[ECOS] 860T redboot...almost there...but need a bit of help

[ECOS] 860T redboot...almost there...but need a bit of help

[Michael Dorin]

It has taken a while, working on and off, but I have
finally made some good progress.

I can build and boot redboot, using the ROMRAM
configuration.  

However, I still need to set the program counter
to 0x100 through my bdm port.  If I power cycle
the board, it won't boot. 

I understand this is because my flash is bigger
than 1 meg...but how do I remap the reset vectors
in redboot to land up higher?

Thanks, 
 Mike

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Re: [ECOS] 860T redboot...almost there...but need a bit of help

[Gary Thomas]

On Mon, 2005-06-27 at 13:55 -0700, Michael Dorin wrote:
> 
> It has taken a while, working on and off, but I have
> finally made some good progress.
> 
> I can build and boot redboot, using the ROMRAM
> configuration.  
> 
> However, I still need to set the program counter
> to 0x100 through my bdm port.  If I power cycle
> the board, it won't boot. 
> 
> I understand this is because my flash is bigger
> than 1 meg...but how do I remap the reset vectors
> in redboot to land up higher?

Look carefully at one of the other 8xx ports.  

Basically how it works is that after reset, the *only* thing
that is mapped in is ROM/FLASH, CS0.  You run using this,
up to the point where everything else is set up and then
switch address spaces to match how you've set up the CSx.

-- 
------------------------------------------------------------
Gary Thomas                 |  Consulting for the
MLB Associates              |    Embedded world
------------------------------------------------------------


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