[OpenWrt-Devel] [PATCH 2/2] lantiq: get rid of ltq-vdsl-fw

[John Crispin]

On 19/12/2015 09:14, Andre Heider wrote:
> Hi again,
> 
> On Fri, Dec 11, 2015 at 11:50 AM, John Crispin <blogic at openwrt.org> wrote:
>> had a chat with hauke. the bdiff between the A and B FW is around 64K.
>> the idea would be to patch dsl_control to have a mechanism similar to
>> the dsl_notify script. dsl_control would call the script once before fw
>> loading with the "prepare" parameter and once the FW is loaded it will
>> call the script again with the "delete" parameter.
>>
>> the script will then make sure to copy/patch the fw to /tmp on prepare
>> and remove it again on delete. this would allow storing both files in
>> the lzma area of the flash and we could runtime patch the FW on demand.
>>
>> volunteers to welcome ;)
> 
> I could look into that I guess.

cool
> 
> Which would mean we need a host tool to create a binary patch and a
> target tool to apply it.
> Is such a tool already used anywhere in openwrt?
> 

http://www.daemonology.net/bsdiff/ and its not used yet. packaging a new
tool is trivial however. just have a look at tools/*/Makefile


> But it'll mean that a patched fw in /tmp would use an additional ~1mb memory.

dsl_control would call the script twice. once when it want the fw to be
prepared and a second time when it is finished which will trigger the
deletion of the fw from /tmp

	John

> 
> Regards,
> Andre
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