RISC-V Build Infrastructure

This adds RISC-V into the build system enabling the following targets:

- riscv32-softmmu
- riscv64-softmmu
- riscv32-linux-user
- riscv64-linux-user

This adds defaults configs for RISC-V, enables the build for the RISC-V
CPU core, hardware, and Linux User Emulation. The 'qemu-binfmt-conf.sh'
script is updated to add the RISC-V ELF magic.

Expected checkpatch errors for consistency reasons:

ERROR: line over 90 characters
FILE: scripts/qemu-binfmt-conf.sh

Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Sagar Karandikar <sagark@eecs.berkeley.edu>
Signed-off-by: Michael Clark <mjc@sifive.com>

1 files changed, 4 insertions, 0 deletions

diff --git a/default-configs/riscv32-softmmu.mak b/default-configs/riscv32-softmmu.mak
new file mode 100644
index 0000000000..f9e742120c
--- /dev/null
+++ b/default-configs/riscv32-softmmu.mak
@@ -0,0 +1,4 @@
+# Default configuration for riscv-softmmu
+
+CONFIG_SERIAL=y
+CONFIG_VIRTIO=y