From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from gate.crashing.org (gate.crashing.org [63.228.1.57]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (Client did not present a certificate) by ozlabs.org (Postfix) with ESMTPS id 931841007D8 for ; Fri, 17 Sep 2010 08:04:00 +1000 (EST) Subject: Re: linux support for freescale e5500 core? From: Benjamin Herrenschmidt To: Chris Friesen In-Reply-To: <4C928FC5.9050700@genband.com> References: <4C9278CD.10607@genband.com> <20100916163911.6255d359@schlenkerla.am.freescale.net> <4C928FC5.9050700@genband.com> Content-Type: text/plain; charset="UTF-8" Date: Fri, 17 Sep 2010 08:03:48 +1000 Message-ID: <1284674628.30449.98.camel@pasglop> Mime-Version: 1.0 Cc: Scott Wood , linuxppc-dev@ozlabs.org, paulus@samba.org, timur@freescale.com List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , On Thu, 2010-09-16 at 15:44 -0600, Chris Friesen wrote: > On 09/16/2010 03:39 PM, Scott Wood wrote: > > On Thu, 16 Sep 2010 14:06:37 -0600 > > Chris Friesen wrote: > > > >> We're looking at maybe doing some work with an e5500-based system. Is > >> there any support existing/planned for this core? > > > > Check with whoever you'd be getting the hardware from about a BSP. > > > > And yes, it should be supported upstream at some point. > > We haven't settled on a vendor yet, so I was just wondering in general > what the story was around support. Well, the "core" support for 64-bit BookE is upstream (and has been for a little while) so +/- specific tweaks FSL may have done and the usual SoC/board support, it shouldn't be too far off. > Right. We currently use a 970-series cpu and have implemented a > per-process flag to indicate whether 32-byte mode is needed or not. > We'd have to do something similar with the new cpu. Sounds like a candidate for upstreaming the patch :-) > One last question--can you comment on the speed of an e5500 relative to > a 970 for integer operations? Cheers, Ben.