ADK_TARGET_SYSTEM_QEMU_ARC \

target/riscv32/Makefile

@@ -10,9 +10,7 @@ QEMU_ARGS:=-M virt -m 512 -nographic
 ifeq ($(ADK_TARGET_WITH_MMU),)
 QEMU_ARGS+=-bios none -cpu rv32,mmu=off
 endif
-ifeq ($(ADK_TARGET_QEMU_WITH_VIRTIO),y)
 QEMU_ARGS+=-netdev user,id=eth0 -device virtio-net-device,netdev=eth0
-endif
 ifeq ($(ADK_TARGET_FS),archive)
 QEMU_ARGS+=-device virtio-blk-device,drive=vda -drive file=qemu-${ADK_TARGET_CPU_ARCH}.img,if=none,id=vda,format=raw
 endif

target/riscv64/Makefile

@@ -10,10 +10,7 @@ QEMU_ARGS:=-M virt -m 512 -nographic
 ifeq ($(ADK_TARGET_WITH_MMU),)
 QEMU_ARGS+=-bios none -cpu rv64,mmu=off
 endif
-
-ifeq ($(ADK_TARGET_QEMU_WITH_VIRTIO),y)
 QEMU_ARGS+=-netdev user,id=eth0 -device virtio-net-device,netdev=eth0
-endif
 ifeq ($(ADK_TARGET_FS),archive)
 QEMU_ARGS+=-device virtio-blk-device,drive=vda -drive file=qemu-${ADK_TARGET_CPU_ARCH}.img,if=none,id=vda,format=raw
 endif