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Sniffing the Rigol's internal I2C bus

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Crille77:

--- Quote from: McBryce on July 30, 2015, 08:10:55 pm ---Nice pics.

If you had used the "speed 6000" command (increases connection speed to 6Mhz) before doing the savebin it would have sped the process up considerably. The entire dump takes about 7 or 8 minutes at 6Mhz.

McBryce.

--- End quote ---
Thanks!

I used openocd and that doesn't recognize speed for the USBBlaster... I tried every command related to speed without any luck... Maybe it would work with the "genuine" USBBlaster and not the cheep ebay version that I got.

McBryce:
Not sure about that. I used a Segger with the J-Link software.

McBryce.

Fluxx1122:
Hey Guys,

nice work ;)

since I saw Crille77s post, I remembered I got a genuine USB-Blaster myself. I thought I would give it a try myself and unlock my MSO1104z.
So far, unfortunately, it hasn't worked ;(
First I tried Win7 (vm) and openocd in different configs, reinstalled usbblaster driver and ftdi multiple times.
PID/VID are default (checked), still openocd reports

--- Code: ---Error: unable to open ftdi device: usb_open() failed in procedure 'init'
--- End code ---

So far so good, thought maybe it is about the Windows being a VM, so I tried Linux Ubuntu 14.04.
On Linux I can get access to the JTAG and openocd 0.7.0 recognizes the usbblaster.

--- Code: ---openocd -d2 -f interface/altera-usb-blaster.cfg -f target/imx28.cfg
Open On-Chip Debugger 0.7.0 (2013-10-22-08:31)
Licensed under GNU GPL v2
For bug reports, read
http://openocd.sourceforge.net/doc/doxygen/bugs.html
debug_level: 2
Warn : Adapter driver 'usb_blaster' did not declare which transports it allows; assuming legacy JTAG-only
Info : only one transport option; autoselect 'jtag'
trst_and_srst separate srst_gates_jtag trst_push_pull srst_open_drain connect_deassert_srst
adapter_nsrst_delay: 100
jtag_ntrst_delay: 100
dcc downloads are enabled
--- End code ---
Which looks good so far, but a few seconds after it outputs;

--- Code: ---Info : This adapter doesn't support configurable speed
Error: JTAG scan chain interrogation failed: all ones
Error: Check JTAG interface, timings, target power, etc.
Error: Trying to use configured scan chain anyway...
Error: imx28.cpu: IR capture error; saw 0x0f not 0x01
Warn : Bypassing JTAG setup events due to errors
Info : Embedded ICE version 15
Error: unknown EmbeddedICE version (comms ctrl: 0xffffffff)
Info : imx28.cpu: hardware has 2 breakpoint/watchpoint units
Warn : WARNING: unknown debug reason: 0xf
Warn : ThumbEE -- incomplete support
--- End code ---

Anyone any idea how to solve it?
Since it reports "all ones", I figuered that there may be pullups/pulldowns required, but in the post it did't look like it?

Regards
Fluxx1122

Fluxx1122:
Ok, I got it!
using the newer ocd seems to fix it.

Now unlocked with all options ;)

But Crille77 got it right, it's got glacial speed, took about 10h for the 34MB needed to get the keys.

Thanks to all contributers who made this possible ;)

Regards
Fluxx1122

uski:

--- Quote from: PE1DHI on July 26, 2015, 10:56:51 pm ---I'am the owner from a brand new DSA832-TG and wonderd if someone can tell or has already hacked it or set free the options?

DSA832-TG
DSA8F1701xxxxx
Firmware 00.01.00
--- End quote ---

As far as I know the newest DSA815 are not hacked yet. I didn't read anything about the DSA832. Maybe you can dump its memory and post it, it may help (but it may expose your S/N depending on what part of the memory you are dumping)

I might buy a DSA832 if it becomes hacked -  otherwise it's just too expensive with no options.

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