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Sniffing the Rigol's internal I2C bus

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salvix:

--- Quote from: houly on August 17, 2014, 09:44:57 am ---Hello all,
I'm plainning to buy a MSO4000 series wand i would want to know if the hack could work on it (in order to choose the 100 MHz and hope hack it to have more bandwidth)
is it possible ? and how ?

regards

--- End quote ---

Yes. Install MrKrabs firmware from http://gotroot.ca/rigol/.

Gandalf_Sr:
@0xPIT

I'm having exactly the same issues you described in your reply #3478. 

I'm trying to dump the memory from my MSO2072A using Ubuntu on a Dell Netbook, it always finishes with 'Reply contains invalid hex digit 116'

For us non-Linux literate folks, would you mind expanding on where to find the log file and the exact lines for using the AWK instructions?

Thanks

[Edit] My latest attempt finished as 0xPIT said, again with the 116 error and then I closed the terminal but I can't find the tmp/log file on the drive anywhere.  Any idea where it's supposed to be or how I can find it?

[Edit2] I am thinking of getting a different USB-JTAG debugger.  The Olimex vn seems expensive at $70 given the chip is <$3, any suggestions for a good FT2232-based programmer that is supported by urJTAG?

0xPIT:
@Gandalr_Sr

I described the procedure in my post.

You need to specify the location of the log file in gdb using e.g.
    set remotelogfile /tmp/log
 it will save the log to the file named "log" in the folder /tmp.

Then you need to clean the log file.
First, you want only lines received, which start with "+r $"
   awk '/+r\ $/' /tmp/log > /tmp/filtered.log

Second, we strip all the "+r $"
   cat /tmp/filtered.log | sed 's/^+r\ $//' > /tmp/cleaned.log

then use convert to binary using
   xxd -p -r /tmp/cleaned.log /tmp/dump.bin

If in doubt, consult the man pages (man <command>) or google for it.
Be aware that I'm on the road, you need to double-check escaping of the commands I suggested.

Gandalf_Sr:
@0xPIT

Thanks for the clarifications, I'm now pretty sure that the reason I've failed so far to dump successfully from my MSO2072A is that the cheap $7 'Altera' USB Blaster from eBay only supports a frequency of 12 MHz, (gdb) tell me that after I execute the command that's supposed to set the frequency.

Now I'm waiting for the Sparkfun FT2232-based device to arrive.

xd1217:

--- Quote from: PepeK on August 12, 2014, 09:40:47 am ---As the latest DS / MSO 2072 having SW 3.0 SP1 and HW 2.2 refuses patched firmware gel file ver 2, what about modifying the gel file to pretend it is ver 3 ?
Is there something like header / data structure in the first block of the gel file which defines version ?
I am asking because if I open any (2.0 or 3.0) gel file in hex editor, there is a version string at the beginning.

--- End quote ---

Did you sort it out??

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