[linux-dvb] Reverse enginnering using i2c protocol analysers

[linux-dvb] Reverse enginnering using i2c protocol analysers

[Robin Perkins]

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Does anyone have any experiences using i2c logic analysers to work out  
how cards work ?

Is it an effective reverse enginering method ?

I was looking for them online but most of them seem pretty expensive (~ 
$4000) however I found the Total Phase Beagle for about $300. Has  
anyone else tried this adapter out ? (It appears to have software for  
Linux, OS X and Windows which seems pretty good.)

Thanks,

Rob

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Re: [linux-dvb] Reverse enginnering using i2c protocol analysers

[Steven Toth]

Robin Perkins wrote:
> Does anyone have any experiences using i2c logic analysers to work out 
> how cards work ? 
> 
> Is it an effective reverse enginering method ? 
> 
> I was looking for them online but most of them seem pretty expensive 
> (~$4000) however I found the Total Phase Beagle 
> <http://www.totalphase.com/products/beagle_ism/> for about $300. Has 
> anyone else tried this adapter out ? (It appears to have software for 
> Linux, OS X and Windows which seems pretty good.)

A parallel port on a spare linux box, two wires and a copy of lmilk does 
it for me. < $10.

- Steve

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Re: [linux-dvb] Reverse enginnering using i2c protocol analysers

[Markus Rechberger]

2008/8/23 Robin Perkins <robin.perkins@internode.on.net>:
> Does anyone have any experiences using i2c logic analysers to work out how
> cards work ?
> Is it an effective reverse enginering method ?

not everything is usually bound to i2c..

there are Virtualization methods available nowadays for PCI
passthrough (Intel has one, AMD I'm not sure about the status). As
soon as that is mainstream it will make reverse engineering easier..
Another interesting thing would be drivers could directly be used out
from a operating system which is jailed in a virtual machine.

Qemu has support for PCI passthrough with appropriate patches,
although the host will get killed as soon as DMA gets set up.

USB can easily be captured with usbsnoop.

Markus

> I was looking for them online but most of them seem pretty expensive
> (~$4000) however I found the Total Phase Beagle for about $300. Has anyone
> else tried this adapter out ? (It appears to have software for Linux, OS X
> and Windows which seems pretty good.)
> Thanks,
> Rob
> _______________________________________________
> linux-dvb mailing list
> linux-dvb@linuxtv.org
> http://www.linuxtv.org/cgi-bin/mailman/listinfo/linux-dvb
>

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Re: [linux-dvb] Reverse enginnering using i2c protocol analysers

[Steven Toth]

Steven Toth wrote:
> Robin Perkins wrote:
>> Does anyone have any experiences using i2c logic analysers to work out 
>> how cards work ?
>> Is it an effective reverse enginering method ?
>> I was looking for them online but most of them seem pretty expensive 
>> (~$4000) however I found the Total Phase Beagle 
>> <http://www.totalphase.com/products/beagle_ism/> for about $300. Has 
>> anyone else tried this adapter out ? (It appears to have software for 
>> Linux, OS X and Windows which seems pretty good.)
> 
> A parallel port on a spare linux box, two wires and a copy of lmilk does 
> it for me. < $10.

Just for the record, it won't go above 100KHz so while it works on 
almost everything I've ever used it on ... at somepoint of someone wants 
to run their i2c bus at > 100Khz, this won't work.

- Steve

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Re: [linux-dvb] Reverse enginnering using i2c protocol analysers

[e9hack]

Steven Toth schrieb:
> Robin Perkins wrote:
>> Does anyone have any experiences using i2c logic analysers to work out 
>> how cards work ? 
>>
>> Is it an effective reverse enginering method ? 
>>
>> I was looking for them online but most of them seem pretty expensive 
>> (~$4000) however I found the Total Phase Beagle 
>> <http://www.totalphase.com/products/beagle_ism/> for about $300. Has 
>> anyone else tried this adapter out ? (It appears to have software for 
>> Linux, OS X and Windows which seems pretty good.)
> 
> A parallel port on a spare linux box, two wires and a copy of lmilk does 
> it for me. < $10.

I wasn't able to get lmilk to work. I've build my own cheep i2c-monitor 
(http://www.vdr-portal.de/board/thread.php?postid=639818#post639818). It can record i2c 
transmissions with a peak rate of 250kHz. The overall speed is limited by the serial 
interface with a rate of 1.5MBaud. It isn't necessary to use a second PC to monitor a 
windows driver.

- Hartmut

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