On Sunday, August 07, 2011 07:50:42 Raúl Porcel wrote:
> The problem is that during the history of the ARM architecture(according
> to the wikipedia, the architecture was introduced back in 1981) there
> has been some subarchitectures(the most available are armv4, armv4t,
> armv5t, armv6j and armv7-a) which include new functions that is not
> available on the previous subarchitecture. Something like SSE, SSE2,
> SSE3, etc... but in arm is called SIMD, NEON, etc...
> 
> Apart from that, there are some apps that only work in one
> subarchitecture because it uses some capabilities only available on that
> subarchitecture and newer. Which is the case of valgrind. It only works
> with armv7-a. Also there's www-client/chromium, which later versions
> only work on >=armv6j.
> 
> With subprofiles we could keyword such packages, mask them globally on
> arm and unmask it on the subprofile of the subarchitecture that supports
> it.
> 
> We build stage3s for the armv4t, armv5te, armv6j, armv7a
> subarchitectures, and we'll make them use the profiles.

makes sense to me
-mike

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