[U-Boot-Users] PPC8xx chip select configuration at startup

[Steve Strublic]

Vladimir, 

I've solved my problem thanks to your request for the values of CS0 at
power-up.

Here's how my board comes up at hard reset:

BR0	0400_0801
OR0	0000_0FF4 (the defaults)	

And this makes sense to me... the board boots at address 0, with FLASH
repeating at 0400_0000, 0800_0000, etc., and OR0 allows access to all
instances of the aliasing, with max wait states, relaxed timing, burst
inhibit, etc.

So guess what.  I got U-boot to run without the 'boot value'
modification to CS0 I had discussed.  I think my problem was related to
my debugging tool, the visionCLICK ICE... I had it configured to set
values into the target at reset.  So of course the values of BR0/OR0
were overridden with whatever I had in there... which were not the same
as what the board booted up with.  I hadn't occurred to me to look for
and turn off this option until you asked for the values.

So I can thankfully say this is a non-issue for me, and I don't have to
do anything to U-Boot, which pleases me greatly.

Thanks much for the help!

Steve

-----Original Message-----
From: u-boot-users-admin at lists.sourceforge.net
[mailto:u-boot-users-admin at lists.sourceforge.net] On Behalf Of Vladimir
Gurevich
Sent: Friday, February 17, 2006 10:35 AM
To: u-boot-users at lists.sourceforge.net
Subject: Re: [U-Boot-Users] PPC8xx chip select configuration at startup

Hi Steve,

Steve Strublic wrote:
> I understand that 0400_0000 is my choice; it's what we use in the
> current product implementation (an eCos-based solution).  It wouldn't
be
> a bad idea to bump it.
So, you are trying to use U-boot to boot some existing code that you
can't modify, correct?
> And I agree that the hard reset word may be other than what U-Boot's
> startup sequence requires, but I'm stuck.  I cannot spin the board to
> alter its contents.
>   
That's a pain.

Why don't you send  us the values of BR0/OR0 just after power-on reset
and what you'd like them to be so that we can take a look and see more
clearly what the problem is if it is there.

Happy hacking,
Vladimir



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