[U-Boot-Users] u-boot for EmbeddedPlanet EP862 board

[" XOL "]

Ok.
I see this is really waste of time.
Now I got another idea. I still burn u-boot
at 0xFF80_0000
and I need to force PPC reset system think that I have
8Mbyte of Flash and not 16Mbyte. This will cause to
run bootloader from 0xFF80_0000 and not 0xFF00_0000.
In this way I could switch between this two options. 
The question is how to control it. 
I'm going to read about reset on PPC and as far as I remember 
this should be somewhere in strapping options.
What do you think about?
Thanks.

-----Original Message-----
From: Wolfgang Denk <wd at denx.de>
To: "XOL"  <xol at mail.ru>
Date: Mon, 21 Jul 2003 19:25:31 +0200
Subject: Re: [U-Boot-Users] u-boot for EmbeddedPlanet EP862 board 

> 
> In message <E19edct-0004wX-00.xol-mail-ru at f15.mail.ru> you wrote:
> > 
> > The problem could be because of the way I try to run it.
> 
> Probably.
> 
> > The original EP bootloader is burned at
> > FF00_0000 - FF08_FFFF
> > I do not want to erase it and put u-boot instead untill I'm sure
> > it will work. Otherwise I can loose a board because I have no
> 
> This cannot be done. To make U-Boot runnable by some other bootloader
> you will have to modify U-Boot. For example, you will have to disable
> the code which is responsible for initialization of the  SRDAM.  This
> is  very  sensible  code,  which  makes  for  some 99% of all trouble
> reports on this list. Now when you think everything is working  fine,
> you will have to enable this code, and use it - completely untested.
> 
> > BDM to burn it externally. 
> 
> Get yourself a BDI2000, or at least a BDM4GDB adapter.
> 
> > My question is if this approach can work?
> 
> It will NOT save you any effort, and it will NOT save you any risk.
> In other words: use wasted effort.
> 
> > What can be a problem of stuck. Does it metter to u-boot
> > to run on board after power up or reset or to run on already 
> > configured board.
> 
> Yes, this matters. U-Boot expects and requires a "virgin" CPU,  fresh
> out of reset.
> 
> 
> Best regards,
> 
> Wolfgang Denk
> 
> -- 
> Software Engineering:  Embedded and Realtime Systems,  Embedded Linux
> Phone: (+49)-8142-4596-87  Fax: (+49)-8142-4596-88  Email: wd at denx.de
> Harrison's Postulate:
> 	For every action, there is an equal and opposite criticism.
>