[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

RE: [microblaze-uclinux] Jtag Debug

Kevin,
I know! My whole design team has been grappling around this subject for a month now. We cannot seem to make it go any faster! The performance I'm seeing is as though its running off a 200k Hz clock, which is what the JTAG clk is if I remember correctly. The thing that made me realize that was moving my design from a 50MHz SP3-400 board to the 100MHz ML401 board. Even just from changing the SDRAM bottleneck to a DDR bottleneck, I should have seen an increase in performance. The two designs run at startlingly similar rates. The code I run does 10 FFTs, with the counter you saw timing out the interval necissary to compute those 10 FFTs. That is how I know I get a little better than one FFT per second. I dunno if anyone here is a big EDK user, but that's where my problem probably is. I thoughr the -g option was the only one involved in producing debug symbols and thus would remove any extra software motion caused by the debug hardware if I took it out. Should I build my design from the start with NO debug hardware or software support (one of the early menus in EDK BSB)? I think I'm gonna try that. The other problem is that I havent figured out how to write my configuration and software to flash and then load them at power-on. Due to that limitaiton, my system never runs fully independently, I have to load the code via JTAG and XMD. We gettin there? :D 

Thanks,
Andy



From: "Kevin Chen" <kevin.chen@xxxxxxxxxx>
Reply-To: microblaze-uclinux@xxxxxxxxxxxxxx
To: <microblaze-uclinux@xxxxxxxxxxxxxx>
Subject: RE:  [microblaze-uclinux] Jtag Debug
Date: Thu, 27 Oct 2005 11:25:29 +0800

Hi, Andy,

It should not run that slow. There is a timer interrupt connected to the
interrupt controller. Is the interrupt enabled?

I've done with similar design on ML401 and test the Dhrystones out of
DDR memory. It's quite fast actually.

kevin


-----Original Message-----
From: owner-microblaze-uclinux@xxxxxxxxxxxxxx
[mailto:owner-microblaze-uclinux@xxxxxxxxxxxxxx] On Behalf Of Abot
Botbot
Sent: Wednesday, October 26, 2005 9:27 PM
To: microblaze-uclinux@xxxxxxxxxxxxxx
Subject: [microblaze-uclinux] Jtag Debug

Hey Friends,

   This might be considered off topic, but I think I'm missing a
fundamantal explanation for the performance that I get. Here's my basic
design flow, which doesn't use uCLinux yet, I was just trying to verify
that the DSP functionality I want is possible on the microblaze... I
download the XMD stub to the board, then run "dow executable.elf" from
XMD and type "run"...
This sets my code in motion, but it seems to be going extremely slow.
It's running entirely out of SRAM, but that shouldn't be the only factor
in the performance I'm seeing... I'm wondering if my whole system is
running over the JTAG clock and putting out debug symbols to the PC,
even though I'm not observing them, and I took the -g option out of the
compiler flags.. So two questions... Am I running in some debug mode
where it is running much slower than it could be... How do I get the
hardware to run independantly, if it is in some debug mode.. After I
finish a few things for my graduate classes (mid terms, blech!) I will
get back on the uCLinux train and get that running on my ML401 board.
Thanks for any help you can give! I'll attatch some files in case anyone
thinks looking at them will help them to understand.

Thanks,
Andy

_________________________________________________________________
Express yourself instantly with MSN Messenger! Download today - it's
FREE!
http://messenger.msn.click-url.com/go/onm00200471ave/direct/01/


___________________________
microblaze-uclinux mailing list
microblaze-uclinux@xxxxxxxxxxxxxx
Project Home Page : http://www.itee.uq.edu.au/~jwilliams/mblaze-uclinux
Mailing List Archive : http://www.itee.uq.edu.au/~listarch/microblaze-uclinux/ 



_________________________________________________________________
Express yourself instantly with MSN Messenger! Download today - it's FREE! http://messenger.msn.click-url.com/go/onm00200471ave/direct/01/ 

___________________________
microblaze-uclinux mailing list
microblaze-uclinux@xxxxxxxxxxxxxx
Project Home Page : http://www.itee.uq.edu.au/~jwilliams/mblaze-uclinux
Mailing List Archive : http://www.itee.uq.edu.au/~listarch/microblaze-uclinux/