device hint -> disable firewire or sbp driver

Chris Whitehouse cwhiteh at
Sat Nov 21 18:25:10 UTC 2009

Tim Judd wrote:
> Any way via tunables, environment, sysctl or device hints that one can
> disable firewire on the install medium of recent (7.2 and newer)
> Install CD/DVDs?
> more than one person is having problems with kernel panics on startup
> due to firewire, and I can't google my way out of this one.
> Any advice from the pros?
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I've got one of the affected motherboards if this is the problem you mean:

The things that have worked for me are disabling firewire in the BIOS 
and using a GENERIC kernel or building a kernel with device sbp disabled 
and having firewire enabled in the BIOS.

hint.sbp.0.disabled="1" in /boot/device.hints with GENERIC kernel - 
still get a panic

sbp_load="YES" in /boot/loader.conf with sbp disabled in the kernel - 
get panic.

It seems ok to kldload sbp after the system is up, ie the machine 
doesn't panic, but I don't have anything firewire to test with.

Would it be an option to have sbp disabled by default in the install 
CD's? Those without the problem can put sbp_load in loader.conf, those 
with the problem will have to kldload it later but at least they will be 
able to install.

FreeBSD eco.config 8.0-RC2 FreeBSD 8.0-RC2 #1: Thu Oct 29 14:04:02 GMT 
2009     root at eco.config:/usr/obj/usr/src/sys/GENERIC_NO_SBP  i386


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