Difference between revisions of "Verdex JTAG"
Ashcharles (Talk | contribs) (Created page with "This page explains one way to use OpenOCD JTAG software with verdex pro. This is useful for hardware debugging and reflashing verdex boards. == Get OpenOCD === Start by downloa...") |
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Revision as of 15:01, 30 September 2011
This page explains one way to use OpenOCD JTAG software with verdex pro. This is useful for hardware debugging and reflashing verdex boards.
Get OpenOCD =
Start by downloading OpenOCD. To get the latest features and support for your particular JTAG adapter, build from source. If you are using a JTAG adapter that connects to your computer via USB, you'll likely need to enable libftdi support.
$ git clone git://openocd.git.sourceforge.net/gitroot/openocd/openocd $ cd openocd $ ./configure --enable-ft2232_libftdi $ make -j2
At this point, you can install it with a sudo make install. I just ran in place:
$ ./src/openocd -s tcl -f tcl/interface/flyswatter.cfg -f tcl/board/verdex.cfg
Three important notes:
- your verdex should be powered and connected via JTAG
- replace -f tcl/interface/flyswatter.cfg with the configuration for your particular JTAG adapter
- if -f tcl/board/verdex.cfg is not available, try using -f tcl/board/voipac.cfg instead (I've submitted a patch but it may take a while to get included)
If all goes well, you should see something like this:
Open On-Chip Debugger 0.6.0-dev-00084-gdaa4147 (2011-09-26-16:43) Licensed under GNU GPL v2 For bug reports, read http://openocd.berlios.de/doc/doxygen/bugs.html Info : only one transport option; autoselect 'jtag' adapter_nsrst_delay: 260 jtag_ntrst_delay: 250 Info : verdex.cpu: hardware has 2 breakpoints and 2 watchpoints trst_and_srst separate srst_gates_jtag trst_push_pull srst_open_drain 50000 kHz Info : clock speed 6000 kHz Info : JTAG tap: verdex.cpu tap/device found: 0x89265013 (mfg: 0x009, part: 0x9265, ver: 0x8)
Using JTAG
With the OpenOCD daemon running, open a new terminal window and fire up a telnet (or gdb) session:
$ telnet localhost 4444
You can now play with JTAG. Hint: the help command is pretty useful.
Reflashing
These are the steps I followed to reflash my board starting from a telnet session:
reset halt flash write_image erase unlock /home/ash/u-boot.bin flash write_image erase unlock /home/ash/rootfs.jffs2 0x00040000 flash write_image erase unlock /home/ash/uImage 0x01e00000
Notes:
- you need to specify absolute ('~' doesn't count) paths to your files ('u-boot.bin', 'rootfs.jffs2', 'uImage')
- for XM4 boards, change '0x01e00000' to '0x00e00000'
- for debugging/unbricking, it certainly isn't necessary to flash all three components---just u-boot.bin is sufficient
