[U-Boot-Users] RAM vs. ROM version of PPCBoot

[Ken Chou]

Hi,

Not everyone has BDI-2000 and FLASH!
The measurement will have bigger delta in the case of neither bdi-2000
nor FLASH.  It depends on the code size also.

It is just added convenience (which the engineering is about: to make
life a little easier ;-)

It is not absolutely needed to be in CVS since it is trivial. 
Yet, I see it is beneficial for some to have it in CVS.

Ken Chou

> -----Original Message-----
> From: Chris Hallinan [mailto:clh at net1plus.com]
> Sent: Tuesday, December 03, 2002 1:32 PM
> To: wd at denx.de
> Cc: u-boot-users at sourceforge.net
> Subject: RE: [U-Boot-Users] RAM vs. ROM version of PPCBoot
> 
> Wolfgang Denk wrote:
> >
> > In message
> > <NEBBKJPFOLJNBMFNKBIIKENKDCAA.clh at net1plus.com> you wrote:
> > >
> > > > Why RAM version?
> > > > Mostly, the convenience is the main reason.
> > >
> > > I can't imaging debugging PPCBoot (or most other flash-resident)
> > > code any other way.
> >
> > Oops? To me it makes absolutely no difference if the code
> >  is  runing
> > from  RAM  or  ROM.  Debugging  is exactly the same (OK,
> > you might be
> > limited regarding thenumber of breakpoints when running
> > from ROM, but
> > usually this is no real handicap).
> 
> I agree with your comments.  The main reason I use RAM version is
> for load speed.
> 
> OK, OK, I just timed it.  To erase/program flash using BDI-2000, it
> takes
> erase: 3 seconds
> prog:  6 seconds (with WORKSPACE enabled)
> 
> and to load into RAM:
> load:  2 seconds (with dcache disabled)
> 
> So, you're right, the difference isn't really that much! :)
> 
> -Chris Hallinan
> DS4.COM, Inc.
> 
> 
> 
> 
> 
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