Hi Chris, On 08/22/2011 11:41 AM, Laurent Pinchart wrote: > > Hi Chris, > > On Monday 22 August 2011 06:12:41 CJ wrote: >> On 19/08/11 22:12, Laurent Pinchart wrote: >>>> I am trying to get the mt9p031 working from nand with a ubifs file >>>> system and I am having a few problems. >>>> >>>> /dev/media0 is not present unless I run: >>>> #mknod /dev/media0 c 251 0 >>>> #chown root:video /dev/media0 >>>> >>>> #media-ctl -p >>>> Enumerating entities >>>> media_open: Unable to enumerate entities for device /dev/media0 >>>> (Inappropriate ioctl for device) >>>> >>>> With the same rig/files it works fine running from EXT4 on an SD card. >>>> Any idea why this does not work on nand with ubifs? >>> >>> Is the OMAP3 ISP driver loaded ? Has it probed the device successfully ? >>> Check the kernel log for OMAP3 ISP-related messages. >> >> Here is the version running from SD card: >> # dmesg | grep isp >> [ 0.265502] omap-iommu omap-iommu.0: isp registered >> [ 2.986541] omap3isp omap3isp: Revision 2.0 found >> [ 2.991577] omap-iommu omap-iommu.0: isp: version 1.1 >> [ 2.997406] omap3isp omap3isp: hist: DMA channel = 0 >> [ 3.006256] omap3isp omap3isp: isp_set_xclk(): cam_xclka set to >> 21600000 Hz >> [ 3.011932] omap3isp omap3isp: isp_set_xclk(): cam_xclka set to 0 Hz >> >> From NAND using UBIFS: >> # dmesg | grep isp >> [ 3.457061] omap3isp omap3isp: Revision 2.0 found >> [ 3.462036] omap-iommu omap-iommu.0: isp: version 1.1 >> [ 3.467620] omap3isp omap3isp: hist: DMA channel = 0 >> [ 3.472564] omap3isp omap3isp: isp_set_xclk(): cam_xclka set to >> 21600000 Hz >> [ 3.478027] omap3isp omap3isp: isp_set_xclk(): cam_xclka set to 0 Hz >> >> Seems to be missing: >> omap-iommu omap-iommu.0: isp registered >> >> Is that the issue? Why would this not work when running from NAND? I'm not sure, either, but I had a similar problem before using Laurent's patch below. IIRC, usually udev would create /dev/media0 from a cached list of /dev/*. Later modutils would come along and load the modules in the proper order (iommu, then omap3-isp) and everybody was happy. Occasionally, udev would fail to use the cached version of /dev/, and look through /sys/devices to re-create the devices in /dev/. When media0 was found, omap3-isp.ko would be loaded, but iommu had not yet been, presumably because it doesn't have an entry in /sys/devices/. So maybe udev is behaving differently for you on NAND than it did on the card? Either way, as I said, using Laurent's patch below did the job for me. -Michael > > I'm not sure why it doesn't work from NAND, but the iommu2 module needs to be > loaded before the omap3-isp module. Alternatively you can compile the iommu2 > module in the kernel with > > diff --git a/arch/arm/plat-omap/Kconfig b/arch/arm/plat-omap/Kconfig > index 49a4c75..3c87644 100644 > --- a/arch/arm/plat-omap/Kconfig > +++ b/arch/arm/plat-omap/Kconfig > @@ -132,7 +132,7 @@ config OMAP_MBOX_KFIFO_SIZE > module parameter). > > config OMAP_IOMMU > - tristate > + bool > > config OMAP_IOMMU_DEBUG > tristate "Export OMAP IOMMU internals in DebugFS" > MATRIX VISION GmbH, Talstrasse 16, DE-71570 Oppenweiler Registergericht: Amtsgericht Stuttgart, HRB 271090 Geschaeftsfuehrer: Gerhard Thullner, Werner Armingeon, Uwe Furtner, Erhard Meier -- 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
