uhci and uninitialized usb controller

Davide Rossetti (davide.rossetti@roma1.infn.it)
Sun, 28 Nov 1999 18:12:44 +0100

hi,
just to be silly:
on my bi-processor PII, ASUS board, in case I disable IRQ assigning in
BIOS (it was so to prevent SCSI and USB from sharing the IRQ), I get
(Linux 2.3.28):
a) SMP kernel: EBUSY at insmod time as in uhci.c
...
retval = -EBUSY;
if (request_irq(irq, uhci_interrupt, SA_SHIRQ, "uhci", uhci) == 0) {
...

doesn't check uhci_interrupt.

b) UP kernel: seems someone (the pci stuff in the kernel ?) activates
and IRQ-assigns the USB interface anyway.

my setup, with USB IRQ activated in the BIOS:
00:04.2 USB Controller: Intel Corporation 82371AB PIIX4 USB (rev 01)
Control: I/O+ Mem- BusMaster+ SpecCycle- MemWINV- VGASnoop-
ParErr- Step
ping- SERR- FastB2B-
Status: Cap- 66Mhz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort-
<TAbort- <MAbort- >SERR- <PERR-
Latency: 32 set
Interrupt: pin D routed to IRQ 9
Region 4: I/O ports at d400

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|Rossetti Davide   INFN - Sezione Roma I - gruppo V, prog. APEmille|
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