Re: Zoran Linux driver 64-bit support

Hallo

> finally I managed to come up with a patch for 64-bit support current
> Linux kernel versions. In order to implement the PCI bus APIs I had to
> rewrite the most of the JPEG buffer allocation. While doing that I
> noticed a potential security issue in the handler for the mmap syscall,
> which might allow an attacker with access to the v4l device to get
> access to protected memory areas.
So is that more or less a updated patch for the problem you fixed 2 
years ago ? At that time for kernel 2.6.24

> The attached patches enable 64-bit support and fix the issue for kernels
> 2.6.32 and 2.6.38+ (tested on Debian Linux but should apply for most
I did download the 2.6.38.7 linux kernel from kernel.org and built it.
The patch did apply without any problems.

But I have problems getting the driver working. I do not get a 
/dev/video0 device. The DC-30 is detected in some way but refuses to 
work. I hope that you can give me a hint how to accomplish that.

I did load the modules manually:
zr36067                76446  0
zr36050                 8055  0
zr36016                 4775  0
videocodec              6286  3 zr36067,zr36050,zr36016
adv7175                 4573  0
vpx3220                 7271  0
v4l2_common            11391  3 zr36067,adv7175,vpx3220
videodev               75998  4 zr36067,adv7175,vpx3220,v4l2_common
i2c_dev                 7823  0
i2c_algo_bit            5641  2 zr36067,radeon

But when loading the zr36067 modules I find that in /var/log/messages
[ 2576.120748] Linux video capture interface: v2.00
[ 2635.218934] Linux video codec intermediate layer: v0.2
[ 2650.926927] Zoran MJPEG board driver version 0.10.0
[ 2650.928071] MJPEG[0]: Zoran ZR36067 (rev 2), irq: 21, memory: 0xfdcfe000
[ 2650.928079] MJPEG[0]: Subsystem vendor=0x1031 id=0xd801
[ 2650.930238] DC30plus[0]: SCL unexpected low while pulling SDA low!
[ 2650.930267] DC30plus[0]: zoran_probe - can't initialize i2c bus

xawtv fail afterwards as expected:
 > xawtv
This is xawtv-3.95, running on Linux/x86_64 (2.6.38.7-0.5-desktop)
xinerama 0: 1600x1200+0+0
can't open /dev/video0: No such file or directory
v4l-conf had some trouble, trying to continue anyway
v4l2: open /dev/video0: No such file or directory
v4l: open /dev/video0: No such file or directory
no video grabber device available


Do you have any idea what kind of problem I run into ?
I can also put the Iomega Buz into the computer and to a test run.

> other kernel flavors as well). We should try to get that in mainline if
> possible.
That is right.

> The next task is now to update the lavrec tool to use the V4L2
> interface for setting up the card, because I couldn't test on 2.6.38
> yet. Or does anyone know an alternative tool to capture the JPEG frames
> on Linux?
I don't know of any other tool to record from a zoran based car. A patch 
for lavrec would be really great.

auf hoffentlich bald,

Berni the Chaos of Woodquarter

Email: [email protected]
www: http://www.lysator.liu.se/~gz/bernhard

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