After Grinch installed, `iwconfig` shows no wireless extension.

Wifi Card: Intel 7260
TK Release:21.5

ubuntu@tegra-ubuntu:/sys/class/gpio$ ls export gpio143 gpio191 gpiochip0 gpiochip1016 unexport

Hi codechaser,

You may need to post your issue in below link with clear Grinch version for other developers to help you:
https://devtalk.nvidia.com/default/topic/906018/jetson-tk1/-customkernel-the-grinch-21-3-4-for-jetson-tk1-developed/

Thanks

Hi,sir,is this kernel ok?
# R21 (release), REVISION: 5.0, GCID: 7273100, BOARD: ardbeg, EABI: hard, DATE: Wed Jun 8 04:19:09 UTC 2016

That’s the L4T version. R21.5 was a good release, but was deprecated and R21.6 is out…R21.6 mainly fixes bluetooth vulnerabilities so far as I know, and other parts of the release differences mostly do not exist. You can see kernel version with “uname -a” (the short numeric version with “uname -r”).

Below is the output of uname -a:
Linux tegra-ubuntu 3.10.40-grinch-21.3.4 #1 SMP PREEMPT Fri May 1 10:41:09 UTC 2015 armv7l armv7l armv7l GNU/Linux