Messages in this thread | | | Date | Sun, 15 Oct 2006 11:40:31 +0200 | From | "pHilipp Zabel" <> | Subject | Re: [PATCH] [MMC] Use own work queue |
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On 10/13/06, Russell King <rmk+lkml@arm.linux.org.uk> wrote: > On Mon, Oct 09, 2006 at 11:04:59PM +0200, Pierre Ossman wrote: > > pHilipp Zabel wrote: > > > > > > This patch makes pxamci stop working for me on a HTC Magician (PXA272). > > > Switching from 2.6.18 to 2.6.19-rc1 I got a kernel panic: > > > > > > mmc0: clock 0Hz busmode 1 powermode 0 cs 0 Vdd 0 width 0 > > > PXAMCI: clkrt = 0 cmdat = 0 > > > VFS: Cannot open root device "mmcblk0p2" or unknown-block(0,0) > > > Please append a correct "root=" boot option > > > Kernel panic - not syncing: VFS: Unable to mount root fs on > > > unknown-block(0,0) > > > > > > After removing this patch from 2.6.19-rc1, everything is working again. > > > Are there any changes to pxamci.c needed to be compatible with it? > > > > > > > No, the drivers shouldn't be affected. As this is a root device, my > > guess would be that you have a race in your bootup that is causing problem. > > The problem is likely that the boot is continuing in parallel with > detecting the card, because the card detection is running in its own > separate thread. Meanwhile, the init thread is trying to read from > the as-yet missing root device and erroring out.
Thanks, I can work around this by using the rootdelay kernel parameter. So does that mean this is the expected behavior, or should I do anything in the bootup sequence to make the init process wait for mmc detection?
regards Philipp - 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/
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