Hi Wolfgang,

If I had a choice in using a boot address other than 0, I would use it, but this is a porting effort to an existing platform. I do not have a way to change it. So I'm stuck with what I've got.

And here's a snippet from the README that led me to the conclusion that this was common:

System Initialization:

In the reset configuration, U-Boot starts at the reset entry point (on most PowerPC systems at address 0x00000100). Because of the reset configuration for CS0# this is a mirror of the onboard Flash memory. To be able to re-map memory U-Boot then jumps to its link address.

So to say that this is completely wrong seems a little strong. What part am I specifically wrong about?

Believe me, I have little desire to modify a known, stable, widely available system that operates on a multitude of platforms and processors. I just want to get it right. I've read the README extensively and thanks to it I've gotten everything else straight; just this one item is causing me problems. Can you give me a hint as to where in the README I should look to find the information that resolves this issue?

Thanks,

Steve

-----Original Message----- From: wd@denx.de [mailto:wd@denx.de] Sent: Thursday, February 16, 2006 5:07 PM To: Steve Strublic Cc: u-boot-users@lists.sourceforge.net Subject: Re: [U-Boot-Users] PPC8xx chip select configuration at startup

In message 482F3C06ECF00C44AEC226520C6FCB1A51ECB6@EXCHANGEVS.HYPERCOM.COM you wrote:

My board boots to address 0x0, with FLASH located there. The desired location for FLASH memory will be at 0x0400_0000. This is the address

I recommend NOT to use such a low address.

space to which I link U-Boot. The way I understand U-Boot to work is that for PPC8xx platforms, FLASH memory is generally located at

address

0x0, and CS0 is required to map both address 0x0 and your absolute address space (0x0400_0000 in my example) so it can seamlessly jump

from

No, this is completely wrong.

that are contrary to what I require. What I ended up doing is program CS0 base and option registers with what I call 'boot' values, to correctly configure OR0 to allow this duplication of address space for

Please read the README. It's all dicumented there.

Best regards,

Wolfgang Denk