4.9-R panic with Lava DSerial-PCI 3.3v and device puc

[Bruce Evans]

On Fri, 9 Apr 2004, Michael Wang wrote:

> Since I could not get the Lava DSerial-PCI 3.3v
> dual port serial card to work under 4.9-R. I upgraded
> the FreeBSD to 5.2.1-R. Here is the new info.

Looks like the interrupt configuration is still broken.  Yesterday's
changes to pci configuration may help.

[... many details deleted.  Reply to the original if you have more
comments on it.]

> (1) Boot message
>
> On 5.2.1-R, it did not panic (on 4.9-R, it paniced),
> The verbose boot message shows:
>
>   ...
>   pci3: <ACPI PCI bus> on pcib2
>   pci3: physical bus=3
>           map[10]: type 4, range 32, base 0000ccf8, size  3, port disabled
>   found-> vendor=0x1407, dev=0x0110, revid=0x00
>           bus=3, slot=6, func=0
>           class=07-00-02, hdrtype=0x00, mfdev=1
>           cmdreg=0x0040, statreg=0x0480, cachelnsz=0 (dwords)
>           lattimer=0x00 (0 ns), mingnt=0x00 (0 ns), maxlat=0x00 (0 ns)
>           intpin=a, irq=255
>           map[10]: type 4, range 32, base 0000ccf0, size  3, port disabled
>   found-> vendor=0x1407, dev=0x0111, revid=0x00
>           bus=3, slot=6, func=1
>           class=07-00-02, hdrtype=0x00, mfdev=1
>           cmdreg=0x0040, statreg=0x0480, cachelnsz=0 (dwords)
>           lattimer=0x00 (0 ns), mingnt=0x00 (0 ns), maxlat=0x00 (0 ns)
>           intpin=a, irq=255
>   puc0: <Lava Computers serial port> port 0xccf8-0xccff at device 6.0 on pci3
>   pcib2: matched entry for 3.6.INTA (source )
>   pcib2: device is hardwired to IRQ 24
>   puc0: failed to enable port mapping!
>   puc0: could not get resource
>   puc1: <Lava Computers serial port> port 0xccf0-0xccf7 at device 6.1 on pci3
>   pcib2: matched entry for 3.6.INTA (source )
>   pcib2: device is hardwired to IRQ 24
>   puc1: failed to enable port mapping!
>   puc1: could not get resource
>   ...
>
> My reading is on pci3, it found two devices (two ports).
>
> Here are things that I doubt:
>
> (a) The "irq=255" does not look right. And later it says
> "device is hardwired to IRQ 24".

I think 255 is the correct value for "irq not there" (not sure).  I
don't understand the hardwired part.

> (b) And I do not know why port disabled.

The port enable bit is read from the devices's pci registers like the
irq value, and it is not set.  So the BIOS is apparently disabling the
device.

> (c) I also do not understand "size 3". The
> base address are 0000ccf0-0000ccf7 and 0000ccf8-0000ccff.
> The size should be 8, shouldn't it?

The size is in bits: 2^3 = 8.

Bruce