branch Attitude Adjustment

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+The image neede to flash onto a Broadcom 63xx-series board depends on the
+board, method you are using to flash, and, for web-based flash, on the version
+of the Broadcom code your router uses.
+
+There are two major revisions of the Broadcom code as far as imagetags are
+concerned, before 3.08 and after 3.08, however there are some variations 
+within in that, either due to vendor differences or due to changes at 
+Broadcom (it's not clear yet which is the case).  In addtion Pirelli modified
+the Broadcom code, so Alice Gate models use a different imagetag than any 
+other vendor.
+
+The imagetag format for flashing via CFE is the same for almost all the 
+boards, and is the same for all images generated by the imagetag utility.
+Images flashable using cfe are labelled openwrt-<board>-<filesystem>-cfe.bin
+
+The imagetags for tftp/ftp flashing is based on Broadcom 3.00-3.04 imagetags
+and is known to be correct as the source code GPL and is available for reading.
+
+Broadcom code 2.21 is based on the BT Voyager firmware image I looked at.  It
+may in fact be BT Voyager-specific.  2.21 is actually more difficult to deal
+with the imagetag from 3.00 as it has three different CRC calculations in
+addtition to the header CRC.
+
+Broadcom 3.00-3.02 flashing has been tested on Comtrend CT-5261, CT-536 and 
+Tecom GW6000, and is the version of the flashing that was present before the
+imagetags were split by broadcom code version (early June 2009)
+
+3.04 is guessed to be the same as 3.00-3.02 based on available information
+
+Broadom 3.06 is thought to be the same as 3.00-3.02, however the only 3.06 
+this author (Daniel Dickinson) has seen is the Alice Gate (Pirelli) firmware
+which is known to be different due to vendor (Pirelli) modifications to the
+Broadcom code.
+
+Broadcom 3.10 uses an imagetag that is believed to apply to all 3.10 and 3.12
+versions, and has been tested on the Tecom GW6200.  This version introdec changes to
+the imagetag to deal with TR69 (a remote rouer management system developed by the
+DSL forum).  There is a field for vendor-specific information, that at least in some
+cases is not optional.  It is based on the hexedit of a neufbox4 firmware image, the
+information in https://dev.openwrt.org/ticket/4987, and the hexedit of a Tecom
+GW6200 image.
+
+Some boards share the same tag format, but require vendor-specific fields in
+the board.  In that case the tagid is shared, but the filename of the generated
+image reflects the router for which the image was created.
+
+router        |method       | codever |filename
++-------------+-------------+---------+---------------------------------------
+|any          |cfe+most web |   any   |openwrt-<board>-<fs>-cfe.bin
+|AGVoIP2+WiFi |cfe          |alice3.06|openwrt-AGV2+W-cfe-<fs>-cfe.bin
+|AGVoIP2+WiFi |web          |alice3.06|openwrt-AGV2+W-cfe-<fs>-cfe.bin
+|CT536        |web          |3.02     |openwrt-CT536_CT5621-<fs>-cfe.bin
+|CT5621       |web          |3.02     |openwrt-CT536_CT5621-<fs>-cfe.bin
+|DG834GT      |web          |3.02     |openwrt-DG834GT_DG834PN-<fs>-cfe.bin
+|DG834PN      |web          |3.02     |openwrt-DG834GT_DG834PN-<fs>-cfe.bin
+|DSL-2640B    |web          |3.10     |openwrt-DSL2640B-<fs>-cfe.bin
+|DSL-2740B    |web          |3.10     |openwrt-DSL2670B-<fs>-cfe.bin
+|F5D7633      |web          |3.10     |openwrt-F5D7633-<fs>-cfe.bin
+|F@ST2404     |web          |3.0X?    |openwrt-F@ST2404-cfe-<fs>-cfe.bin
+|F@ST2404     |web          |3.1X?    |openwrt-F@ST2404-<fs>-cfe.bin
+|GW6000       |web          |3.00     |openwrt-GW6000-<fs>-cfe.bin
+|GW6200       |web          |3.10     |openwrt-GW6200-<fs>-cfe.bin
+|Neufbox4     |web          |3.12     |openwrt-NEUFBOX4-<fs>-cfe.bin
+|TD8810A      |web          |3.06     |openwrt-TD8810-<fs>-cfe.bin
+|TD8810B      |web          |3.06     |openwrt-TD8810-<fs>-cfe.bin
+|TD8811A      |web          |3.06     |openwrt-TD8811-<fs>-cfe.bin
+|TD8811B      |web          |3.06     |openwrt-TD881-<fs>-cfe.bin
+|TD8900GB     |web          |3.06     |openwrt-TD8900DB<fs>-cfe.bin
+|USR9108      |web          |3.0X?    |openwrt-USR9108-<fs>-cfe.bin
+|V2091_BTR    |web          |2.21     |openwrt-V2091_BTR-<fs>-cfe.bin
+|V2091_ROI    |web          |2.21     |openwrt-V2091-<fs>-cfe.bin
+|V2091_WB     |web          |2.21     |openwrt-V2091-<fs>-cfe.bin
+|V210_BTR     |web          |2.21     |openwrt-V210_BTR-<fs>-cfe.bin
+|V210_ROI     |web          |2.21     |openwrt-V210-ROI_WB<fs>-cfe.bin
+|V210_WB      |web          |2.21     |openwrt-V210-ROI_WB<fs>-cfe.bin
+|V2110        |web          |2.21     |openwrt-V2110-<fs>-cfe.bin
+|V2110_AA     |web          |2.21     |openwrt-V2110-<fs>-cfe.bin
+|V2110_ROI    |web          |2.21     |openwrt-V2110-<fs>-cfe.bin
+|V2500V       |web          |2.21     |openwrt-V2500V<fs>-cfe.bin
+|V2500V_AA    |web          |2.21     |openwrt-V2500V-<fs>-cfe.bin
+|V2500V_SIP_CLUB |web       |2.21     |openwrt-V2500V-<fs>-cfe.bin
+
+Old imagetag routers
+--------------------
+Davolink DV201AMR
+
+Redboot routers
+---------------
+Inventel Livebox
+
+Known router->code versions
+---------------------------
+
+Vendor                     |Model                                     |Code Ver
+---------------------------+------------------------------------------+--------
+Belkin                     |F5D7633                                   |3.10
+British Telecom (BT)       |Voyager V2091_BTR                         |2.21
+British Telecom (BT)       |Voyager V2091_ROI                         |2.21
+British Telecom (BT)       |Voyager V2091_WB                          |2.21
+British Telecom (BT)       |Voyager V210_BTR                          |2.21
+British Telecom (BT)       |Voyager V210_ROI                          |2.21
+British Telecom (BT)       |Voyager V210_WB                           |2.21
+British Telecom (BT)       |Voyager V2110                             |2.21
+British Telecom (BT)       |Voyager V2110_AA                          |2.21
+British Telecom (BT)       |Voyager V2110_ROI                         |2.21
+British Telecom (BT)       |Voyager V220V                             |2.21
+British Telecom (BT)       |Voyager V2500V                            |2.21
+British Telecom (BT)       |Voyager V2500V_AA                         |2.21
+British Telecom (BT)       |Voyager V2500V_SIP_CLUB                   |2.21
+Comtrend                   |CT-5261                                   |3.02
+Comtrend                   |CT-536                                    |3.02
+D-Link                     |DSL-2640B                                 |3.10
+D-Link                     |DSL-2670B                                 |3.10
+NetGear			   |DG834GT				      |3.02
+NetGear			   |DG834PN				      |3.02
+Neuf Cegetel               |Neufbox 4                                 |3.12
+Pirelli                    |Alice Gate Wi-Fi (+VoIP models?)          |ag 3.06
+Sagem			   |F@ST2404				      |?
+TP-Link                    |TD-8810A                                  |3.06
+TP-Link			   |TD-8810B				      |3.06
+TP-Link			   |TD-8811A				      |3.06
+TP-Link			   |TD-8811B				      |3.06
+TP-Link			   |TD-W8900GB				      |3.06
+Tecom                      |GW6000                                    |3.00
+Tecom                      |GW6200                                    |3.10
+USR			   |9108				      |?
+