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157 lines
4.8 KiB
157 lines
4.8 KiB
.. SPDX-License-Identifier: GPL-2.0 |
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================================== |
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How to get the bt8xx cards working |
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================================== |
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Authors: |
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Richard Walker, |
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Jamie Honan, |
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Michael Hunold, |
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Manu Abraham, |
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Uwe Bugla, |
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Michael Krufky |
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General information |
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------------------- |
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This class of cards has a bt878a as the PCI interface, and require the bttv |
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driver for accessing the i2c bus and the gpio pins of the bt8xx chipset. |
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Please see Documentation/admin-guide/media/bttv-cardlist.rst for a complete |
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list of Cards based on the Conexant Bt8xx PCI bridge supported by the |
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Linux Kernel. |
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In order to be able to compile the kernel, some config options should be |
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enabled:: |
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./scripts/config -e PCI |
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./scripts/config -e INPUT |
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./scripts/config -m I2C |
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./scripts/config -m MEDIA_SUPPORT |
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./scripts/config -e MEDIA_PCI_SUPPORT |
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./scripts/config -e MEDIA_ANALOG_TV_SUPPORT |
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./scripts/config -e MEDIA_DIGITAL_TV_SUPPORT |
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./scripts/config -e MEDIA_RADIO_SUPPORT |
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./scripts/config -e RC_CORE |
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./scripts/config -m VIDEO_BT848 |
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./scripts/config -m DVB_BT8XX |
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If you want to automatically support all possible variants of the Bt8xx |
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cards, you should also do:: |
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./scripts/config -e MEDIA_SUBDRV_AUTOSELECT |
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.. note:: |
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Please use the following options with care as deselection of drivers which |
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are in fact necessary may result in DVB devices that cannot be tuned due |
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to lack of driver support. |
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If your goal is to just support an specific board, you may, instead, |
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disable MEDIA_SUBDRV_AUTOSELECT and manually select the frontend drivers |
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required by your board. With that, you can save some RAM. |
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You can do that by calling make xconfig/qconfig/menuconfig and look at |
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the options on those menu options (only enabled if |
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``Autoselect ancillary drivers`` is disabled: |
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#) ``Device drivers`` => ``Multimedia support`` => ``Customize TV tuners`` |
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#) ``Device drivers`` => ``Multimedia support`` => ``Customize DVB frontends`` |
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Then, on each of the above menu, please select your card-specific |
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frontend and tuner modules. |
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Loading Modules |
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--------------- |
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Regular case: If the bttv driver detects a bt8xx-based DVB card, all |
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frontend and backend modules will be loaded automatically. |
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Exceptions are: |
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- Old TV cards without EEPROMs, sharing a common PCI subsystem ID; |
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- Old TwinHan DST cards or clones with or without CA slot and not |
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containing an Eeprom. |
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In the following cases overriding the PCI type detection for bttv and |
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for dvb-bt8xx drivers by passing modprobe parameters may be necessary. |
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Running TwinHan and Clones |
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~~~~~~~~~~~~~~~~~~~~~~~~~~ |
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As shown at Documentation/admin-guide/media/bttv-cardlist.rst, TwinHan and |
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clones use ``card=113`` modprobe parameter. So, in order to properly |
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detect it for devices without EEPROM, you should use:: |
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$ modprobe bttv card=113 |
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$ modprobe dst |
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Useful parameters for verbosity level and debugging the dst module:: |
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verbose=0: messages are disabled |
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1: only error messages are displayed |
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2: notifications are displayed |
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3: other useful messages are displayed |
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4: debug setting |
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dst_addons=0: card is a free to air (FTA) card only |
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0x20: card has a conditional access slot for scrambled channels |
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dst_algo=0: (default) Software tuning algorithm |
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1: Hardware tuning algorithm |
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The autodetected values are determined by the cards' "response string". |
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In your logs see f. ex.: dst_get_device_id: Recognize [DSTMCI]. |
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For bug reports please send in a complete log with verbose=4 activated. |
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Please also see Documentation/admin-guide/media/ci.rst. |
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Running multiple cards |
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~~~~~~~~~~~~~~~~~~~~~~ |
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See Documentation/admin-guide/media/bttv-cardlist.rst for a complete list of |
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Card ID. Some examples: |
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=========================== === |
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Brand name ID |
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=========================== === |
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Pinnacle PCTV Sat 94 |
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Nebula Electronics Digi TV 104 |
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pcHDTV HD-2000 TV 112 |
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Twinhan DST and clones 113 |
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Avermedia AverTV DVB-T 77: 123 |
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Avermedia AverTV DVB-T 761 124 |
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DViCO FusionHDTV DVB-T Lite 128 |
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DViCO FusionHDTV 5 Lite 135 |
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=========================== === |
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.. note:: |
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When you have multiple cards, the order of the card ID should |
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match the order where they're detected by the system. Please notice |
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that removing/inserting other PCI cards may change the detection |
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order. |
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Example:: |
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$ modprobe bttv card=113 card=135 |
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In case of further problems please subscribe and send questions to |
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the mailing list: [email protected]. |
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Probing the cards with broken PCI subsystem ID |
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ |
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There are some TwinHan cards whose EEPROM has become corrupted for some |
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reason. The cards do not have a correct PCI subsystem ID. |
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Still, it is possible to force probing the cards with:: |
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$ echo 109e 0878 $subvendor $subdevice > \ |
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/sys/bus/pci/drivers/bt878/new_id |
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The two numbers there are:: |
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109e: PCI_VENDOR_ID_BROOKTREE |
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0878: PCI_DEVICE_ID_BROOKTREE_878
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