Re: new usb stack - boot problem from usb hdd

On Sat, Apr 18, 2009 at 07:31:25AM +1000, Greg 'groggy' Lehey wrote:
> On Friday, 17 April 2009 at 18:44:27 +0400, Alex Keda wrote:
> > After boot, before mount, disk da0 lost, or some partition
> > lost/uninitialised
> >
> > ...
> > umass0:0:0:-1: Attached to scbus0
> > da0 at umass-sim0 bus 0 target 0 lun 0
> > da0: <Hitachi HTS541680J9SA00 > Fixed Direct Access SCSI-2 device
> > da0: 40.000MB/s transfers
> > da0: 76319MB (156301488 512 byte sectors: 255H 63S/T 9729C)
> > Trying to mount root from ufs:/dev/da0s1a
> >
> > Manual root filesystem specification:
> >  <fstype>:<device>  Mount <device> using filesystem <fstype>
> >                       eg. ufs:da0s1a
> >  ?                  List valid disk boot devices
> >  <empty line>       Abort manual input
> 
> FWIW, I'm experiencing a similar problem with a USB stick.  I get an
> error 2 on the device entry (also /dev/da0s1a), followed by a panic
> with an incomplete stack backtrace.  I'm going to try remote debugging
> to get more information; watch this space.

There's a thread from a few days ago regarding this with a subject of
"Booting from usb hard disk".  There is a patch that allows me to boot,
but there are still problems (I have to select usb:da0s1a at the manual
root filesystem prompt still.)

  http://people.freebsd.org/~thompsa/root_wait.diff

This was committed but then backed out as a less-than-perfect solution.
Someone said that setting kern.cam.scsi_delay=10000 in loader.conf (or
with option 6 at the boot prompt) helped them, but that was not the
case for me.

Marcus