Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755325Ab2JBW7y (ORCPT ); Tue, 2 Oct 2012 18:59:54 -0400 Received: from tx2ehsobe003.messaging.microsoft.com ([65.55.88.13]:23250 "EHLO tx2outboundpool.messaging.microsoft.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755240Ab2JBW7w (ORCPT ); Tue, 2 Oct 2012 18:59:52 -0400 X-Forefront-Antispam-Report: CIP:160.33.194.230;KIP:(null);UIP:(null);IPV:NLI;H:usculsndmail03v.am.sony.com;RD:mail03.sonyusa.com;EFVD:NLI X-SpamScore: -5 X-BigFish: VPS-5(zzbb2dI98dI9371I1432I111aIzz1202h1d1ah1d2ahzz8275bhz2fh2a8h668h839h93fhd25hf0ah107ah1288h12a5h12a9h12bdh137ah13b6h1441h1155h) Message-ID: <506B70C7.6080001@am.sony.com> Date: Tue, 2 Oct 2012 15:55:03 -0700 From: Tim Bird User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:15.0) Gecko/20120827 Thunderbird/15.0 MIME-Version: 1.0 To: Robert Nelson CC: "linux-arm-kernel@lists.infradead.org" , linux kernel Subject: Re: Problem with mmc DMA on panda board in 3.6 References: <506B69B0.2010109@am.sony.com> In-Reply-To: Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 7bit X-OriginatorOrg: am.sony.com Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2843 Lines: 73 On 10/02/2012 03:28 PM, Robert Nelson wrote: > On Tue, Oct 2, 2012 at 5:24 PM, Tim Bird wrote: >> This is an early report - I'm just checking if anyone else has seen this. >> >> With Linux version v3.6, my PandaBoard (OMAP-based) no longer boots. The >> system appears to fail to initialize the mmc controller. >> >> The kernel log message of interest appears to be this: >> [ 1.690002] omap_hsmmc omap_hsmmc.0: unable to obtain RX DMA engine channel 6 >> >> I can supply full kernel log messages and my .config if needed. >> >> I bisected the code and arrived at the following commit: >> ------- >> commit 26b88520b80695a6fa5fd95b5d97c03f4daf87e0 >> Author: Russell King >> Date: Fri Apr 13 12:27:37 2012 +0100 >> >> mmc: omap_hsmmc: remove private DMA API implementation >> >> Remove the private DMA API implementation from omap_hsmmc, making it >> use entirely the DMA engine API. >> >> Tested-by: Tony Lindgren >> Tested-by: Venkatraman S >> Signed-off-by: Russell King >> ------- >> The board works up until this commit. >> After this commit, the board hangs during boot after the message: >> [ 1.852508] Waiting for root device /dev/mmcblk0p3... >> (and some other USB and network messages, which I presume >> are unrelated.) >> >> My questions are these: >> Has anyone else had problems with the PandaBoard (or other OMAP) on 3.6? >> Are there any related CONFIG_ variables I could change to try alternatives? >> What should I try next to debug this? > > Check your config, to see if these are enabled: > > CONFIG_DMADEVICES=y > CONFIG_DMA_OMAP=y They were not. After enabling them, things work as expected. Thanks very much!! :-) I've been doing the following on a mainline kernel to generate the .config for my panda board: make omap2plus_defconfig ttc set_config CONFIG_USB_EHCI_HCD=y CONFIG_MFD_OMAP_USB_HOST=y CONFIG_USB_EHCI_ROOT_HUB_TT=N CONFIG_USB_EHCI_TT_NEWSCHED=y CONFIG_USB_EHCI_HCD_OMAP=y CONFIG_USB_EHCI_MV=n ttc set_config CONFIG_USB_NET_SMSC95XX=y CONFIG_USB_SISUSBVGA=n make oldconfig I've kind of lost track of the preferred method of doing board-specific configurations, since the big defconfig purge of 2011. I think I need to go back to the drawing board on my automatic config-setting. In any event, thanks again. -- Tim ============================= Tim Bird Architecture Group Chair, CE Workgroup of the Linux Foundation Senior Staff Engineer, Sony Network Entertainment ============================= -- 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/