how to pass option to the module at boot with the kernel cmdline

make kernel_menuconfig
Kernel hacking --->(rootfstype=squashfs,jffs2) Default kernel command string
rootfstype=squashfs,jffs2 usbserial.vendor=0x0123 usbserial.product=0x0123
kernel_menuconfig > Kernel hacking > Default kernel command string

does not work for me.

cat /proc/cmdline shows:
board=CARAMBOLA console=ttyS1,115200 rootfstype=squashfs,jffs2 usbserial.vendor=0x099e usbserial.product=0x0002
but the module have not the rigth option.

setenv bootargs in uboot and saveenv

Hello, we are trying to figure out how to use both ethernet ports as actual switch.