[U-Boot-Users] Help, how do I decouple the reset address from the hw config word on ppc82xx
Mark Doherty
mdoherty at arca-technologies.com
Wed Apr 30 15:20:01 CEST 2003
Thanks for the prompt Wolfgang,
It took a little bit of time to think through the u-boot lifecycle but now
it seems quite straight forward and works very well.
I've been able to glean quite a bit of info from past posts but there
doesn't seem any way to search the archives, do you have any suggestions?
Thx
Mark Doherty
Senior Engineer
**************************************
arca technologies
2 Trench Road
Mallusk, Belfast
Northern Ireland
BT36 4TY
*************************************
-----Original Message-----
From: Wolfgang Denk [mailto:wd at denx.de]
Sent: 14 April 2003 10:17
To: Mark Doherty
Cc: 'u-boot-users at lists.sourceforge.net'
Subject: Re: [U-Boot-Users] Help, how do I decouple the reset address
from the hw config word on ppc82xx
In message <9901EE1E8F8BD3119109009027A1B5F596AD5B at DIGINET2> you wrote:
> >
> > I've been attempting to build u-boot to run on an embedded planet ep8260
> > board reasonably sucessfully, however my board profile has flash
starting
> > at 0xFF000000, the reset vector is of course at 0xFFF00100. I've been
There are two errors in this sentence.
Forst, there is no fixed physcal address map. The address map of your
system is defined by whatever you program into your memory controller
registers. You don't have to map you flash at 0xFF000000; you could
chose any other address as well (but this isn't your problem here).
The second error is the "of course at 0xFFF00100". It could be at
0x100 as well, depending on the CIP/BMS settings in your HRCW.
(Actually 0x100 seems to be a much more "natural" setting to me).
> > scanning the code and build files looking for a reference to decouple
the
> > hardware configuration word at 0xFF00000 and the reset vector at
> > 0xFFF00100 so far with no real sucess.
This is your third error. You try to do something that is not
necessary. Read the User's Manual about how the memory controller
works, especially how boot memory space is defined (initial settings
of BR0[BA]).
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
He'd heard her use that sweet, innocent tone of voice before. It
meant that, pretty soon, there was going to be trouble.
- Terry Pratchett, _Truckers_
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