Step 5 : Test NuttX: Single Core with “Hello, World” program

  • In this program, you are going to learn

  • How to ?

Topics in this section,

  • Start QEMU (Single Core) with NuttX

$ qemu-system-aarch64 \
  -cpu cortex-a53 \
  -nographic \
  -machine virt,virtualization=on,gic-version=3 \
  -net none \
  -chardev stdio,id=con,mux=on \
  -serial chardev:con \
  -mon chardev=con,mode=readline \
  -kernel ./nuttx

  • QEMU shows this…

- Ready to Boot Primary CPU
- Boot from EL2
- Boot from EL1
- Boot to C runtime for OS Initialize

NuttShell (NSH) NuttX-12.5.0-RC0
nsh>
nsh>


Welcome to NuttX Land! You have entered the NuttX RTOS

  • Enter “help” or “?” to see the NuttX Commands:

nsh> help
help usage:  help [-v] [<cmd>]

    .           cp          exit        mkdir       rmdir       umount
    [           cmp         expr        mkrd        set         unset
    ?           dirname     false       mount       sleep       uptime
    alias       dd          fdinfo      mv          source      usleep
    unalias     df          free        pidof       test        xd
    basename    dmesg       help        printf      time
    break       echo        hexdump     ps          true
    cat         env         kill        pwd         truncate
    cd          exec        ls          rm          uname

    Builtin Apps:
    getprime    hello       nsh         ostest      sh

  • Enter the following command to be really sure that we’re emulating Arm64 :

nsh> uname -a
NuttX 12.5.0-RC0 446e0280b0 Apr  2 2024 18:22:30 arm64 qemu-armv8a

  • List the contents using same linux command “ls” as NuttX is POSIX Compliant :

nsh> ls
/:
 dev/
 proc/

  • Run “hello” to check whether hello program is running or not :

nsh> hello
Hello, World!!