[ECOS] Redboot run image issues

Chris Zimman czimman@bloomberg.com
Mon Feb 23 09:43:00 GMT 2009

> My final intent is to get my redboot port to boot from the NAND flash.
> I am trying to run this image  from NAND flash but it gets stuck even
> before spitting anything on the console. Hence i turn to the BDI
> debugger where i try running the image from RAM and see if it works.

Without having seen your code, I don't know exactly what you're doing at
startup, but booting from flash vs. starting from memory *typically* will use
a different code path as far as the startup is concerned.  

Because NAND isn't linearly addressable, in a typical NAND boot scenario, it
usually copies a very small amount of code from the NAND into a local buffer
and starts executing from there.  That code is responsible for getting the
rest of the code out of NAND and into memory.  Just taking a quick look at
the Freescale site, it appears that for at least some version of Redboot,
they've made the necessary change to copy the Redboot image from NAND into




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