DESK-MX9-L/Development/Hello World example
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| 2024/01/30 | DESK-MX9-L-5.0.0 release | ||
Hello word example[edit | edit source]
Here below is an example on C code displaying the classic Hello World! message on the target serial console.
This example shows how to use the arm cross-compiler using the environment configured for this purpose.
Setting the cross-compiler[edit | edit source]
- start the Linux development VM and login into the system
- open a terminal window and cd into your source code directory
dvdk@vagrant:~$ mkdir myproject
dvdk@vagrant:~$ cd myproject/
dvdk@vagrant:~/myproject$ vi hello.c
dvdk@vagrant:~/myproject$ cat hello.c
#include <stdio.h>
int main(){
printf("Hello, World!\n");
return 0;
}
- configure the build environment
dvdk@vagrant:~/myproject$ source /home/dvdk/desk-mx-l/desk-mx9-l-5.0.0_env.sh
- as you can see here below, the
$CCenvironment variable has been properly configured for using the SDKsysrootparameter:
dvdk@vagrant:~/myproject$ echo $CC aarch64-poky-linux-gcc -march=armv8-a+crc+crypto -mbranch-protection=standard -fstack-protector-strong -O2 -D_FORTIFY_SOURCE=2 -Wformat -Wformat-security -Werror=format-security --sysroot=/opt/yocto/sdk/desk-mx9-l/desk-mx9-l-5.0.0/sysroots/armv8a-poky-linux dvdk@vagrant:~/myproject$
- invoke the cross-compiler for compiling your source code example: the object file obtained, is a proper ELF 64-bit for the target microprocessor
dvdk@vagrant:~/myproject$ $CC hello.c -o hello dvdk@vagrant:~/myproject$ file hello hello: ELF 64-bit LSB shared object, ARM aarch64, version 1 (SYSV), dynamically linked, interpreter /lib/ld-linux-aarch64.so.1, BuildID[sha1]=c64beb8181cc5a2fe6290f8b61b217a25041b429, for GNU/Linux 3.14.0, with debug_info, not stripped dvdk@vagrant:~/myproject$
Running the example on the target[edit | edit source]
Now it is enough to copy the object file in the /home/root rfs directory and boot from nfs:
dvdk@vagrant:~/myproject$ sudo cp hello /home/dvdk/desk-mx-l/rfs/desk-mx9-l/home/root/ dvdk@vagrant:~/myproject$ sudo ls -la /home/dvdk/desk-mx-l/rfs/desk-mx9-l/home/root/ total 32 drwx------ 3 root root 4096 Jan 31 10:46 . drwxr-xr-x 4 root root 4096 Mar 9 2018 .. -rwxr-xr-x 1 root root 75624 Jan 31 10:46 hello -rw-r--r-- 1 root root 1011 Mar 9 2018 .profile dvdk@vagrant:~/myproject$
on the target:
...
[ OK ] Mounted /run/media/root-mmcblk1p2.
[ OK ] Started Weston, a Wayland …mpositor, as a system service.
[ OK ] Reached target Graphical Interface.
Starting Record Runlevel Change in UTMP...
[ OK ] Finished Record Runlevel Change in UTMP.
NXP i.MX Release Distro 6.1-mickledore desk-mx93 ttyLP0
desk-mx93 login: root
root@desk-mx93:~# ls -la
total 32
drwx------ 3 root root 4096 Jan 31 2024 .
drwxr-xr-x 4 root root 4096 Mar 9 2018 ..
-rw-r--r-- 1 root root 1011 Mar 9 2018 .profile
-rwxr-xr-x 1 root root 75624 Jan 31 2024 hello
root@desk-mx93:~# ./hello
Hello, World!
root@desk-mx93:~#
