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@lists.sourceforge.net [mailto:u-boot-users-admin@lists.sourceforge.net] On Behalf Of Vladimir Gurevich Sent: Friday, February 17, 2006 10:35 AM To: u-boot-users@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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