Step 5 : Test NuttX: Single Core with "Hello, World" program
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   .. tab-item:: Test NuttX: Single Core with "Hello, World" program

        * In this program, you are going to learn


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                * How to ?


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        Topics in this section,

                * :ref:`Test NuttX: Single Core with "Hello, World" program <NuttX_qemu_ARM-Cortex-A5_step5_0>`


.. _NuttX_qemu_ARM-Cortex-A5_step5_0:

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   .. tab-item:: Test NuttX: Single Core with "Hello, World" program

        * Start QEMU (Single Core) with NuttX

        .. code-block:: c
            
                $ 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…

        .. code-block:: c

                - 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:

        .. code-block:: c

                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 :

        .. code-block:: c

                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 :

        .. code-block:: c

                nsh> ls
                /:
                 dev/
                 proc/


        * Run "hello" to check whether hello program is running or not :

        .. code-block:: c

                nsh> hello
                Hello, World!!
                




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