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SubjectRe: [linux-usb-devel] USB shared interrupt problem
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On Gwe, 2004-08-06 at 21:42, Pete Zaitcev wrote:
> I have a patch which prevents SMM BIOS from doing this to us
> by requesting unconditional handoff (it comes from Vojtech @SuSE,
> modified by John Stulz from IBM for 2.4). However, if you have a "normal"
> BIOS doing this, I'm a little lost as to what to do. It can still honor
> the handoff, if you're lucky.

In SMM mode the USB controller isn't connected to the PCI IRQ line. That
is one thing that is done in the changeover. It also seems to be causing
problems with EHCI hand over on NVidia boards still.

BTW the patch wants extending by someone to cover EHCI - modern boards
are doing EHCI USB legacy now.

Alan

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