From: Clemens Koller <clemens.koller@anagramm•de>
To: Robert Woodworth <rwoodworth@securics•com>
Cc: linuxppc-embedded@ozlabs•org
Subject: Re: Xilinx Virtex4 FX PPC
Date: Wed, 22 Aug 2007 00:14:22 +0200 [thread overview]
Message-ID: <46CB63BE.2050700@anagramm.de> (raw)
In-Reply-To: <1187630817.6336.34.camel@PisteOff>
Hi, Robert, Josh
>>> Question 1:
>>> Do I need a special glibc for the Xilinx PPC 405????
>>> Does a normal PPC glibc have more "advanced" instructions compiled in
>>> that will not work on a Xilinx PPC 405??
Have a look at the eglibc project (embedded glibc) at http://www.eglibc.org
I think they support all kind of soft-fp configurations.
(i.e. The stuff seems to work fine on my MPC8540 e500 core with soft-fp)
>> Make sure you're building glibc with soft-fp, or make sure you have
>> CONFIG_MATH_EMULATION enabled in your kernel. The PPC 405 doesn't have
>> an FPU.
>>
>> josh
>
> CONFIG_MATH_EMULATION fixed it!!
>
> What are the opinions out there?
> Kernel fp or glibc soft-fp??
AFAICT: soft-fp in (e)glibc. They should be faster / hopefully more
optimized to your specific cpu.
Regards,
--
Clemens Koller
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next prev parent reply other threads:[~2007-08-21 22:14 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-08-20 16:00 Xilinx Virtex4 FX PPC Robert Woodworth
2007-08-20 16:35 ` Josh Boyer
2007-08-20 17:26 ` Robert Woodworth
2007-08-20 17:42 ` Grant Likely
2007-08-20 17:50 ` Stephen Neuendorffer
2007-08-21 22:14 ` Clemens Koller [this message]
2007-08-20 17:50 ` Grant Likely
2007-08-21 8:52 ` Stelios Koroneos
2007-08-21 12:57 ` Josh Boyer
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