[OE-core] [PATCH 1/3] Add ARM tune file overhaul based largely on work from Mark Hatle

[Koen Kooi]

Op 29 jul. 2011 om 09:25 heeft Phil Blundell <philb at gnu.org> het volgende geschreven:

> On Thu, 2011-07-28 at 22:59 -0700, Khem Raj wrote:
>> here I guess we have to say AVAILTUNES += "arm920t arm920"
>> where arm920 is arm mode and 920t is thumb mode. but anyway I would 
>> prefer that thumb is optionally added provided user asked for it
>> through DISTRO/MACHINE features then we should first make sure
>> that selected machine has thumb feature and if yes for both then we 
>> should enable -mthumb compiler option which now it enable when thumb 
>> appears in TUNE_FEATURES
> 
> I don't think we want to go down the road of inventing CPU names for
> ARM-state variants of Thumb-capable cores.  (In other words, we
> shouldn't start putting things like "arm920" in AVAILTUNES when there
> isn't actually a core named arm920.)
> 
> Fundamentally I think you're right that the choice between ARM-state and
> Thumb-state (for t1 at least) ought to be under the control of the
> DISTRO and not selected purely on the basis of the hardware
> capabilities.  For t2 it is a bit less of a clear-cut issue but, if
> there are genuinely people making ARMv7 cores with the Thumb decoder
> removed, I guess we need to have that same switch there as well

Another issue is silicon bugs on early a8 revisions, but gcc and linux might have enough workarounds nowadays




> 
> p.
> 
> 
> 
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