I've been trying to install a mythtv backend in centos 5.2 under Xen, with PCI passthrough of a DVB-T tuner to the domU. In theory I should just need to use the centosplus kernel to get the additional video capture drivers. In practice I've got two problems, the first of which I think is easy to solve. Once I got the PCI device visible in the domU, I could load the saa7134 driver for the analogue section of the card, but I couldn't load the saa7134_dvb driver for the digital section of the card, this driver is missing from the centosplus kernel. I've installed the kernel source, and modified the .config file as shown in the patch below (the extra SAA7134_DVB settings are what my card requires, but I figure there are potentially users of the BT848_DVB driver that might appreciate that being included too). After re-building the relevant modules, copying them to /lib/modules and doing "depmod -a" I can load the saa7134_dvb module. I saw another user who experienced the same issue with centos 5.1 and Johnny Hughes said he would be willing to enable extra modules if they would help. http://lists.centos.org/pipermail/centos/2007-December/091890.html Could the relevant .config files for centosplus kernels be patched as follows? --- .config.pre 2008-06-29 00:41:18.000000000 +0100 +++ .config.post 2008-06-29 01:33:04.000000000 +0100 @@ -1,7 +1,7 @@ # # Automatically generated make config: don't edit # Linux kernel version: 2.6.18-prep -# Sun Jun 29 00:41:10 2008 +# Sun Jun 29 01:33:04 2008 # CONFIG_X86_64=y CONFIG_64BIT=y @@ -2035,7 +2035,7 @@ # CONFIG_VIDEO_ADV_DEBUG is not set CONFIG_VIDEO_VIVI=m CONFIG_VIDEO_BT848=m -# CONFIG_VIDEO_BT848_DVB is not set +CONFIG_VIDEO_BT848_DVB=y CONFIG_VIDEO_SAA6588=m CONFIG_VIDEO_BWQCAM=m CONFIG_VIDEO_CQCAM=m @@ -2057,7 +2057,8 @@ CONFIG_VIDEO_ZORAN_AVS6EYES=m CONFIG_VIDEO_SAA7134=m CONFIG_VIDEO_SAA7134_ALSA=m -# CONFIG_VIDEO_SAA7134_DVB is not set +CONFIG_VIDEO_SAA7134_DVB=m +CONFIG_VIDEO_SAA7134_DVB_ALL_FRONTENDS=y CONFIG_VIDEO_MXB=m CONFIG_VIDEO_DPC=m CONFIG_VIDEO_HEXIUM_ORION=m My second problem is a bit harder, or possibly a sign that I've not configured xen pciback/pcifront properly. When the saa7134 driver is loaded in the domU, I see the following messages in dmesg saa7130/34: v4l2 driver version 0.2.14 loaded saa7130: found at 0000:00:00.0, rev: 1, irq: 17, latency: 64, mmio: 0xfebffc00 saa7130: subsystem: 185b:c901, board: Compro Videomate DVB-T200 [card=71,autodetected] saa7130: can't ioremap() MMIO memory saa7134: probe of 0000:00:00.0 failed with error -5 I'm not sure if the saa7134 driver is unusual in trying to perform an ioremap which is causing the error? dev->lmmio = ioremap(pci_resource_start(pci_dev,0), 0x1000); Any suggestions on that one?