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Boot time driver conflict

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Old 09-08-2010
Boot time driver conflict
I have a Microdia web cam. Some times it won't work if and only if there is a "HV7131R image sensor detected" statement in the boot up.
In this case when I try to get a .png snapshot all I get is a frame full of what appears to be white noise only it is mostly green.
Here is the command I am using:
TV="-tv driver=v4l2:device=/dev/video${vd}:width=320:height=240:norm=NTSC:chanlist=us-cable:input=0:noaudioSmilieutfmt=i420"
OUT="-fps 30 -cache 128"
PIC="-hue 0 -brightness 0 -contrast 0 -saturation 0 -aspect 4:3"
mplayer tv:// $TV $OUT $PIC -vf screenshot -vo xv,x11,
This does not work when ${vd} is 0 or 1 and it is using HV7131R.
If it is not using HV7131R it works properly.
I think I am getting either gspca or HV7131R usage defined at boot time. Is there a way to force either one so I can test?
Hope it is OK here as the problem occurs in my script.
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LEARN ABOUT DEBIAN

mkimage

MKIMAGE(1)						      General Commands Manual							MKIMAGE(1)

NAME

       mkimage - Generate image for U-Boot

SYNOPSIS

       mkimage [options]

DESCRIPTION

       The  mkimage  command is used to create images for use with the U-Boot boot loader.  These images can contain the linux kernel, device tree
       blob, root file system image, firmware images etc., either separate or combined.

       mkimage supports two different formats:

       The old legacy image format concatenates the individual parts (for example, kernel image, device tree blob and ramdisk image) and adds a 64
       bytes  header containing information about target architecture, operating system, image type, compression method, entry points, time stamp,
       checksums, etc.

       The new FIT (Flattened Image Tree) format allows for more flexibility in handling images of various types and also enhances integrity  pro-
       tection of images with stronger checksums.

OPTIONS

       List image information:

       -l [uimage file name]
	      mkimage lists the information contained in the header of an existing U-Boot image.

       Create old legacy image:

       -A [architecture]
	      Set architecture. Pass -h as the architecture to see the list of supported architectures.

       -O [os]
	      Set operating system. bootm command of u-boot changes boot method by os type.  Pass -h as the OS to see the list of supported OS.

       -T [image type]
	      Set image type.  Pass -h as the image to see the list of supported image type.

       -C [compression type]
	      Set compression type.  Pass -h as the compression to see the list of supported compression type.

       -a [load addess]
	      Set load address with a hex number.

       -e [entry point]
	      Set entry point with a hex number.

       -n [image name]
	      Set image name to 'image name'.

       -d [image data file]
	      Use image data from 'image data file'.

       -x     Set XIP (execute in place) flag.

       Create FIT image:

       -D [dtc options]
	      Provide special options to the device tree compiler that is used to create the image.

       -f [image tree source file]
	      Image tree source file that describes the structure and contents of the FIT image.

EXAMPLES

       List image information:
       mkimage -l uImage

       Create legacy image with compressed PowerPC Linux kernel:
       mkimage -A powerpc -O linux -T kernel -C gzip 
       -a 0 -e 0 -n Linux -d vmlinux.gz uImage

       Create FIT image with compressed PowerPC Linux kernel:
       mkimage -f kernel.its kernel.itb

HOMEPAGE

       http://www.denx.de/wiki/U-Boot/WebHome

AUTHOR

       This manual page was written by Nobuhiro Iwamatsu <iwamatsu@nigauri.org> and Wolfgang Denk <wd@denx.de>

								    2010-05-16								MKIMAGE(1)