From mboxrd@z Thu Jan 1 00:00:00 1970 From: Tejun Heo Subject: Re: AHCI driver prints "D2H reg with I during NCQ" message, what is it? Date: Sat, 14 Jul 2007 13:12:22 +0900 Message-ID: <46984D26.5080807@gmail.com> References: <46979A3A.2090005@redhat.com> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Return-path: Received: from py-out-1112.google.com ([64.233.166.177]:17235 "EHLO py-out-1112.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750966AbXGNEMb (ORCPT ); Sat, 14 Jul 2007 00:12:31 -0400 Received: by py-out-1112.google.com with SMTP id d32so1163151pye for ; Fri, 13 Jul 2007 21:12:30 -0700 (PDT) In-Reply-To: <46979A3A.2090005@redhat.com> Sender: linux-ide-owner@vger.kernel.org List-Id: linux-ide@vger.kernel.org To: Chuck Ebbert Cc: IDE/ATA development list Chuck Ebbert wrote: > I see this on boot with kernels 2.6.22.1 and 2.6.20.15: > > ata1: D2H reg with I during NCQ, this message won't be printed again > > But I can't find anything that tells me what it means, or whether > it's a real problem. That's your firmware transmitting unnecessary D2H Reg FIS during NCQ command phase. It's minor protocol violation which can be ignored. No need to worry. -- tejun