JTAG UART Gotcha...

[Altera_Forum]

I've just been bitten by the JTAG UART hanging my system when the USB cable was disconnected.  

 I&#39;d read about the dangers of the &#39;small&#39; mode, and I have a valid system clock timer, etc..  But, it turns out my problem was the order of the JTAG UART vs. SYS_CLK_TIMER in SOPC builder - the UART was trying to initialise before the clock, so it&#39;s call to alt_alarm_start was failing silently, and the timeout procedure never gets called...  Easy to fix, but a pain to track down... http://forum.niosforum.com/work2/style_emoticons/<#EMO_DIR#>/sad.gif    - Roddy

[Altera_Forum]

What do you mean by &#39;order&#39;. I thought device init order was canned - so how did you fix it?

[Altera_Forum]

Devices are initialised in the order they appear in SOPC builder, so you use the &#39;move up/move down&#39; buttons to place the clock above the JTAG UART. alt_sys_init.c will then get rebuilt to reflect this new ordering. 

 - Roddy