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- There are three separate lights, CPU, DRAM, and VGA. The manual says that if one lights up, it indicates that it was not detected or it failed. However, I'm not sure if the LEDs are meant to stay lit -- when I boot the system (still without a graphics card installed), the DRAM LED lights up for about half a second or so, then shuts off.
- Debugging embedded software is my least favorite activity but unfortunately a necessary evil. Thankfully recent advances in technology and tool chain innovation has resulted in a plethora of techniques to drastically speed up the debugging process. Let’s examine a few techniques starting from our traditional debugging by break-point through the more advanced instrument
- Another issue along with the DRAM debug led is that, once powered on, the reset button does not work (have checked polarity and reseated reset sw connector in front panel header three times), but I also cannot hard power off the computer by either pressing the power button or by holding it down—the computer will only power off when I turn off the power supply
- JTAG is not JUST a technology for programming FPGAs/CPLDs. The debug and programming tools commonly associated with JTAG only make use of one aspect of the underlying technology – the four-wire JTAG communications protocol. These four signals, collectively known as the Test Access Port or TAP, are part of IEEE Std. 1149.1.
- For a more versatile debugging tool, though, a serial port is a good solution. To save cost and PCB real-estate you may find it useful to use an plug-in module that contains the RS232 converters. If you are trying to provide a longer term indication of status as part of the normal operation of your product, LEDs are again a cheap an simple method.
