Welcome to OS2.GURU site! (eComStation.RU)

• don't set own restrictions to high IRQs > IRQ15
• read information about IRQ from PCI Config Space or from acpi.psd

How to create driver ready for SMP and APIC mode?

• Use DevEOI helper only (DevHlp_EOI), DON'T USE OUT 20h,20h

More suggestions:

• If you are going use IRQ before INIT_COMPLETE then use PIC IRQ before, APIC IRQ after. Query the information using FindPCIDevice()

APM:

• when you init the adapter, look at D-state in PCI, if the adapter is in D-state (i.e. D-state != 0) then enable it. Else the devices don't work if computer was suspended by Windows.

We looked into the acpitree output to find the com port of the digitizer.

+*DTR_ T:[Device] HID:[WACF004] STA:[0xd] SxD State:[0xff:ff:ff:ff]
Current state:
> IO:[1 0x200 - 0x200 Al:1 Len:8]
>Trigger by Edge, Polarity High IRQ-4
> ENDTAG

thx Wim Brul