USB problem - how to disable an umass device?
olli at lurza.secnetix.de
Wed Mar 7 13:09:41 UTC 2007
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
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.
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