From mboxrd@z Thu Jan 1 00:00:00 1970 From: Kumar Gala Subject: Re: Representing Embedded Architectures at the Kernel Summit Date: Fri, 19 Jun 2009 02:53:23 -0500 Message-ID: References: <1243956140.4229.25.camel@mulgrave.int.hansenpartnership.com> <20090618025125.GA26531@linux-sh.org> <20090619030009.GB16806@linux-sh.org> Mime-Version: 1.0 (Apple Message framework v935.3) Content-Type: text/plain; charset=US-ASCII; format=flowed; delsp=yes Content-Transfer-Encoding: 7bit Return-path: Received: from gate.crashing.org ([63.228.1.57]:43953 "EHLO gate.crashing.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751362AbZFSHxf (ORCPT ); Fri, 19 Jun 2009 03:53:35 -0400 In-Reply-To: <20090619030009.GB16806@linux-sh.org> Sender: linux-arch-owner@vger.kernel.org List-ID: To: Paul Mundt Cc: James Bottomley , ksummit-2009-discuss@lists.linux-foundation.org, linux-arch@vger.kernel.org, linux-embedded@vger.kernel.org On Jun 18, 2009, at 10:00 PM, Paul Mundt wrote: > On Thu, Jun 18, 2009 at 09:59:20PM -0500, Kumar Gala wrote: >> >> On Jun 17, 2009, at 9:51 PM, Paul Mundt wrote: >> >>> On Wed, Jun 17, 2009 at 09:31:48AM -0500, Kumar Gala wrote: >>>> One topic that was partially touched on was dealing with various >>>> memories on embedded systems. We have several sram based >>>> allocators >>>> in the kernel for various different arch's: >>>> >>>> - Blackfin sram allocator arch/blackfin/mm/sram-alloc.c >>>> - Lite5200(b) sram allocator arch/powerpc/sysdev/bestcomm/sram.c >>>> - AVR32 sram allocator arch/avr32/mach-at32ap/at32ap700x.c and >>>> arch/ >>>> avr32/mach-at32ap/include/mach/sram.h >>>> - Potential davinci sram allocator >>>> >>>> There maybe others. >>>> >>> SH does this through NUMA on SRAM blocks that are anywhere from >>> 128kB to >>> 64MB. Some of our SMP configurations have upwards of a dozen of >>> these >>> blocks. >> >> Do you really have that much on chip memory? >> > Is this really a serious question? If we didn't, I would not have > mentioned it. It was. I'm not familiar with SH hardware so wasn't sure if there was some other application you had for the multiple regions. - k