openwrtv4/target/linux/brcm63xx/image
John Crispin 01ca7a34f0 brcm63xx/lzma-loader: fix O32 ABI conformance
According to the calling convention of the o32 ABI the caller
function must reserve stack space for $a0-$a3 registers in case
the callee needs to save its arguments.

The assembly code of the loader does not reserve stack space for
these registers thus when the 'loader_main' function needs to save
its arguments, those will be stored in the 'workspace' area instead
of the stack.

Because the workspace area is also used by other part of the code, the
saved register values gets overwritten and this often leads to failed
kernel boots.

Fix the code to reserve stack space for the registers to avoid this
error.

Signed-off-by: Gabor Juhos <juhosg@openwrt.org>
[noltari: apply the fix for brcm63xx too]
Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>

SVN-Revision: 48979
2016-03-10 19:10:54 +00:00
..
lzma-loader brcm63xx/lzma-loader: fix O32 ABI conformance 2016-03-10 19:10:54 +00:00
Makefile brcm63xx: add support for Huawei HG622 2016-01-18 10:47:23 +00:00
README.images-bcm63xx flashmap and image generation: reduced union bcm_tag to a single struct combining the elements so that it is no longer necessary to create an openwrt-only tagid and tagcrc, and elimate the tagid detection and switch statements which made dealing with imagetags overly complicated, especially since the logic would need analogs in all code that touched the imagetag. Patch from cshore. 2010-04-01 21:20:43 +00:00

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				      |?