Messages in this thread | | | Date | Mon, 23 May 2011 13:33:55 -0400 (EDT) | From | Alan Stern <> | Subject | Re: USB stick as root device does not work |
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On Mon, 23 May 2011, Randy Dunlap wrote:
> [adding cc: of linux-usb mailing list]
Better to ask people familiar with the block layer (CC'ed).
Alan Stern
> On Sun, 22 May 2011 16:13:17 +0200 Micha Nelissen wrote: > > > Hi, > > > > Using USB stick as root device does not work for me. I specify > > 'root=/dev/sdb1 rootwait' on the kernel commandline, but the kernel does > > not wait for the USB stick to be scanned and its partitions found. I > > have a harddisk which is /dev/sda, and this USB stick would be /dev/sdb. > > > > I think blk_lookup_devt returns the block device number even if it does > > not exist yet, and init/do_mounts.c:473 therefore skips waiting: > > > > if ((ROOT_DEV == 0) && root_wait) { > > > > due to ROOT_DEV having become non-zero already. > > > > If I use the commandline: 'root=/dev/sdb1 rootdelay=5' then it does > > mount and boot properly. However, using rootwait seems safer and faster > > to me, that it's meant for this use case. > > > > Thanks for any pointers, > > > > Micha > > -- > > --- > ~Randy > *** Remember to use Documentation/SubmitChecklist when testing your code ***
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