Makefile/Build errors on Raspberry Pi 2

[sjobeek]

Hey there,

When testing this out on my new Raspberry Pi 2, I ran into a couple bumps with the makefile:

1) Had to modify the makefile to match $UNAME to armv7l

ifeq ($(UNAME),armv6l)
---------->
ifeq ($(UNAME),armv7l)

2) to build libreconnect I had to change one variable in one line of gspca.c which seemed to be referencing an undefined variable: (same as issue #14)

V4L2_FL_USE_FH_PRIO
---->
V4L2_FL_USES_V4L2_FH

A google search for the undefined variable turned up the solution which worked: http://sourceforge.net/p/adi-buildroot/bugs/263/

After those changes, I was able to make and load the libraries on my Raspberry Pi 2 and got depth output. Great!

It wasn't clear to me how to "install" the modules permanently in the kernel since make install didn't seem to exist.

[silvio-didonna]

Thank you, working fine.

[tophstar]

Hey there,

Thanks for finding these solutions. I am able to make now, but my make load is failing. Are these the errors you were talking about? If so, I don't seem to have a /dev/video0 after the make load.

root@raspberrypi:/home/pi/bucket/librekinect# make
make pc
make[1]: Entering directory '/home/pi/bucket/librekinect'
make -C /lib/modules/3.18.16-v7/build M=/home/pi/bucket/librekinect modules
make[2]: Entering directory '/usr/src/linux'
  Building modules, stage 2.
  MODPOST 2 modules
make[2]: Leaving directory '/usr/src/linux'
make[1]: Leaving directory '/home/pi/bucket/librekinect'

root@raspberrypi:/home/pi/bucket/librekinect# make load
make unload_drivers
make[1]: Entering directory '/home/pi/bucket/librekinect'
sudo sh unload_drivers.sh
Error: Module gspca_main is not currently loaded
Error: Module gspca_kinect is not currently loaded
Error: Module gspca is not currently loaded
Error: Module kinect is not currently loaded
make[1]: Leaving directory '/home/pi/bucket/librekinect'
sudo modprobe videodev
sudo insmod gspca.ko
sudo insmod kinect.ko
sudo chown -f -R root:root /dev/video* 
Makefile:42: recipe for target 'load' failed
make: *** [load] Error 1

[tophstar]

Figured it out... the kinect needed to be plugged in for make load to work.

[LukeShu]

If you have Linux 3.17 or above, this has already been merged into the mainline kernel (https://github.com/torvalds/linux/commit/c87c0f079cf8c9c346adbedd367ba53ad0afaded); toggle the 'kinect' module's depth_mode flag to toggle between this depth mode and the older video mode.

Oh, look 3.17 is also when V4L2_FL_USE_FH_PRIO was removed. That is: you don't need to build this.

Regarding the low-levels of V4L2_FL_USE_FH_PRIO: In https://github.com/torvalds/linux/commit/95cd5d5ee67c2108765ae87d34761d54fd6671ce it was removed outright. See the commit message for justification.