1. Download and install toolchain
$ curl https://static.dev.sifive.com/dev-tools/riscv64-unknown-elf-gcc-8.3.0-2019.08.0-x86_64-linux-ubuntu14.tar.gz
2. Build and install qemu
$ git clone https://github.com/qemu/qemu
$ cd qemu
$ ./configure --target-list=riscv32-softmmu,riscv64-softmmu
$ make
$ sudo make install
3.1. Configure and build NuttX for BUILD_FLAT
$ mkdir ./nuttx; cd ./nuttx
$ git clone https://github.com/apache/incubator-nuttx.git nuttx
$ git clone https://github.com/apache/incubator-nuttx-apps.git apps
$ cd nuttx
$ make distclean
$ ./tools/configure.sh rv-virt:nsh
$ make V=1 -j7
3.2 Configure and build NuttX for BUILD_KERNEL
$ mkdir ./nuttx; cd ./nuttx
$ git clone https://github.com/apache/incubator-nuttx.git nuttx
$ git clone https://github.com/apache/incubator-nuttx-apps.git apps
$ cd nuttx
$ make distclean
$ ./tools/configure.sh rv-virt:knsh64
$ make V=1 -j7
$ make export V=1
$ cd ../apps
$ ./tools/mkimport.sh -z -x ../nuttx/nuttx-export-*.tar.gz
$ make import V=1
$ cd ../nuttx
4. Run the nuttx with qemu
$ qemu-system-riscv32 -semihosting -M virt,aclint=on -cpu rv32 -smp 8 -bios none -kernel nuttx -nographic
or
$ qemu-system-riscv64 -semihosting -M virt,aclint=on -cpu rv64 -smp 8 -bios none -kernel nuttx -nographic
NuttShell (NSH) NuttX-10.3.0-RC1
nsh> mount -t hostfs -o fs=. /host
nsh> cat /host/AUTHORS
This is a list of all the contributors that have submitted ICLA, SGA
If you are not on this list and believe you should be, please inform us.
ICLA
====
...
nsh>
5. TODO
Support FPU
Support RISC-V User mode
Support Network
