Jeson TX1 has no wifi interface

Hi everybody,
From this instruction
I build kernel for Jetson TX1 using tegra21_defconfig, but after finish booting using this kernel image and I check network configuration by ‘ifconfig’ there is no wlan interface.
Are there anyone has same problem? Or someone can give me suggestion to enable wlan interface?

Thank in advance.
Best regards.

This is my mistake, because I did not install new kernel image and modules to root file system.
I solve this by following instruction

Thank for your attention.