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From: Gavin Atkinson <gavin@FreeBSD.org>
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Subject: Re: problem with iwi driver in 8.0 and custom kernel (works on
 generic)
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On Wed, 23 Dec 2009, ocean wrote:
> i've got some problems with iwi in Freebsd 8.0, using GENERIC kernel
> everything works just fine, compiling a custom kernel, just excluding some
> modules i don't need, cause an interrupt storm to happen on irq11:
> 
> Dec 22 22:35:18 legend kernel: iwi0: <Intel(R) PRO/Wireless 2200BG> mem
> 0xb0101000-0xb0101fff irq 10 at device 4.0 on pci6
> Dec 22 22:35:18 legend kernel: iwi0: [ITHREAD]
> Dec 22 22:35:22 legend kernel: wlan0: Ethernet address: xx:xx:xx:xx:xx:xx
> Dec 22 22:35:32 legend kernel: interrupt storm detected on "irq11:";
> throttling interrupt source
> Dec 22 22:35:33 legend kernel: iwi0: timeout waiting for iwi_bss firmware
> initialization to complete
> Dec 22 22:35:33 legend kernel: iwi0: could not load boot firmware iwi_bss

Before you recompiled, did the iwi0 device work?  Once booted, can you 
show the output of "vmstat -i"?  Also, can you post a verbose dmesg 
somewhere?

It might also be useful to re-add things back into the kernel, and figure 
out which device removal actually triggers this.

Gavin