[Bug 208308] Adding USB flash drive to fstab kills ue0 on Raspberry Pi 2

[Ian Lepore]

On Sat, 2016-03-26 at 11:07 -0700, bob prohaska wrote:
> I'd like to confirm mischief when trying to add a flash device to
> /etc/fstab,
> though the symptoms I observed were slightly different. I'm using the
> latest
> snapshot, I think it's dated March 8.
> 
> After adding a /usr partition to /etc/fstab and rebooting it appeared
> that
> the system was trying to mount filesystems before /dev was populated,
> reporting
> that the device file wasn't found and going to single-user. Once in
> single-user,
> the device file existed and could be mounted. Attempts to add a
> "late" option
> didn't seem to help, eventually I gave up and rewrote the image to
> start over,
> thinking I'd made a mistake. Maybe not....or else I have company 8-)
> Unfortunately
> I didn't save the console messages.
> 
> 
> This bug report seems to imply use of the video console, and IIRC, I
> saw
> the same output on the monitor, though I wasn't paying close
> attention 
> to it.
> 
> The system is now running buildworld of R297293 using hand-mounted
> /usr
> and swap. It's on the same SanDisk Extreme 32 GB flash drive. If
> there's
> a particular snapshot or revision that's worth trying please post.
> 
> Thanks for reading,
> 
> bob prohaska

Normally the boot process waits only for the root filesystem device to
appear.  You might try adding an unconditional boot delay to
/boot/loader.conf, to give time for usb devices to arrive, like

 kern.cam.boot_delay="10000"

The number is delay in milliseconds.

-- Ian