From owner-freebsd-arm@FreeBSD.ORG Wed Jun 13 03:56:44 2007 Return-Path: X-Original-To: arm@freebsd.org Delivered-To: freebsd-arm@FreeBSD.ORG Received: from mx1.freebsd.org (mx1.freebsd.org [69.147.83.52]) by hub.freebsd.org (Postfix) with ESMTP id A5B1F16A46B for ; Wed, 13 Jun 2007 03:56:44 +0000 (UTC) (envelope-from imp@bsdimp.com) Received: from harmony.bsdimp.com (bsdimp.com [199.45.160.85]) by mx1.freebsd.org (Postfix) with ESMTP id 5FFEF13C45E for ; Wed, 13 Jun 2007 03:56:44 +0000 (UTC) (envelope-from imp@bsdimp.com) Received: from localhost (localhost [127.0.0.1]) by harmony.bsdimp.com (8.13.8/8.13.4) with ESMTP id l5D3s430068939; Tue, 12 Jun 2007 21:54:04 -0600 (MDT) (envelope-from imp@bsdimp.com) Date: Tue, 12 Jun 2007 21:54:30 -0600 (MDT) Message-Id: <20070612.215430.-365729166.imp@bsdimp.com> To: bkoenig@alpha-tierchen.de From: "M. Warner Losh" In-Reply-To: <55286.2001:6f8:101e:0:20e:cff:fe6d:6adb.1181705783.squirrel@webmail.alpha-tierchen.de> References: <55286.2001:6f8:101e:0:20e:cff:fe6d:6adb.1181705783.squirrel@webmail.alpha-tierchen.de> X-Mailer: Mew version 5.2 on Emacs 21.3 / Mule 5.0 (SAKAKI) Mime-Version: 1.0 Content-Type: Text/Plain; charset=iso-8859-1 Content-Transfer-Encoding: quoted-printable X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-2.0 (harmony.bsdimp.com [127.0.0.1]); Tue, 12 Jun 2007 21:54:04 -0600 (MDT) Cc: arm@freebsd.org Subject: Re: main clock frequency X-BeenThere: freebsd-arm@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Porting FreeBSD to the StrongARM Processor List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 13 Jun 2007 03:56:44 -0000 In message: <55286.2001:6f8:101e:0:20e:cff:fe6d:6adb.1181705783.squirre= l@webmail.alpha-tierchen.de> Bj=F6rn_K=F6nig writes: : Hello, : = : in at91_pmc_attach you're assume a certain main clock frequency. Isn'= t it : reasonable to read this value from the main clock frequency register = if it : is available? : = : I mean something like : = : uint32_t mcfr =3D RD4(pmc_softc, CKGR_MCFR); : if (mcfr & CKGR_MCFR_MAINRDY) : at91_pmc_init_clock(pmc_softc, (mcfr & CKGR_MCFR_MAINF_MASK) * 3276= 8 / 16); : else : /* fallback or error */ Yes. I think that's reasonable. I didn't do it because I didn't think of it at the time I wrote the code. Warner