freebsd stable - Mar 2007 - USB problem - how to disable an umass device?

I'm trying to install 6.2-release on an IBM blade center blade (AMD
Opteron), but the boot process hangs while accessing an embedded USB
storage device umass1. Since I don't think I'll ever need it, and I need
the blade, is there any way to disable probing or usage of umass1? I
think the problems arrive when FreeBSD tries to attach "da" device to
it.

Alternatively, I can try disabling parts of the USB "chain", since
umass1 is connected to uhub1 which is connected to usb2, but how? (I
cannot disable USB in general because internal keyboard is attached to it)

I tried using loader hint hint.usb.2.disabled="1" but it doesn't
work.


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Ivan Voras wrote:
 > I'm trying to install 6.2-release on an IBM blade center blade (AMD
 > Opteron), but the boot process hangs while accessing an embedded USB
 > storage device umass1. Since I don't think I'll ever need it, and
I need
 > the blade, is there any way to disable probing or usage of umass1? I
 > think the problems arrive when FreeBSD tries to attach "da"
device to it.

I'm afraid the only way is to compile a custom kernel that
does not have "device umass".  You might also have to make
sure there's no umass.ko in /boot/kernel (I'm not sure, but
it's possible that some mechanism like devd tries to load
umass.ko automatically).

Of course, a better way to solve the problem would be to
find out _why_ it is hanging in the first place.  :-)
The first step would be to enter the kernel debugger and
take a stack trace, in order to find out where it is stuck.

It might be a good idea to take this issue to the freebsd-
usb mailing list.

 > I tried using loader hint hint.usb.2.disabled="1" but it
doesn't work.

Unfortunately, hints cannot be used to disable devices in
general (which would be a desirable feature).  That only
works for legacy devices (i.e. ISA) and some others.

Best regards
   Oliver

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(On the statement print "42 monkeys" + "1 snake":)  By the
way,
both perl and Python get this wrong.  Perl gives 43 and Python
gives "42 monkeys1 snake", when the answer is clearly "41 monkeys
and 1 fat snake".        -- Jim Fulton