Need help compiling v4l2loopback kernel module

[TeHashX]

I build uvc modules using this tutorial https://www.hqt.ro/how-to-compile-modules-for-asuswrt-routers/ but now I need v4l2loopback.ko with kernel headers 2.6.36.4brcmarm from https://github.com/umlaeute/v4l2loopback
Can I add to "make menuconfig" or just simply compile?
Thanks

 

[RMerlin]

Kernel options are stored in config_base.6a within the kernel tree.

 

[Fitz Mutch]

How to apply the patch for Linux kernel 2.6.36.4. Then compile the Asuswrt-Merlin firmware. The new kernel module, v4l2loopback.ko, will be compiled into the Asuswrt-Merlin firmware.

Assuming you've already got the projects:

cd
git clone https://github.com/umlaeute/v4l2loopback.git
git clone https://github.com/RMerl/asuswrt-merlin.git

Patch to fix up all three Asuswrt ARM kernels in one shot:

cd ~/asuswrt-merlin
patch -p2 -i ~/asuswrt-arm-v4l2loopback.patch

Create symbolic links in Asuswrt-Merlin to the source files in v4l2loopback project:

PACKAGEDIR="~/v4l2loopback"
MERLINDIR="~/asuswrt-merlin"
cd $MERLINDIR
for KERNELDIR in "src-rt-6.x.4708" "src-rt-7.14.114.x/src" "src-rt-7.x.main/src"; do
  ln -sf $PACKAGEDIR/v4l2loopback.c $MERLINDIR/release/$KERNELDIR/linux/linux-2.6.36/drivers/media/video/v4l2loopback.c
  ln -sf $PACKAGEDIR/v4l2loopback_formats.h $MERLINDIR/release/$KERNELDIR/linux/linux-2.6.36/drivers/media/video/v4l2loopback_formats.h
done

 

[TeHashX]

Thank you very much for detailed guide, I compiled successfully but didn't tried v4l2loopback functionality.
How about if I just want to compile without integrate in firmware?
make -C ~/asuswrt-merlin/release/src-rt-6.x.4708/linux/linux-2.6.36 modules_install

Sent from my HTC 10 using Tapatalk

 

[Fitz Mutch]

I compiled successfully but didn't tried v4l2loopback functionality.

Use 7-Zip to open the .trx file and extract the new kernel modules. They are located here:

\lib\modules\2.6.36.4brcmarm\kernel\drivers\media

How about if I just want to compile without integrate in firmware?

Not sure how to compile only the kernel modules. I think you'd at least need to change your PATH variable to use the cross-compilation toolchain?

[ ! -h /opt/brcm ] && sudo ln -sf ~/asuswrt-merlin/tools/brcm /opt/brcm
[ ! -h /opt/brcm-arm ] && sudo ln -sf ~/asuswrt-merlin/release/src-rt-6.x.4708/toolchains/hndtools-arm-linux-2.6.36-uclibc-4.5.3 /opt/brcm-arm
export PATH=/opt/brcm-arm/bin:/opt/brcm-arm/arm-brcm-linux-uclibcgnueabi/bin:/opt/brcm/hndtools-mipsel-linux/bin:/opt/brcm/hndtools-mipsel-uclibc/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin

 

[kvic]

If Asus/Broadcom care to look into and patch the WiFi bug, extracting the new WiFi drivers from Asus trx image will be my shortcut to patch the firmware on my RT-AC56U. lol

But since you already have compile the firmware locally, you can save the hassle of extracting trx and then its squashfs image. Assume Fitz's relative path is correct, simply can get the kernel driver from your disk at:

router/arm-uclibc/target/lib/modules/2.6.36.4brcmarm/kernel/drivers/media

How about if I just want to compile without integrate in firmware?

make kernel

That will speed up your compile time.

If you mean independently build kernel modules, it's very difficult if possible. You need the firmware's source three to build kernel modules that'll work...in a given kernel. That's lot easier.