From: Michael Olbrich <m.olbrich@pengutronix.de>
To: ptxdist@pengutronix.de
Subject: Re: [ptxdist] OSELAS Toolchain: cortexa9 config
Date: Fri, 8 Aug 2014 09:44:14 +0200 [thread overview]
Message-ID: <20140808074414.GJ28454@pengutronix.de> (raw)
In-Reply-To: <53E46A0F.3010507@optimeas.de>
Hi,
On Fri, Aug 08, 2014 at 08:11:27AM +0200, Matthias Klein wrote:
> what is the reason that the cortexa9 config is removed in recent
> toolchain versions?
>
> (Version 2012.12.1 was the last version with a cortexa9 config)
>
>
> Can I simply use the cortexa8 toolchain to produce cortexa9 code?
No, use arm-v7a-linux-gnueabihf, it optimizes for cortex-a9 and uses neon
optimizes memcpy etc. when possible. To optimize you code correctly set
this in the platformconfig:
PTXCONF_TARGET_EXTRA_CFLAGS="-mcpu=cortex-a9 -mfpu=neon"
PTXCONF_TARGET_EXTRA_CXXFLAGS="-mcpu=cortex-a9 -mfpu=neon"
Note: only add -mfpu=neon if your CPU has NEON. That's optional for cortex-a9.
Michael
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prev parent reply other threads:[~2014-08-08 7:44 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-08-08 6:11 Matthias Klein
2014-08-08 7:44 ` Michael Olbrich [this message]
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