Messages in this thread | | | Subject | Re: [linux-usb-devel] USB shared interrupt problem | From | Alan Cox <> | Date | Sat, 07 Aug 2004 23:21:41 +0100 |
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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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