I am using the 0021 IDE with a mature/working Duemilanouve board…
This post relates to the L (Pin 13) LED rapid flash syndrome. It appears to be common and there are several posts about this over an 18 month period. During the fast flash time, uploads are aborted. The LED flash starts about 7 seconds after poweron.
I tried uploading a simple “Hello LED” sketch DURING the short period after power on and before the LED goes into a 10Hz flash mode. This worked and at least temporally fixed the problem. Others have suggested this trick.
I could then upload complex sketches w/o problem. Then the “fast blink LED” problem returned! This is a pain and seems no one has really found the source of the issue.
FYI after the upload times out I get this error message;
avrdude: stk500_getsync(): not in sync: resp=0x00
avrdude: stk500_disable(): protocol error, expect=0x14, resp=0x51