Date: Fri, 18 Aug 2000 18:21:36 +0600 (LKT)
From: Mayowa Aregbsola <maregbesola AT yahoo DOT com>
X-Sender: kalum AT roadrunner DOT grendel DOT net
To: djgpp AT delorie DOT com
Subject: Problems communicating with PCI Modems :(
Message-ID: <Pine.LNX.4.21.0008181816200.735-100000@roadrunner.grendel.net>
MIME-Version: 1.0
Content-Type: TEXT/PLAIN; charset=US-ASCII
Reply-To: djgpp AT delorie DOT com

Greetings,

I am trying to communicate with a PCI modem but so far
I have not succeeded. If I try to communicate with an
EISA modem or an external modem, the program works. I
was able to detect one PCI modem (I have not been able
to detect others) on COM3 but was not able to detect
its IRQ. When I changed the base address to the base
address I received from the dump below, the system
hung up. The dump I got from querying the PCI modem is
as follows: (it gives the modem configuration.)

----------------------------------------------------------------
PCI bus 00 device 0B function 00:  Header Type
'non-bridge' (single-func)
Vendor: 11C1    AT&T Microelectronics
Device: 0440    L56xMF
Class:    07    communication           Revision:     
 01
SubClass: 80    other                   ProgramI/F:   
Status Reg:      0290 = CapList fast-trns (med)
CacheLine:         00   Latency:        00      BIST: 
      00
SubsysVendor:    11C1   SubsysDevice: 0440
Base Addresses:
        (0) DE800000 = mem base=DE800000 len=256
        (1) 0000BC01 = I/O base=0000BC00 len=8
        (2) 0000C001 = I/O base=0000C000 len=256
CardBus:     00000040   ExpansionROM: 00000000 (no
ROM)
INTline:           0B   INTpin:       01
MinGrant:          FC   MaxLatency:   0E
Device-Specific Data:
 40: FFFFFFFF  FFFFFFFF  FFFFFFFF  FFFFFFFF  FFFFFFFF 
FFFFFFFF
 58: FFFFFFFF  FFFFFFFF  FFFFFFFF  FFFFFFFF  FFFFFFFF 
FFFFFFFF
 70: FFFFFFFF  FFFFFFFF  FFFFFFFF  FFFFFFFF  FFFFFFFF 
FFFFFFFF
 88: FFFFFFFF  FFFFFFFF  FFFFFFFF  FFFFFFFF  FFFFFFFF 
FFFFFFFF
 A0: FFFFFFFF  FFFFFFFF  FFFFFFFF  FFFFFFFF  FFFFFFFF 
FFFFFFFF
 B8: FFFFFFFF  FFFFFFFF  FFFFFFFF  FFFFFFFF  FFFFFFFF 
FFFFFFFF
 D0: FFFFFFFF  FFFFFFFF  FFFFFFFF  FFFFFFFF  FFFFFFFF 
FFFFFFFF
 E8: FFFFFFFF  FFFFFFFF  FFFFFFFF  FFFFFFFF  E6210001 
00000000
Capabilities List:
         ID @F8 = 01 PCI Power Management
         PMC    =  DevSpec Init D1-supp D2-supp
PME#-D2 PME#-D3hot PME#-D3cold
                DynClk = 0, PCI_PM version = 1
         PMCSR  = 0000, data-select=0
unknown/unimplemented
                state=D0
         PMCSRX = -- -- -- --
         Data   = 00

----------------------------------------------------------------

Please, could anyone decode this dump for me and could
someone tell me how to communicate with PCI devices. I
want to know if it is possible to communicate with
these devices by reading from or writing to their I/O
memory directly or by using BIOS calls. How is it
done? I would also like to know if the same offsets
for normal COM ports work with the PCI ports and how?

Thank you,
Mayowa Aregbsola