From mboxrd@z Thu Jan 1 00:00:00 1970 From: Frans Pop Subject: Re: [regression] sata_mv: harddisk activity led no longer responsive on QNAP TS-109 Date: Fri, 29 Aug 2008 00:40:06 +0200 Message-ID: <200808290040.08447.elendil@planet.nl> References: <200808261045.33241.elendil@planet.nl> <200808282043.46032.elendil@planet.nl> Mime-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Return-path: Received: from cpsmtpo-eml03.kpnxchange.com ([213.75.38.152]:59844 "EHLO cpsmtpo-eml03.kpnxchange.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754043AbYH1WkL (ORCPT ); Thu, 28 Aug 2008 18:40:11 -0400 In-Reply-To: Content-Disposition: inline Sender: linux-ide-owner@vger.kernel.org List-Id: linux-ide@vger.kernel.org To: saeed bishara Cc: Lennert Buytenhek , linux-arm@vger.kernel.org, linux-ide@vger.kernel.org, Mark Lord , Nicolas Pitre On Friday 29 August 2008, saeed bishara wrote: > > $ sudo devmem2 0xf108002c w 1 > > /dev/mem opened. > > Memory mapped at address 0x4001f000. > > Value at address 0xF108002C (0x4001f02c): 0x0 > > Written 0x1; readback 0x1 > > > > After that the HDD led does react again to io activity. > > do you mean it's blinking on io activity? Yes. > is it off when no io running? No. It is on when there is no activity, but that is how it has always been. Same as the LAN led which is also always on when there is a connection and blinks on activity. I don't know if that's how that's intended, but IMHO it makes sense for an embedded device to have the led on by default to show the device is "present and recognized" and to blink when there is activity. Cheers, FJP