[LEDE-DEV] [OpenWrt-Devel] lantiq DSL drivers / firmware info

[Andrea Merello]

Hi,

I'm also hacking about Annex on my lantiq-based fritzbox 3370..

On Mon, Jul 10, 2017 at 10:40 PM, Mathias Kresin <dev at kresin.me> wrote:
> 10.07.2017 22:37, Mathias Kresin:
>>
>> 10.07.2017 22:07, Damian Kaczkowski:
>>>
>>> Hello Sylwester.
>>>
>>> On 10 July 2017 at 20:10, Sylwester Petela <sscapi at gmail.com> wrote:
>>>>
>>>> I used the following pictures for visualising and flowing the traces.
>>>> The pictures are in the gimp format and have multiple layers:
>>>>
>>>> TD-W8980 - Annex A:
>>>> https://www.dropbox.com/s/j6qoeoy1a479yrz/tp-link_w8980v1.xcf?dl=0
>>>> o2 Box 6431 - Annex B:
>>>> https://www.dropbox.com/s/jskzcnxvszdlraj/o2_6431.xcf?dl=0
>>>
>>>
>>> Your dropbox links does not work. Cloud you please look into this?
>>> Thanks in advance.
>>
>>
>> Most likely because these are links to my Dropbox. I'll send you a link
>> off-list. But I'm in doubt that it contains what you are looking for.
>>
>> With a lot of help from Sylwester I've modified the Hardware of an Annex A
>> board in a way that it syncs on an Annex B line.
>>
>> I had to change some bootstrap resistors to change the hybrid mode of the
>> VRX208. Afterwards I was able to load an Annex B firmware. Unfortunately it
>> was the last step I made.
>>
>> Prior I changed some more resistors, some caps and the line transformer to
>> match the components to what I found on Annex B boards. Not sure if it was
>> really necessary.

On my fb3370, I ended up in a similar HW hack about the bootstrap
resistors. This has been enough to load Annex A firmware, that
otherwise failed.

Also I own both a fb3370 DE-version (Annex B only) and afb3370
international edition (both Annex A and B officially supported) and I
can tell the two PCB are identical, the transformer are identical, and
all other components I've checked are identical. The international
edition's official firmware also runs fine on the DE-version board..

Possibly on other devices it's the same as for fb3370, and only
changing bootstrap pins is enough to make firmware load. Not sure if
devices that are designed for one Annex only will perform good also on
the other Annex..

>> I do not have a real clue what the AVM commands do. But it looks like they
>> are patching some (ram/register?) values of the VRX208. To my knowledge, the
>> VRX208 is an arc cpu and the xdsl firmware some kind of operating system.
>> But I could be wrong on this. There is literally no information about Lantiq
>> chips publicly available.

I agree..

>> I already had a look at some AVM GPL tarballs, but none of them had the
>> xdsl driver/daemon source code included. Would be to easy for us...
>>
>> Mathias
>
>
> The link to my "annex_switch" Dropbox folder:
> https://www.dropbox.com/sh/hfir1pk5vvo6b29/AADcArCIJumnS7MLV6TiCD4Ba?dl=0.
>
> Mathias