[U-Boot-Users] [uboot] Walnut PPC405GP flash

[Stefan Roese]

On Monday 21 April 2008, 甜瓜 wrote:
> Yep! The ppcboot is very ancient. hehe.
> Actually, my board is DHT-walnut: http://elinux.org/DHT-Walnut_U_Boot

So, it's no "real" Walnut. Then the official Walnut U-Boot will probably not 
work for your board.

> The web provides a pre-compiled bin uboot 1.1.4  for my board. The size is
> 256KB.

4xx U-Boot images need to get loaded at the "end" of flash. So a 256k image 
need to get loaded at 0xfffc0000.

> I downloaded it, and burn this bin into flash. But the board is still not
> work.
> Well, you point out a very important thing that 4xx use 0xfffffffc as the
> reset vector.
> My flash is 512KB larger, therefore the bin only fills the first 256KB of
> the flash.
> The reset vector is not set correct. Am I correct? It seem that it depends
> on how CPU
> maps flash contents into address space. And how to set it? I don't know
> how to determine the real entry of a specific uboot-bin.  :<

As mentioned above, you have to program a 256k image to 0xfffc0000.

Best regards,
Stefan

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