PING: Someone on the core team. (Modem Problem)

Fri Feb 9 18:23:02 UTC 2007

At about the time of 2/9/2007 3:05 AM, Peter Jeremy stated the following:

> I'm not on the core team but I'm not sure why you believe that
> this has anything to do with core.
> 

This very much does involve core because I plan on handing the modem,
and the entire computer if necessary, over to a core developer so they
can figure out why it doesn't work and correct the problem, if they can.
 I am serious about getting this issue resolved because I'm under the
gun myself.  Furthermore, I don't have nearly the required knowledge of
how the kernel does things to even attempt to resolve the issue on my own.

> On 2007-Feb-09 00:16:31 -0800, Daniel Rudy <dr2867 at pacbell.net> wrote:
>> sio0: configured irq 19 not in bitmap of probed irqs 0
>> sio0: port may not be enabled
>> sio0: <Lucent kermit based PCI Modem> port
>> 0xdc00-0xdcff,0xe000-0xe0ff,0xe400-0xe407 mem 0xeb107000-0xeb1070ff
>> irq 19 at device 11.0 on pci0
>> sio0: type 16550A
> 
> Is this device visible in the BIOS and if so, what does the BIOS
> say its configuration is.  The dmesg from a verbose boot may be
> useful.  The "port may not be enabled" line looks to be the most
> relevant one.

The modem is PCI, and there is no facility in the BIOS to display what
cards are in the system.  Furthermore, the irq mapping shows irq 3-15,
irq 17, 18, and 19 do not show on the list.  Below is the full dmesg
from the boot:

Copyright (c) 1992-2007 The FreeBSD Project.
Copyright (c) 1979, 1980, 1983, 1986, 1988, 1989, 1991, 1992, 1993, 1994
        The Regents of the University of California. All rights reserved.
FreeBSD is a registered trademark of The FreeBSD Foundation.
FreeBSD 6.2-RELEASE #0: Fri Jan 12 11:05:30 UTC 2007
    root at dessler.cse.buffalo.edu:/usr/obj/usr/src/sys/SMP
Timecounter "i8254" frequency 1193182 Hz quality 0
CPU: AMD Sempron(tm)   2400+ (1662.51-MHz 686-class CPU)
  Origin = "AuthenticAMD"  Id = 0x681  Stepping = 1

Features=0x383fbff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,MMX,FXSR,SSE>
  AMD Features=0xc0480800<SYSCALL,MP,MMX+,3DNow+,3DNow>
real memory  = 100597760 (95 MB)
avail memory = 88645632 (84 MB)
ACPI APIC Table: <AWARD  AWRDACPI>
ioapic0 <Version 1.4> irqs 0-23 on motherboard
kbd1 at kbdmux0
ath_hal: 0.9.17.2 (AR5210, AR5211, AR5212, RF5111, RF5112, RF2413, RF5413)
acpi0: <AWARD AWRDACPI> on motherboard
acpi0: Power Button (fixed)
Timecounter "ACPI-safe" frequency 3579545 Hz quality 1000
acpi_timer0: <24-bit timer at 3.579545MHz> port 0x1008-0x100b on acpi0
cpu0: <ACPI CPU> on acpi0
acpi_button0: <Power Button> on acpi0
acpi_button1: <Sleep Button> on acpi0
pcib0: <ACPI Host-PCI bridge> port
0xcf8-0xcff,0x480-0x48f,0x1000-0x10df,0x10e0-0x10ff on acpi0
pci0: <ACPI PCI bus> on pcib0
agp0: <SiS 741 host to AGP bridge> mem 0xe8000000-0xe9ffffff at device
0.0 on pci0
pcib1: <PCI-PCI bridge> at device 1.0 on pci0
pci1: <PCI bus> on pcib1
pci1: <display, VGA> at device 0.0 (no driver attached)
isab0: <PCI-ISA bridge> at device 2.0 on pci0
isa0: <ISA bus> on isab0
atapci0: <SiS 964 UDMA133 controller> port
0x1f0-0x1f7,0x3f6,0x170-0x177,0x376,0x4000-0x400f at device 2.5 on
pci0
ata0: <ATA channel 0> on atapci0
ata1: <ATA channel 1> on atapci0
ohci0: <SiS 5571 USB controller> mem 0xeb104000-0xeb104fff irq 20 at
device 3.0 on pci0
ohci0: [GIANT-LOCKED]
usb0: OHCI version 1.0, legacy support
usb0: SMM does not respond, resetting
usb0: <SiS 5571 USB controller> on ohci0
usb0: USB revision 1.0
uhub0: SiS OHCI root hub, class 9/0, rev 1.00/1.00, addr 1
uhub0: 3 ports with 3 removable, self powered
ohci1: <SiS 5571 USB controller> mem 0xeb100000-0xeb100fff irq 21 at
device 3.1 on pci0
ohci1: [GIANT-LOCKED]
usb1: OHCI version 1.0, legacy support
usb1: SMM does not respond, resetting
usb1: <SiS 5571 USB controller> on ohci1
usb1: USB revision 1.0
uhub1: SiS OHCI root hub, class 9/0, rev 1.00/1.00, addr 1
uhub1: 3 ports with 3 removable, self powered
ohci2: <SiS 5571 USB controller> mem 0xeb101000-0xeb101fff irq 22 at
device 3.2 on pci0
ohci2: [GIANT-LOCKED]
usb2: OHCI version 1.0, legacy support
usb2: SMM does not respond, resetting
usb2: <SiS 5571 USB controller> on ohci2
usb2: USB revision 1.0
uhub2: SiS OHCI root hub, class 9/0, rev 1.00/1.00, addr 1
uhub2: 2 ports with 2 removable, self powered
ehci0: <EHCI (generic) USB 2.0 controller> mem 0xeb102000-0xeb102fff irq
23 at device 3.3 on pci0
ehci0: [GIANT-LOCKED]
usb3: EHCI version 1.0
usb3: companion controllers, 3 ports each: usb0 usb1 usb2
usb3: <EHCI (generic) USB 2.0 controller> on ehci0
usb3: USB revision 2.0
uhub3: SiS EHCI root hub, class 9/0, rev 2.00/1.00, addr 1
uhub3: 8 ports with 8 removable, self powered
sis0: <SiS 900 10/100BaseTX> port 0xd000-0xd0ff mem
0xeb103000-0xeb103fff irq 19 at device 4.0 on pci0
miibus0: <MII bus> on sis0
rlphy0: <RTL8201L 10/100 media interface> on miibus0
rlphy0:  10baseT, 10baseT-FDX, 100baseTX, 100baseTX-FDX, auto
sis0: Ethernet address: 00:14:2a:54:65:ad
sis1: <NatSemi DP8381[56] 10/100BaseTX> port 0xd400-0xd4ff mem
0xeb105000-0xeb105fff irq 17 at device 9.0 on p
ci0
sis1: Silicon Revision: DP83816A
miibus1: <MII bus> on sis1
ukphy0: <Generic IEEE 802.3u media interface> on miibus1
ukphy0:  10baseT, 10baseT-FDX, 100baseTX, 100baseTX-FDX, auto
sis1: Ethernet address: 00:0f:b5:44:9f:4b
sis2: <NatSemi DP8381[56] 10/100BaseTX> port 0xd800-0xd8ff mem
0xeb106000-0xeb106fff irq 18 at device 10.0 on
pci0
sis2: Silicon Revision: DP83816A
miibus2: <MII bus> on sis2
ukphy1: <Generic IEEE 802.3u media interface> on miibus2
ukphy1:  10baseT, 10baseT-FDX, 100baseTX, 100baseTX-FDX, auto
sis2: Ethernet address: 00:0f:b5:46:99:c2
sio0: configured irq 19 not in bitmap of probed irqs 0
sio0: port may not be enabled
sio0: <Lucent kermit based PCI Modem> port
0xdc00-0xdcff,0xe000-0xe0ff,0xe400-0xe407 mem 0xeb107000-0xeb1070ff
 irq 19 at device 11.0 on pci0
sio0: type 16550A
acpi_tz0: <Thermal Zone> on acpi0
fdc0: <floppy drive controller> port 0x3f0-0x3f5,0x3f7 irq 6 drq 2 on acpi0
fdc0: [FAST]
fd0: <1440-KB 3.5" drive> on fdc0 drive 0
atkbdc0: <Keyboard controller (i8042)> port 0x60,0x64 irq 1 on acpi0
atkbd0: <AT Keyboard> irq 1 on atkbdc0
kbd0 at atkbd0
atkbd0: [GIANT-LOCKED]
psm0: <PS/2 Mouse> irq 12 on atkbdc0
psm0: [GIANT-LOCKED]
psm0: model Generic PS/2 mouse, device ID 0
pmtimer0 on isa0
orm0: <ISA Option ROM> at iomem 0xc0000-0xc7fff on isa0
ppc0: parallel port not found.
sc0: <System console> at flags 0x100 on isa0
sc0: VGA <16 virtual consoles, flags=0x300>
vga0: <Generic ISA VGA> at port 0x3c0-0x3df iomem 0xa0000-0xbffff on isa0
Timecounter "TSC" frequency 1662506085 Hz quality 800
Timecounters tick every 1.000 msec
ad0: 38166MB <Seagate ST340014A 8.01> at ata0-master UDMA100
acd0: CDROM <ATAPI-CD ROM-DRIVE-52MAX/Ver 52OP> at ata1-slave UDMA33
Trying to mount root from ufs:/dev/ad0s1a

>> I have no idea WHY it's saying IRQ 19 as IRQ 19 is used by sis0.
> 
> Interrupts on the PCI bus can be shared and quite often are.
> 

And FreeBSD doesn't support shared interrupts, right?  (At least that
used to be the case, not sure about now).  If it does allow irq sharing,
then why isn't it working?  And if it doesn't support irq sharing, then
why is FreeBSD assigning 2 devices to the same irq to begin with?

>> Now I know that device says WinModem, but this is most definitely *NOT*
>> a WinModem.
> 
> It appears that there is an error in /usr/share/misc/pci_vendors.  Feel
> free to write a bug report.  The kernel is correctly recognizing it.
> 
>> Here's the problem.  Anything that this modem outputs, requires multiple
>> inputs for it to read out on the screen.  Here's an example:
>>
>> gateway# cu -l /dev/cuad0 -s 57600
>> Connected
>> at&v
>>
>>    Option               Selection       AT Cmd
>>    ---------------      ------------    --------
> ...
> 
> So it _does_ work.
> 
>> In order to get that output, I have to hit either enter or space 61
>> times (yes sixty-one is not a typo) to get it.  When it prints, it only
>> prints out about 16 characters at a time (which happens to be the size
>> of the FIFO buffer in a generic 16550A UART).
> 
> Probably because the interrupts are not working.
> 
>> As to why FreeBSD is assigning two devices to the same IRQ I have no
>> idea, especially since there are plenty of IRQs available that can be
>> used (serial, parallel are turned off in the BIOS).
> 
> Probably because your motherboard vendor decided to save a few deci-
> cents by not bothering to connect up all the available interrupt
> inputs and just share one.  This isn't FreeBSD - it's the copper
> tracks on your motherboard.
> 

Its kinda strange though if that was the case, the other cards wouldn't
work then because they would all be sharing the same irq.  The 3 network
interfaces are assigned 17, 18, and 19.  sis0 is on the mainboard, sis1
and sis2 are add-in cards on the pci bus.

-- 
Daniel Rudy