Hi Brian,

I fixed my problem yesterday, thank you for your answer.

The problem was the URL on the file firmware-imx.inc, i took this new file : http://git.yoctoproject.org/cgit/cgit.cgi/meta-freescale/tree/recipes-bsp/firmware-imx/firmware-imx.inc?h=pyro

Also, there was an other problem with the file "firmware-imx_5.4.bb" . I took the new file : http://git.yoctoproject.org/cgit/cgit.cgi/meta-freescale/tree/recipes-bsp/firmware-imx/firmware-imx_5.4.bb?h=morty
And i removed the line 3. 
Before it was : require recipes-bsp/firmware-imx/firmware-imx.inc
And now, i put : require firmware-imx.inc

Finally it works!

Thank you for your help, all of you.

See you soon, i hope.

Best regards