On 10/02/2012 03:28 PM, Robert Nelson wrote: > On Tue, Oct 2, 2012 at 5:24 PM, Tim Bird <tim.b...@am.sony.com> 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 <rmk+ker...@arm.linux.org.uk> >> 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 <t...@atomide.com> >> Tested-by: Venkatraman S <svenk...@ti.com> >> Signed-off-by: Russell King <rmk+ker...@arm.linux.org.uk> >> ------- >> 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 majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
