Thank you for the quick reply,
in our machin confif only SERIAL_CONSOLE is set, it is:
> 
> SERIAL_CONSOLE = "115200 ttyO0"

But yocto then uses that to set SERIAL_CONSOLES

In bitbake -e I see SERIAL_CONSOLE and SERIAL_CONSOLES set to :

> 
> # $SERIAL_CONSOLE [3 operations]
> #   set
> /home/wdurocher/work/gammaip/warrior/sources/meta-gammaip/conf/machine/gammaip.conf:16
> 
> #     "115200 ttyO0"
> #   set
> /home/wdurocher/work/gammaip/warrior/sources/meta/meta/conf/documentation.conf:371
> 
> #     [doc] "The speed and device for the serial port used to attach the
> serial console. This variable is given to the kernel as the 'console'
> parameter. After booting occurs, getty is started on that port so remote
> login is possible."
> #   set
> /home/wdurocher/work/gammaip/warrior/sources/meta/meta/conf/bitbake.conf:845
> 
> #     [_defaultval] ""
> # pre-expansion value:
> #   "115200 ttyO0"
> SERIAL_CONSOLE="115200 ttyO0"
> #
> # $SERIAL_CONSOLES [2 operations]
> #   set
> /home/wdurocher/work/gammaip/warrior/sources/meta/meta/conf/documentation.conf:372
> 
> #     [doc] "Defines the serial consoles (TTYs) to enable using getty."
> #   set
> /home/wdurocher/work/gammaip/warrior/sources/meta/meta/conf/bitbake.conf:846
> 
> #     [_defaultval] "${@d.getVar('SERIAL_CONSOLE').replace(' ', ';')}"
> # pre-expansion value:
> #   "${@d.getVar('SERIAL_CONSOLE').replace(' ', ';')}"
> SERIAL_CONSOLES="115200;ttyO0"
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