[U-Boot-Users] BDI vs. Lauterbach

Andrey Volkov avolkov at varma-el.com
Mon Apr 10 20:04:19 CEST 2006

On Monday, April 10, 2006, Wolfgang Denk wrote:

> Dear Andrey,

> in message <1618325846.20060410201725 at varma-el.com> you wrote:
>> > This does not mean anything. I haven't seen a single case  where  the
>> > network  speed  was  the limiting factor. Shuffeling the data through
>> > the JTAG is usually much slower.
>> Not always. As ex.:  allowable MPC5200 JTAG's clock is ... 25 MHz,
>> clock of 10 Mbit eth is ... + tcp stack overhead. And now we run
>> memory dump command and measure.

> But the 25 MHz also includes a LOT of JTAG communication overhead.  I
> think you won't get even close to a raw 10 Mbps data rate, but I have
> to  admit  that  I  never  actually  measured  it yet. Did you really
> measure this? For example,  what  difference  do  you  get  when  you
> connect your Lauterbach to a 10 Mbps port vs. a 100 Mbps port?
> [This is a serious question; I have never been able  to  run  such  a
> test myself yet.]
Unfortunately, but I have not access to a Lauterbach anymore (as I say,
I work with it 3 years ago), so I couldn't run this test too :(.


Andrey Volkov

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