Found out, the problem that "dd" was not getting any data was due BeagleBoneBlack usb dma configuration on kernel: config_musb_pio_only This should be true to Disable DMA (always use PIO). Now I can debug if the problem is the saa711x driver version. 2014-11-03 10:03 GMT-02:00 Rafael Coutinho <rafael.coutinho@xxxxxxxxxxxxxxxxxx>: > I have tried now with a newer kernel (3.14) and I can't even get an > stream from /dev/video0. The file is always empty. > > Here is the dmesg of it: > http://pastebin.com/pm720UnR > > It is correctly identifying the device, however it cannot grab any > bytes from the dd command as below: > dd if=/dev/video0 of=ImageOut.raw bs=10065748 count=1 > > Any tips on how to investigate it further? > > 2014-10-29 18:13 GMT-02:00 Rafael Coutinho <rafael.coutinho@xxxxxxxxxxxxxxxxxx>: >> Ok, just to be sure, I have others capture boards like Silan SC8113, >> that's only on newer kernels? If so I'll backport it. >> >> 2014-10-29 17:08 GMT-02:00 Mauro Carvalho Chehab <m.chehab@xxxxxxxxxxx>: >>> Em Wed, 29 Oct 2014 16:34:09 -0200 >>> Rafael Coutinho <rafael.coutinho@xxxxxxxxxxxxxxxxxx> escreveu: >>> >>>> Hi all, >>>> >>>> I'm having trouble to make an SAA7115 (Actually it's the generic >>>> GM7113 version) video capture board to work on a beagle board running >>>> Android (4.0.3). >>>> For some reason I cannot capture any image, it always output a green image file. >>>> The kernel is Linux-3.2.0 >>> >>> Support for GM7113 were added only on a recent version. >>> >>> So, you need to get a newer driver. So, you'll need to either upgrade >>> the Kernel, use either Linux backports or media-build to get a newer >>> driver set or do the manual work of backporting saa7115 and the bridge >>> driver changes for gm7113 for it to work. >>> >>> Regards, >>> Mauro >>> >>>> >>>> My current approach is the simplest I have found so far, to avoid any >>>> issues with other sw layers. I'm forcing a 'dd' from the /dev/video >>>> device. >>>> >>>> dd if=/dev/video0 of=ImageOut.raw bs=10065748 count=1 >>>> >>>> And then I open the raw image file converting it on an image editor. >>>> >>>> In my ubuntu PC (kernel 3.13.0) it works fine. however on the Beagle >>>> Bone with android it fails to get an image. >>>> >>>> I have now tried with a Linux (angstron) on beagle bone with 3.8 >>>> kernel and this time is even worse, the 'dd' command does not result >>>> on any byte written on the output file. >>>> >>>> The v4l2-ctl works fine on the 3 environments. I can even set values >>>> as standard, input etc... >>>> >>>> I have attached the dmesg of the environments here: >>>> >>>> * Android - dmesg http://pastebin.com/AFdB9N9c >>>> >>>> * Linux Angstron - dmesg http://pastebin.com/s3S3iCph >>>> * Linux Angstron - lsmod http://pastebin.com/vh89TBKQ >>>> >>>> * Desktop PC - dmesg http://pastebin.com/HXzHwnUJ >>>> >>>> I have one restriction on the kernel of android due the HAL drivers >>>> for BBB. So changing kernel is not a choice. >>>> >>>> Anyone could give me some tips on where to look for other issues or debug it? >>>> >>>> Thanks in advance >>>> >> >> >> >> -- >> Regards, >> Coutinho >> www.phiinnovations.com > > > > -- > Regards, > Coutinho > www.phiinnovations.com -- Regards, Coutinho www.phiinnovations.com -- To unsubscribe from this list: send the line "unsubscribe linux-media" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
