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