BeagleBone

BeagleBone 

N.B. this attempt has failed - starting from the top in the next post.

I've shelved the Raspberry Pi until the USB webcam issues magically go away. I don't think I have the time or resources to look into these issues any further myself, and 320x240 is a very poor solution in 2012. 

Meanwhile I've ordered a BeagleBone from Farnell, and it has arrived today. Back to square one - get the camera working.

Installing Ubuntu

I used the "Install Ubuntu core system" instructions from

http://elinux.org/BeagleBoardUbuntu#Oneiric_11.10

see also;

http://fleshandmachines.wordpress.com/2012/05/03/beaglebone-on-ubuntu-11-04/

get the software;

sudo apt-get update
sudo apt-get install ffmpeg motion
sudo nano /etc/motion/motion.conf

changes to motion.conf for em28xx capture device;

input 1
ffmpeg_deinterlace on

webcam_localhost off



Testing with kworld usb2800 gives familiar looking green screen....
Testing with cx321xx (hauppage USB live 2) hangs motion on startup.
(this looks very much like the initial Raspberry Pi results... )

mending em28xx

Trying the linux.tv drivers first
http://git.linuxtv.org/media_build.git

need linux headers for BeagleBone first;

wget http://rcn-ee.net/deb/oneiric-armel/v3.2.21-psp16/linux-headers-3.2.21-psp16_1.0oneiric_armel.deb


dpkg -i linux-headers-3.2.21-psp16_1.0oneiric_armel.deb

didn't quite work

make[2]: Entering directory `/usr/src/linux-headers-3.2.0-psp7'

  CC [M]  /home/test/media_build/v4l/altera-lpt.o

In file included from include/linux/timex.h:174:0,

                 from include/linux/jiffies.h:8,

                 from include/linux/ktime.h:25,

                 from include/linux/timer.h:5,

                 from include/linux/workqueue.h:8,

                 from include/linux/pm.h:25,

                 from include/linux/device.h:24,

                 from include/linux/input.h:1136,

                 from /home/test/media_build/v4l/compat.h:9,

                 from <command-line>:0:

/usr/src/linux-headers-3.2.0-psp7/arch/arm/include/asm/timex.h:15:24: fatal error: mach/timex.h: No such file or directory

compilation terminated.

this looks useful here

https://groups.google.com/forum/?fromgroups#!topic/beagleboard/5xMAyFxQbdE

Getting full source

wget http://www.kernel.org/pub/linux/kernel/v3.0/linux-3.2.tar.bz2


(WRONG SOURCE? check http://www.kernel.org/pub/linux/kernel/v3.x/)


wget http://rcn-ee.net/deb/oneiric-armel/v3.2.21-psp16/defconfig


wget http://rcn-ee.net/deb/oneiric-armel/v3.2.21-psp16/patch-3.2-psp16.diff.gz


apply patch

zcat /home/test/patch-3.2-psp16.diff.gz | patch -p1
copy config

cp /home/test/defconfig .config

Looks like we are rebuilding the kernel then. The best of luck!

make



6hrs 50min later  It's finished, but with some error. 

OBJCOPY arch/arm/boot/Image
Kernel: arch/arm/boot/Image is ready
AS arch/arm/boot/compressed/head.o
LZMA arch/arm/boot/compressed/piggy.lzma
/bin/sh: lzma: not found
make[2]: *** [arch/arm/boot/compressed/piggy.lzma] Error 1
make[1]: *** [arch/arm/boot/compressed/vmlinux] Error 2
make: *** [zImage] Error 2

I hope lzma isn't important. (did apt-get install lzma but haven't re-maked yet)... moving on regardless.



make modules

make modules_install

*ABOUT HERE I REBUILT THE SD IMAGE USING QUANTAL - GOT THE SOURCE, BUT I DIDN'T MAKE IT. JUST DID make modules TO GET THE SYSVERS FILES.

no progress...

ah - symlink!... /lib/modules/linux-xxx/build was still pointing to headers, not to the source. [Stupid twat.]

./build wants make oldconfig and make prepare now, so I did that.

nearly there I think, media_build now fails with omap_vout. This doesn't sound like something I need - i'm going to just try disabling that.


 CC [M]  /home/test/media_build/v4l/omap_vout.o
/home/test/media_build/v4l/omap_vout.c: In function 'omapvid_setup_overlay':
/home/test/media_build/v4l/omap_vout.c:423:2: error: 'struct omap_overlay' has no member named 'is_enabled'
/home/test/media_build/v4l/omap_vout.c: In function 'omap_vout_release':
/home/test/media_build/v4l/omap_vout.c:952:7: error: 'struct omap_overlay' has no member named 'disable'
/home/test/media_build/v4l/omap_vout.c: In function 'vidioc_streamon':
/home/test/media_build/v4l/omap_vout.c:1695:13: error: 'struct omap_overlay' has no member named 'enable'
/home/test/media_build/v4l/omap_vout.c: In function 'vidioc_streamoff':
/home/test/media_build/v4l/omap_vout.c:1731:7: error: 'struct omap_overlay' has no member named 'disable'

cd media_build
menu menuconfig
-disabled all v4l platform devices
-trying again
make works this time.

make install


reboot

Oh, that hasn't worked.
According to lsmod no em28xx module is loaded... fatal errors when I try and modprobe the em28xx.ko files in media_build/v4l. Looks like an issue with my
source and the kernel?

I'm going to try and rebuild the kernel again, and actually use the image it makes - at least I will have break for a few hours.

This time I have lzma, but it can't allocate any memory.

 Kernel: arch/arm/boot/Image is ready
  AS      arch/arm/boot/compressed/head.o
  LZMA    arch/arm/boot/compressed/piggy.lzma
lzma: Cannot allocate memory
make[2]: *** [arch/arm/boot/compressed/piggy.lzma] Error 1
make[1]: *** [arch/arm/boot/compressed/vmlinux] Error 2
make: *** [zImage] Error 2


I suspect that would be because there physically isn't enough RAM... swapfile?

(Interesting it was a few hours quicker getting to this stage with the quantal armhf image)

from http://elinux.org/BeagleBoardUbuntu

sudo mkdir -p /var/cache/swap/   
sudo dd if=/dev/zero of=/var/cache/swap/swapfile bs=1M count=1024
sudo chmod 0600 /var/cache/swap/swapfile 
sudo mkswap /var/cache/swap/swapfile 
sudo swapon /var/cache/swap/swapfile 

it says add this line to /etc/fstab - i'm not sure i want a swapfile yet - i'll see how motion performs once it's working.

/var/cache/swap/swapfile    none    swap    sw    0   0

This compiles. No luck with the media_build driver this time... editing the driver in the kernel source gets me a flashing black/green screen... I'm going to stop and have a think. Something isn't right here. IR modded lifecam looks nice though...


After playing with Angstrom I've come back to this and tried removing motion and ffmpeg, and installing motion from source. Needed
sudo apt-get install libjpeg8 libjpeg8-dev
to work. (found the name of the jpeg packages here http://www.ozbotz.org/opencv-installation/ )Now I'm getting the seg faults on the lifecam at 720x576 (ok at 320x240).. but I am getting a picture out of the easycam em28xx devices.
Picture not useable - horizontal lines through it and colour problems. Suspect known USB DMA issues afoot?

looking at my .config confirms PIO not set https://groups.google.com/forum/?fromgroups#!topic/beagleboard/rBv2ZGSietM

CONFIG_MUSB_PIO_ONLY=y



Rebuilding the kernel again with this change in .config < and then trying again, by doing it via make menuconfig

used this to make kernel image;

cd /home/test/linux/linux-3.2/arch/arm/boot/

mkimage -A arm -O linux -T kernel -C none -a 0x80008000 -e 0x80008000 -n "Linux" -d zImage uImage 


mv /boot/uboot/uImage /boot/uboot/uImage.old


cp uImage /boot/uboot


reboot
modified from ( http://elinux.org/BeagleBoardUbuntu#BeagleBone and http://linux.die.net/man/1/mkimage)



Notes to self

DC input 2.1mm x 5.5mm
Uses two 46 pin dual row .1 x .1 female headers
this looks useful
http://elinux.org/BeagleBoardUbuntu#Motion


don't forget


apt-get install libncurses5-dev lzma make gcc patchutils libproc-processtable-perl