URL:
<http://savannah.nongnu.org/bugs/?26910>
Summary: Terminal mode over USB/Dragon: dumping Flash is
extremely slow
Project: AVR Downloader/UploaDEr
Submitted by: troutrou
Submitted on: Mon 29 Jun 2009 15:11:42 UTC
Category: None
Severity: 3 - Normal
Priority: 5 - Normal
Item Group: None
Status: None
Privacy: Public
Assigned to: None
Originator Name: Vincent Trouilliez
Originator Email:
Open/Closed: Open
Discussion Lock: Any
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Details:
I really love the terminal mode. I used to have a DIY parport cable, and
dumping Flash content was blazingly fast, I used it often. However I have now
purchased a Dragon to replace my DIY cable, and it appears that dumping a
single tiny litle KB of data takes... 60 seconds ! IOW, this feature has
become useless :-(
I enquired a lot on avr-chat, and it would seem that the problem is due to
avrdude reading Flash bytes one at a time, and that although this is fast over
parport, it's is extremely inefficient over USB, because of the very nature of
USB.
So I think this could be fixed simply by NOT reading bytes one by one, but
instead read a block of for example 2KB (which takes about one second, this is
fast enough), regardless of how many bytes the user asked for. So if, say, I
ask for 128 bytes, avrdude reads 2KB in one go, in order to retrieve data
quickly, then displays only the first 128 bytes (or whatever the user asked
for) on the screen.
This way the user gets to see the data very fast, no matter if he asked for
just a few bytes, or a few KB's.
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