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

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List:       openembedded-core
Subject:    [OE-core] [PATCH 1/3] Add ARM tune file overhaul based largely on work from Mark Hatle
From:       koen () dominion ! thruhere ! net (Koen Kooi)
Date:       2011-07-29 8:22:29
Message-ID: 198F4439-AE37-45A4-BB31-55854B6EA68F () dominion ! thruhere ! net
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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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