Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751380AbWJ1T7M (ORCPT ); Sat, 28 Oct 2006 15:59:12 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751381AbWJ1T7M (ORCPT ); Sat, 28 Oct 2006 15:59:12 -0400 Received: from styx.suse.cz ([82.119.242.94]:64660 "EHLO mail.suse.cz") by vger.kernel.org with ESMTP id S1751380AbWJ1T7L (ORCPT ); Sat, 28 Oct 2006 15:59:11 -0400 Date: Sat, 28 Oct 2006 21:57:39 +0200 From: Vojtech Pavlik To: Lee Revell Cc: Andi Kleen , thockin@hockin.org, Jiri Bohac , Luca Tettamanti , linux-kernel@vger.kernel.org, john stultz Subject: Re: AMD X2 unsynced TSC fix? Message-ID: <20061028195739.GA18879@suse.cz> References: <1161969308.27225.120.camel@mindpipe> <68676e00610271700i741b949frc73bf790d38ab1f@mail.gmail.com> <20061028024638.GA16579@hockin.org> <200610272059.13753.ak@suse.de> <1162059732.14733.8.camel@mindpipe> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1162059732.14733.8.camel@mindpipe> X-Bounce-Cookie: It's a lemon tree, dear Watson! User-Agent: Mutt/1.5.9i Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1266 Lines: 31 On Sat, Oct 28, 2006 at 02:22:11PM -0400, Lee Revell wrote: > On Fri, 2006-10-27 at 20:59 -0700, Andi Kleen wrote: > > > Fortunately, we usually have an HPET, these days. You can > > definitely > > > resync and get near-linear values of RDTSC. > > > > No we don't -- most BIOS still don't give us the HPET table > > even when it is there in hardware. In the future this will change sure > > but people will still run a lot of older motherboards. > > I have exactly such a system (see thread "x86-64 with nvidia MCP51 > chipset: kernel does not find HPET"). Is there anything at all I can do > to make the kernel see the HPET? Can I try to guess the address? BIOS > upgrade? In most cases where the HPET is present but not reported, it's not configured. Usually, you need to write a chipset-specific register to configure the address. Finding the register, finding some free MMIO space, writing the address to the register and telling the address to the kernel is enough. -- Vojtech Pavlik Director SuSE Labs - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/