[En-Nut-Discussion] Nut/OS AT90CAN128 Update

[Henrik Maier]

Hello list,

after spending quite a bit of time on porting Nut/OS to the AT90CAN128 
MCU a few months ago, I then stopped my porting efforts and even the 
production of our Ethernut compatible AT90CAN128 based XNUT-105 board 
after I discovered the xram stack silicon bug of the AT90CAN128. In the 
mean time the silicon bug has been confirmed by Atmel and made it's way 
into the official errata.

Sometimes it is good idea to stop a project where you get stuck because 
of unforeseen circumstances and continue after a break with fresh ideas. 
I now found a reasonable simple way to modify the stack allocation 
mechanism of Nut/OS to operate two heaps, one for data and one for stack.

The concept has proven to work and I am running reliably the httpd demo 
application on our XNUT-105 board.

I will continue to fine-tune this approach and soon discuss in his forum 
the best model to integrate my AT90CAN128 Nut/OS branch with the 
official Nut/OS head revision.


Henrik
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