[ptxdist] OSELAS Toolchain: cortexa9 config

[ptxdist] OSELAS Toolchain: cortexa9 config

[Matthias Klein]

Hello,

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?


Best regards,
Matthias


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Re: [ptxdist] OSELAS Toolchain: cortexa9 config

[Michael Olbrich]

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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