From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from moutng.kundenserver.de (moutng.kundenserver.de [212.227.126.177]) by ozlabs.org (Postfix) with ESMTP id A91DDDDEB9 for ; Wed, 22 Aug 2007 08:14:26 +1000 (EST) Message-ID: <46CB63BE.2050700@anagramm.de> Date: Wed, 22 Aug 2007 00:14:22 +0200 From: Clemens Koller MIME-Version: 1.0 To: Robert Woodworth Subject: Re: Xilinx Virtex4 FX PPC References: <1187625654.6336.28.camel@PisteOff> <20070820113549.7cc3ac45@weaponx.rchland.ibm.com> <1187630817.6336.34.camel@PisteOff> In-Reply-To: <1187630817.6336.34.camel@PisteOff> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Cc: linuxppc-embedded@ozlabs.org List-Id: Linux on Embedded PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , 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 _______________________________ R&D Imaging Devices Anagramm GmbH Rupert-Mayer-Str. 45/1 81379 Muenchen Germany http://www.anagramm-technology.com Phone: +49-89-741518-50 Fax: +49-89-741518-19