[ECOS] Re: Cortex M3 architecture

[Simon Kallweit]

Andrew Lunn schrieb:
>> I would think that Thumb2 processors like the M3 would need to
>> be a different architecture than ARM.  It's a different
>> instruction set -- isn't that what defines an architecture?
>>     
>
> With ARM it is all a bit messy. eg some of the processors support
> thumb2 as an add on, just like the support thumb. For such processors,
> you could add thumb2 support to the existing ARM architecture, with
> the understanding that all interrupt handling is done in the good old
> ARM instruction set. However user code could be in thumb/thumb2.
>
> For the Cortex M processors you cannot do this, so a new architecture
> is needed when you _only_ have thumb/thumb2. 
>
>   
So, I guess we should introduce a new architecture named "armv7m". I 
think this makes sense as we can then support both M3 and M1 as 
variants. What do you think?

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