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@denx.de To: "XOL" xol@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@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@denx.de Harrison's Postulate: For every action, there is an equal and opposite criticism.