A simple DLP-USB1232H based JTAG programmer with OpenOCD support

DLP-USB1232H and OpenOCD based JTAG adapter

Here's a quick introduction to using a cheap FTDI FT2232H based module (left-hand side on the photo) as a JTAG programmer together with the OpenOCD JTAG software for ARM and MIPS devices. The module I am using for thіs purpose is a DLP Design DLP-USB1232H, which is available from various sources (Digikey, Mouser, Saelig, and probably others) for 20-30 bucks plus shipping, depending on where you live.

By properly connecting the correct pins of the DLP-USB1232H to the target JTAG
device (I used an Olimex STM32-H103 eval board for testing) you can easily abuse the DLP-USB1232H as JTAG programmer. As I chose the proper DLP-USB1232H GPIOs for the TRST and (S)RST pins, OpenOCD even worked out of the box, without having to change a single line of code.

The only thing that's required is to provide OpenOCD with an interface config file that uses the usbjtag "layout". I have already submitted that config file upstream, I guess it should be merged soonish.

The usage is then pretty simple:

  $ openocd -f interface/dlp-usb1232h.cfg -f board/olimex_stm32_h103.cfg

And in another xterm:

  $ telnet localhost 4444
  > init
  > reset halt
  > flash write_image erase fancyblink.bin 0x08000000
  > reset

This flashes the given fancyblink.bin image onto the STM32-H103 eval board via the DLP-USB1232H JTAG programmer, where fancyblink.bin is an example program from my libopenstm32 project (that aims to create a full-blown firmware library for ST STM32 microcontrollers, similar to what avr-libc does for AVRs). Contributions for libopenstm32 (license is GPLv3 or later) are highly welcome btw., hint hint...

  $ git clone git://

Full schematics, datasheets, and detailed instructions for the JTAG programmer are available from a small page I created in my Random Projects wiki, which is intended for the various smaller projects I'm working on that don't warrant getting their own domain, wiki, etc:

The Random Projects wiki is open-for-all btw, feel free to use it for any freeish, software or hardware projects of your own if you want.

Anyway, the DLP-USB1232H is a really nice device as it can also be used for many other purposes, such as USB-to-Serial or SPI BIOS chip programming, but more on that in another blog post... - a microblogging service based on Free Software, AGPL, and Creative Commons logo

After a long time of ignoring (or at least not using) micro-blogging services such as Twitter, I recently tried the Free-Software based service, and I'm beginning to like it.

The choice of service was pretty obvious — while Twitter uses proprietary software and has custom Terms of Service, is based on software under the GNU Affero General Public License, and the contents are CC-BY 3.0 licensed.

The code behind is called Laconica (recently renamed to StatusNet) and is hosted at gitorious:

 $ git clone git://

My account details are available under, where I'm posting smaller announcements and notes about random technical stuff I'm working on (slightly more regularly than in this blog). Sometimes I use the web interface for posting, but using the Jabber integration available at is even more convenient. You can both be notified of new posts ("dents") in real time via Jabber, as well as post your own dents from within your Jabber client, which is nice. seems to become more popular every day, which will hopefully make the proprietary Twitter pretty much irrelevant sooner or later.

Open-Source software for LightScribe CDs and DVDs?

Dear Lazyweb,

is there any Free Software utility for putting those nice logos/images on LightScribe CDs or DVDs? I'm considering buying such a CD/DVD burner, but only if there's open-source software to control the device. I guess burning CDs/DVDs should be no problem using wodim/cdrecord, but adding images as labels on the CD/DVD is likely not possible without special software.

I know about the LightScribe Linux software (which is binary-only and not open-source, it seems) and LaCie LightScribe Labeler for Linux (which only creates labels but does not write them to the CD/DVD, and is not open-source either, I think).

Anyone aware of a Free Software utility for this? Or at least a public specification/datasheet which could be used for creating one? I might even be willing to join development if datasheets are available.

Qi Hardware: Freedom Redefined - New Open Hardware company to ship Ben NanoNote device in fall 2009

Qi Hardware Ben NanoNote

I recently stumbled over a neat new Open Hardware and Free Software friendly company — Qi Hardware — founded by former OpenMoko developers.

To quote from the website:

Qi Hardware, founded on the belief in open hardware, produces mass market quality hardware applying free software principles to consumer electronics. The three fundamental elements in our development are copyleft hardware, upstream kernels and community driven software.

They have put up a timeline for upcoming products, where the 本 NanoNote™ (Ben NanoNote™) — a fully open multifunction ultra small form factor computing device — is the first entry product that is supposed to ship in fall 2009.

The Ben NanoNote is based on an Ingenic SoC (336 MHz XBurst Jz4720 MIPS-compatible CPU) with 3.0” color TFT (320x240), 2GB NAND flash, 32 MB SDRAM, SDHC microSD, micro-USB 2.0. The whole device, including the 850mAh Li-ion battery, weighs only 126g. Detailed specs are available.

Their currently planned setup includes a Linux kernel, u-boot, and OpenWRT as software basis. Personally, I'd like to see a stock Debian running on the hardware sooner or later, of course. The 2GB of flash and 32MB of RAM should be fine for a small Debian system (for instance, my NSLU2 runs off a 1GB thumb drive and has 32MB RAM, and is still very useful).

The code is all GPL'd and available from various git repos, hardware will be CC-BY-SA 3.0 licensed, and they try to use Free Software design and development tools also, including KiCAD for schematics and PCB layout, and probably HeeksCAD as CAD tool for mechanical stuff.

gEDA/PCB logo
I'm really tired of seeing more and more self-proclaimed "Open Hardware" projects that often don't even mention any license for their schematics and PCBs, or use crappy, self-invented "open" licenses that are not even remotely open in any way. Probably even worse, many hardware related projects use closed-source, proprietary electronic design tools such as EAGLE or OrCAD, thereby ruining the whole project from the beginning by forcing everyone who likes to contribute or adapt the hardware to use non-free software. That's why I was really happy to see the Qi people thrive to use open tools from the beginning! I hope to see more hardware projects use KiCAD or gEDA/PCB for their designs in future...

Flashrom 0.9 release - Flashing your BIOS from the Unix/Linux command line

I have mentioned the flashrom utility in my blog in the past. This is a small command line tool which allows you to update your BIOS/coreboot/firmware chips without opening the computer and without any special boot procedures.

Yesterday, flashrom 0.9 was finally released. Here's a short passage from the release announcement:

After nine years of development and constant improvement, we have added support for every BIOS flash ROM technology present on x86 mainboards and every flash ROM chip we ever saw in the wild.

Highlights of flashrom include:

  • Parallel, LPC, FWH and SPI flash interfaces.
  • 157 flash chip families and half a dozen variants of each family.
  • Flash chip package agnostic. DIP32, PLCC32, DIP8, SO8/SOIC8, TSOP32, TSOP40 and more have all been verified to work.
  • 75 different chipsets, some with multiple flash controllers.
  • Special mainboard enabling code for dozens of nonstandard mainboards.
  • No physical access needed. root access is sufficient.
  • No bootable floppy disk, bootable CD-ROM or other media needed.
  • No keyboard or monitor needed. Simply reflash remotely via SSH.
  • No instant reboot needed. Reflash your ROM in a running system, verify it, be happy. The new firmware will be present next time you boot.
  • Crossflashing and hotflashing is possible as long as the flash chips are electrically and logically compatible (same protocol). Great for recovery.
  • Scriptability. Reflash a whole pool of identical machines at the same time from the command line. It is recommended to check flashrom output and error codes.
  • Speed. flashrom is much faster than vendor flash tools.
  • Supports Linux, FreeBSD, DragonFly BSD, Solaris, Mac OS X. Please refer to the README for build instructions.

Please note that rewriting your flash chip can be dangerous and flashrom developers make no guarantees whatsoever. That said, many users have successfully replaced proprietary tools such as awdflash, amiflash and afudos with flashrom.

Download: flashrom-0.9.0.tar.gz
SVN: svn co svn:// flashrom
Debian: apt-get install flashrom

Do yourself a favor and try flashrom next time you want to upgrade your BIOS. No more floppies or bootable CD-ROMs with DOS/Windows binaries or similar crap. Run flashrom conveniently from the Linux command line, or even via SSH or serial console if you want...

Syndicate content