Since there's no ISI driverfor linux, I'm trying to enable USB webcam support on my ARM board. A part from kernel default supported cameras (that are old models), I would like to install any recent driver, such as Gspca.
How can I cross-compile Gspca (or other USB camera driver) and load module on my ARM linux?
Did anyone tryied something similar?

Thanks in advance

Matteo Pucci

I did it. Just use a cross-compiler such as arm-2008q1; first of all edit Makefile, substituting
KDIR := /lib/modules/$(shell uname -r)/build
with
KDIR := /9263kernel/linux-2.6.24/
or wherever you got ARM linux sources.
Then launch:
make CROSS_COMPILE=/arm-2008q1/bin/arm-none-linux-gnueabi- ARCH=arm KERNELSRC=/9263kernel/linux-2.6.24/ CC=/arm-2008q1/bin/arm-none-linux-gnueabi-gcc
Changing path /arm-2008q1/ with your cross-compiler one. Once compilation finished, copy *.ko on arm target (in /lib/modules/2.6.24/kernel/drivers/media/video/), run depmod and modprobe your module.
It worked for me, modules was loaded and device recognized.
Unfortunately when I try to read from it (cat /dev/video0) or open with an application (such as camsource), I get an error:

Unable to handle kernel NULL pointer dereference at virtual address 0000009d
pgd = c3fec000
[0000009d] *pgd=23e6d031, *pte=00000000, *ppte=00000000
Internal error: Oops: 1 [#1]
......

Does anyone knows the cause (and hopefully the solution)?

If anyone has tried, does it works correctly any USB camera directly supported by linux kernel drivers (such as Cpia, Cpia2, ov511, ...)? It would be useful to know that there's no segmentation fault in this case.

i have use ov511 & spca5xx (support ZC301 web cam), but i didn't meet the error u encountered. i think maybe ur kernel configuration about v4l and mutlimedia is not correct.and then cause the kernel haven't the v4l programming interface to user space.

The problem was v4l API 1 (deprecated) that has to disabled.
Now it works great, especially with my cross-compiled ffmpeg
Thanks and hope this helps someone