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Re: ecos bring up on s5pc100(cortex-a8)
Hi,
>> I am now porting ecos to Samsung S5pc100(cortex-A8).
>
> Great, that would be the first Cortex-A8 contribution back to the tree.
>
>> In the ecos.db, I add my own package and target.
>>
>> Can i use CYGPKG_HAL_CORTEXM as one of my packages in target?
>>
>> I've checked that cortex-m series and cortex-a series are both support thumb-2 instruction set.
>>
>> Am i right?
>
> Well, yes, the Cortex-M and Cortex-A families both have Thumb2 support
> in common. However, there are pretty significant differences between
> them:
>
> A series: cache/MMU, ARMv7-A instruction set, VFP, Jazelle, NEON,
> MPcore (A9,A15)
> M series: no cache/MMU, ARMv6-M ARMv7-M(E) instruction sets, FPU (M4), SIMD (M4)
>
> I would think the differences are enough that a new Cortex-A hal
> should be added. This may be more than you bargained for, but seems
> like the 'right' way to go.
>
> This is just my 2 cents on it. I hope someone else will chime in
> correct me if I'm off base here.
>
The Freescale i.MX51 implementation (which is a Cortex-A8 CPU) is based on eCos
ARM/ARM9 HAL's. I would suggest starting there instead of creating a new HAL.
Bye...
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