Back in my university years I have had some issues with an Asus MIMIC CX200 camera. One of them got broken after a firmware upgrade so I have decided to fix it with JTAG. I have successfully got to UrJTAG to read the IDCODE of the S3C4510B, but I was unable to detect the flash. Now I know that I have had to tweak the bus driver and reveng the board a bit.

Here are some pics (shot with my Nokia 6230 in VGA res) about the trick:


Thin albanian wires were soldered directly to the pins.


Live together cry together series 100 Ohm level shifter JTAG adapter to LPT port.


I have designed an addon board to expose the CPU's intresting interfaces (2 serial, USB, JTAG)



It is fun to look back to those pictures from now. After 5 years we got to a state when it is easier and cheaper to buy a Rpi to solve the same problem rather than fixing that board...

Ingredients:
urJTAG source from SVN or Git.
Cygwin: install the packagelist from here: https://dl.dropboxusercontent.com/u/4295670/packagelist with the technology described here:
http://blag.nullteilerfrei.de/2014/01/3 ... -packages/

The python binding is broken so run the ./autogen.sh with --disable-python option.

Add

#define WINAPI_FAMILY 2
#define NOUSER

befor, and

#ifdef IN
#undef IN
#endif

#ifdef OUT
#undef OUT
#endif

fter the #include <windows.h> into the sysdep.h

Run
make -j 8 CFLAGS='-Wno-char-subscripts -Wno-unused-value'

The Freeescale support was very gently, so they are provided a free replacement for my dead USB-TAP. Of course I have disassembled it to check that did they added ESD protection to the USB lines.
Yes they did:

Let's get started with two pictures of the Freescale Codewarrior USB-TAP's PCB:




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I have tried to use the Lattice ispVM under Ubuntu 11.04, with the Lattice USB download cable, but I have to run it as root, even after adding the udev rules mentioned in the FAQ.

After some strace analyzing I have figured out that it is trying to open the /dev/bus/usb/{roothub}/{devide} nodes. Since then the download cable's node was read only it failed.

I have written the following udev rule to the /etc/udev/rules.d/51-lattice.rules file inspired by my AVR doper's rule:


SUBSYSTEM=="usb", ACTION=="add", ATTR{idVendor}=="1134", ATTR{idProduct}=="8001", MODE="0666"