[En-Nut-Discussion] LPC2138 port

[addisu]

Hello,

Has anyone had any more luck with getting ethernut to work on LPC21xx?  I
have been looking at the port for LPC22xx on the Yagarto website but I am
not very familiar with linker scripts and start up codes so I havent had
much luck.

Thanks,
Addisu

Alain M. wrote:
> 
> 
> 
> Ole Reinhardt escreveu:
>> Hi,
>> 
>>> LPC2138 is a much better cpu than Atmel's. I will not change from 
>>> Nut/OS, but I would gladly change to LPC if it were possible.
>>>
>>> Just one comparison: LPC2138 runs at 60MHz zero wait states, SAM7 runs 
>>> at 55MHz one wait state. It's a BIG difference, even considering thumb
>>> mode.
>> 
>> One big drawbag is the limited amount of on-chip ram. 32 KB is quite
>> limited for a 32Bit CPU.
> 
> -------- From the DataSheet
> 32 kB of SRAM on the ARM local bus for high performance CPU access.
> 
> 16 kB SRAM for Ethernet interface. Can also be used as general purpose
> SRAM.
> 
> 8 kB SRAM for general purpose DMA use also accessible by the USB.
> -------
> 
> Which makes 56k, not that bad. The Ethernet and USB memories is on a 
> separate buses so that their DMA does not afect program speed. Using 
> them as general purpose RAM is slower.
> 
> This brings a drawback: it's architecture is much more complicated :(
> 
> Alain
> _______________________________________________
> http://lists.egnite.de/mailman/listinfo/en-nut-discussion
> 
> 

-- 
View this message in context: http://www.nabble.com/Smallest-%28lowest-cost%29-ATMEGA-to-run-NutOS-on---tf4434366.html#a13208400
Sent from the MicroControllers - Ethernut mailing list archive at Nabble.com.