Re: rootfs on USB storage device

Jos Nouwen
2001-11-16T02:32:50Z

On Wed, 14 Nov 2001, Greg KH wrote:

> On Thu, Nov 15, 2001 at 04:22:33AM +0100, Jos Nouwen wrote:
> >
> > Does anybody have a clue as to what the USB bus has to do with
> > /dev/console?
>
> It's a timing issue, and has nothing to do with /dev/console. If you
> sit and spin before you try to mount the root fs, the USB subsystem will
> have enough time to find the drive. There's a few patches that do this
> in the lkml archives.
>
> thanks,
>
> greg k-h

It does not seem so. I included several seconds of mdelay() (and lots of
printk()'s) while I was debugging, and that didnt change a thing. I added
a.o. 4 seconds of mdelay() right before the open(), and 2 seconds right
after the open() and the two dup()'s. The storage device was detected at
the beginning of that last delay. Me thinks this is related to the open().
I added a total of 10 seconds of mdelay() between do_basic_setup() (where
the usb is initialized) and the open(). That is much more time than it
takes to init the USB storage device.