Re: had it working, now broken

[Bob Lockie]

On 02/20/03 07:03 Mark McClelland spoke thusly

Bob Lockie wrote:

I did something to break it (maybe installing a new kernel).

What's "it"? :-)

If I knew what "it" was I could fix it. :-)

2.4.20-ac2 kernel.

Did you run "make oldconfig" after copying your config into that kernel? Some config options may have changed.

No, I've never heard of that. :-)
I will investigate.

# insmod videodev
Using /lib/modules/2.4.20-ac2/kernel/drivers/media/video/videodev.o

# insmod ov511
Using /lib/modules/2.4.20-ac2/kernel/drivers/usb/ov511.o

# dmesg
Linux video capture interface: v1.00
usb.c: registered new driver ov511
ov511.c: USB OV511+ video device found
ov511.c: model: Creative Labs WebCam 3
ov511.c: Sensor is an OV7620
ov511.c: Device at usb-00:02.2-3 registered to minor 0
usb.c: ov511 driver claimed interface d7e351c0
ov511.c: v1.64 : ov511 USB Camera Driver

Looks OK so far, unless you were trying to insmod the driver from the current directory. You must include the ".o" extension, otherwise, insmod will load it from /lib/modules/ (as you can see above).

What version of the kernel do you use with the ov511-2.21 driver?

2.4.20, although I don't think there are any changes in 2.4.20-ac2 that would break it. It's possible though.

What happens when you try to compile/install/load/use it?

# more /proc/bus/usb/drivers
usbdevfs
hub
usb-storage
ov51

# ll /proc/bus/usb/devices
-r--r--r-- 1 root root 0 Feb 18 11:06 /proc/bus/usb/devices

I don't think that is supposed to be empty.

It always shows up that way (since it's not a "real" file). What happens when you try to cat it?

Wow, a whole bunch of stuff.
I didn't think of catting it since it is 0 bytes. :-)

# ll /proc/bus
total 0
-r--r--r--    1 root     root            0 Feb 18 16:23 i2c
dr-xr-xr-x    4 root     root            0 Feb 18 16:23 pci
dr-xr-xr-x    1 root     root            0 Feb 18 11:06 usb

The time for /proc/bus was not updated, shouldn't it be?

Nope. It only changes when usbdevfs is mounted/unmounted.

# ll /dev/video
lr-xr-xr-x 1 root root 11 Feb 18 11:05 /dev/video -> /dev/video0

# ll /dev/video0
crw-r--r-- 1 root sys 81, 0 Feb 18 11:05 /dev/video0

These have old dates too.

Unless you are using devfs (not to be confused with usbdevfs), that's normal. Apparently that file got created at bootup. It shouldn't matter either way though.

Very informative, thanks.

It now works, I wish I new what I changed.
I just kept doing stuff until it worked. :-)

One thing, I want to make /dev/v4l/video0 readable by all whenever it is created and change the group when it is created.


# ll /dev/v4l
total 0
crw------- 1 root root 81, 0 Dec 31 1969 video0




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