Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751227AbWJLW3W (ORCPT ); Thu, 12 Oct 2006 18:29:22 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751226AbWJLW3W (ORCPT ); Thu, 12 Oct 2006 18:29:22 -0400 Received: from ug-out-1314.google.com ([66.249.92.169]:30049 "EHLO ug-out-1314.google.com") by vger.kernel.org with ESMTP id S1751221AbWJLW3V (ORCPT ); Thu, 12 Oct 2006 18:29:21 -0400 DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws; s=beta; d=gmail.com; h=received:message-id:date:from:to:subject:cc:mime-version:content-type; b=YYRH8j0sPnFnKRZZ7yNpYbz8QPRV8sJyg9048RtYeFWJOz4ja+yVgJU/vP4hqIQCnrWnIucvtUFnwJ2fXggHsnJDx3klikmkg3tD8oBmBAfXMb+hkieY+eRfdxaddYUUrszpgBTrIOcKA8U3j6whsCJ/nzIELqYpm0ftEkODZC4= Message-ID: Date: Thu, 12 Oct 2006 15:29:19 -0700 From: "Zhao Forrest" To: robert.picco@hp.com Subject: HPET char device can't work in 2.6.18 Cc: linux-kernel@vger.kernel.org MIME-Version: 1.0 Content-Type: multipart/mixed; boundary="----=_Part_73733_30041524.1160692159592" Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 9204 Lines: 144 ------=_Part_73733_30041524.1160692159592 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Content-Disposition: inline Hi Robert, After 2.6.18 booted on my machine, there's a device file for hpet: /dev/hpet.But when I read this device file, I got the error: cat: /dev/hpet: Input/output error In dmesg, I found some error messages related to hpet: hpet_resources: 0xfed00000 is busy hpet_acpi_add: no address or irqs in _CRS Also there're some not-error-messages about hpet: time.c: Using 25.000000 MHz WALL HPET GTOD HPET timer. time.c: Detected 2613.696 MHz processor. ........ hpet0: at MMIO 0xfed00000 (virtual 0xffffffffff5fe000), IRQs 2, 8, 31 hpet0: 3 32-bit timers, 25000000 Hz I guess maybe there's only one hpet timer in system, so after kernel use one, the hpet char device driver can't find a free hpet timer anymore. Am I right? The full dmesg is attached. 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