Strange problem: if_xe only works in GENERIC kernel

[M. Warner Losh]

In message: <201003190837.48346.jhb at freebsd.org>
            John Baldwin <jhb at FreeBSD.org> writes:
: On Thursday 18 March 2010 3:27:58 pm Joerg Wunsch wrote:
: > I'm running into a strange problem with 8-current (or 8.0-RELEASE) on
: > an elderly Thinkpad 600E.
: > 
: > As long as I'm using the GENERIC kernel, an Intel Etherexpress PC card
: > works as expected:
: > 
: > interrupt storm detected on "irq11:"; throttling interrupt source
: > xe0: <Intel EtherExpress(TM) PRO/100 PC Card Mobile Adapter16> at port 
: 0x100-0x10f iomem 0x20000000-0x20000fff irq 11 function 0 config 1 on pccard1
: > xe0: version 0x45/0x04, 100Mbps capable
: > xe0: Ethernet address: 00:a0:c9:bc:b5:ef
: > xe0: [ITHREAD]
: > 
: > However, as soon as I start removing unneeded stuff from the kernel
: > config file, the driver completely jams.  It just sits there, the
: > machine blocks, until I eventually pop out the card, when I get the
: > following messages:
: > 
: > cbb1: ready never happened, status = 00
: > xe0: <Intel EtherExpress(TM) PRO/100 PC Card Mobile Adapter16> at port 
: 0x100-0x10f iomem 0x20000000-0x20000fff irq 11 function 0 config 1 on pccard1
: > xe0: version 0xff/0x07, 100Mbps capable
: > xe0: Ethernet address: 00:a0:c9:bc:b5:ef
: > xe0: [ITHREAD]
: > xe0: detached
: > cbb1: Bad Vcc requested
: > 
: > As the CPU is a little slow, recompiling kernels takes an eternity on
: > it (even with NO_KERNELCLEAN), so I could not isolate it to a single
: > line in the config file so far.
: 
: Sounds like the process of removing things prevented the interrupt storm from 
: being throttled somehow, and that ejecting the card caused the interrupt storm 
: to finally stop at which point the card was probed.  I would talk to Warner 
: (imp@) about trying to fix the interrupt storm.  Also, if you could narrow 
: down which particular item that you trim "breaks" it, that would be helpful.

Yes.  Do other cards cause this same problem?  The cbb1: Bad Vcc is a
big clue something is going wrong with the bridge, not the card.

Warner