Mathieu Poirier <mathieu.poir...@canonical.com> wrote: > HW: Beagleboard rev. C2 and C4 > Processor: OMAP3 > Kernel: 2.6.35-rc2 > Driver: mmci-omap-hs > > I am faced with an SDHC card problem on a beagleboard. Some cards > cannot be initialized on startup while others work perfectly. I tracked > the issue down to one single kernel config: PREEMPT_VOLUNTARY. > > When going from PREEMPT_VOLUNTARY to PREEMPT_NONE the problem goes away. > > When booting, a failing card (PREEMPT_VOLUNTARY) will output the > following: > [ 2.283355] mmc0: error -110 whilst initialising SD card > > I have also seen transfer errors such as this one: > [ 105.343780] mmcblk0: error -110 transferring data, sector 798431, nr > 26, card status 0xc00 > > When working properly (PREEMPT_NONE), you get: > [ 27.026519] mmc0: new high speed SDHC card at address 0007 > [ 27.075775] mmcblk0: mmc0:0007 SD08G 7.49 GiB > > We seem to have a little timing problem - has anyone seen the same > issue ? Can driver "mmci-omap-hs" actually work under > PREEMPT_VOLUNTARY ? > > Thanks, Mathieu. >
I will check this out - not tested with PREEMPT_VOLUNTARY so far. If it's not too much trouble, can you provide a log with CONFIG_MMC_DEBUG ? Also, some details about the failing card would be helpful. Thanks, Venkat. -- To unsubscribe from this list: send the line "unsubscribe linux-omap" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
