riscv: Add QEMU virt board support
This adds QEMU RISC-V 'virt' board target support, with the hope of
helping people easily test U-Boot on RISC-V.
The QEMU virt machine models a generic RISC-V virtual machine with
support for the VirtIO standard networking and block storage devices.
It has CLINT, PLIC, 16550A UART devices in addition to VirtIO and
it also uses device-tree to pass configuration information to guest
software. It implements RISC-V privileged architecture spec v1.10.
Both 32-bit and 64-bit builds are supported. Support is pretty much
preliminary, only booting to U-Boot shell with the UART driver on
a single core. Booting Linux is not supported yet.
Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Lukas Auer <lukas.auer@aisec.fraunhofer.de>
diff --git a/configs/qemu-riscv32_defconfig b/configs/qemu-riscv32_defconfig
new file mode 100644
index 0000000..ff1fb1f
--- /dev/null
+++ b/configs/qemu-riscv32_defconfig
@@ -0,0 +1,6 @@
+CONFIG_RISCV=y
+CONFIG_TARGET_QEMU_VIRT=y
+CONFIG_NR_DRAM_BANKS=1
+CONFIG_DISPLAY_CPUINFO=y
+CONFIG_DISPLAY_BOARDINFO=y
+CONFIG_OF_BOARD=y