USB2: umass not detected correctly, axe not transmitting

[Alfred Perlstein]

* M. Warner Losh <imp at bsdimp.com> [090211 15:37] wrote:
> In message: <20090211225701.GL68801 at elvis.mu.org>
>             Alfred Perlstein <alfred at freebsd.org> writes:
> : * Hans Petter Selasky <hselasky at c2i.net> [090211 00:52] wrote:
> : > Hi,
> : > 
> : > On Wednesday 11 February 2009, Hiroharu Tamaru wrote:
> : > > Hi,
> : > >
> : > > I have an Atom Z530 semi-embedded system and tried the new USB2 stack.
> : > > I found some oddities and decided to report here.
> : > >
> : > > It is running 8.0-CURRENT as of yesterday, and I have GENERIC and USB2
> : > > kernels to test with.  I am testing with two usb devices:
> : > >
> : > > umass0: <JetFlash Mass Storage Device, class 0/0, rev 2.00/1.00, addr 2> on
> : > > usbus3 axe0: <ASIX Electronics AX88178, rev 2.00/0.01, addr 3> on usbus3
> : > >
> : > > First about the USB memory stick:
> : > >
> : > > 1) I setup a bootable USB memory stick, and this system
> : > >    boots off umass da0 if I have the old USB1 kernel.
> : > >    However, with USB2 kernel, it does not detect da0 at its final stage,
> : > >    and fails to find the root filesystem.
> : > >    I mean that the 'da0 at umass-sim0 bus 0 target 0 lun 0' message is not
> : > >    shown, and it is not listed in the kernel detected list of disks at
> : > >    'mountroot>' prompt (shown by typing '?').
> : > 
> : > This is a known issue, see:
> : > 
> : > http://wiki.freebsd.org/USB
> : 
> : Is this the "delay in mountroot patch"?  If so, I think it should go
> : in.  Can you send to Andrew for commit?  If he's not available, please
> : remind me to commit it.
> 
> That patch needs comments that say it is a workaround because we don't
> have a way to signal the mountroot code that all my configuration is
> done.  This is a problem for all hot-plug technologies...
> 
> but other than a comment, I'm cool with that patch going in.

Agreed.  Will do.

-- 
- Alfred Perlstein