USB, IOAPIC and IRQ routing

Petr Vandrovec Ing. VTEI (VANDROVE@vc.cvut.cz)
Tue, 3 Aug 1999 23:51:10 MET-1

Hi,
today, HP's USB scanner arrived to my table. This caused me to try to use
USB - and I found, that my BIOS does not fill IRQ routing part of MPTABLE
correctly - it forgot to add PCI slot 7, pin 3 -> IOAPIC#2, pin 19
entry into MPTABLE, only slot 7, pin 0 is there, with mapping to pin 19
(which is probably incorrect, no one acquires pin 0 on PIIX4) :-(
This causes that IO_APIC_get_PCI_irq_vector will not find any mapping,
so -1 is returned and (pci) dev->irq is left to 10, instead of correct 19.
For this moment, I hardwired this mapping into bios32.c, as I did not
find any way how to pass this from commandline.
So, finally, my question is - is it only my BIOS/board broken and I should
shut up and complain to vendor, or are these problems common and some
commandline argument for kernel should exist (so I have to write generally
usable patch)?
Best regards,
Petr Vandrovec
vandrove@vc.cvut.cz

P.S.: Is there anybody getting HP ScanJet 6250C to work under Linux
(either over SCSI or USB) (I have to get it to work before Y2K)? Or have I
to upgrade my Win95 to Win98 and connect scanner to Windoze?

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