PnP Supra, i/o port conflict

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4 total messages Started by Senthil R. Kumar Thu, 05 Oct 1995 17:07

Author: Senthil R. Kumar
Date: Thu, 05 Oct 1995 17:07

67 lines
2639 bytes

Setup:

   Supra Express 288i PnP internal modem (*Plug and Play* device)
   ISA i/o controller card (Yakima S1372, make by Tyan).
   TYAN II motherboard, Triton chipset, P5-75, Award BIOS 2.1 (latest)
   Linux 1.2.8, Slackware 2.3

Problem:

   There seems to be some kind of a irq/port conflict with the i/o ports
   as defined by the I/O card and the modem, under Linux *and* DOS.

Symptoms:

1. Disabling, both the com ports on the board

   a) Supra is happy, and I am able to use the modem perfectly.
      Modem sits at 0x3f8, irq 4

      Of course, now, I cannot use the mouse.

2. Diabling com1 and enabling com2 on the board

   a) The modem works perfectly. (0x3f8, irq4)

   b) The mouse does not work. But there is some responce, because,
      pressing the mouse buttons like a madman, one can see the mouse cursor
      (gpm), intermittently. (once every 2-3 minutes)

      I have tired moving the irq to 10, 15, etc, but there is *no*
      improvement. This is really strange!
      
      Have made sure that /dev/modem, /dev/mouse, were
      pointing correctly.

3. Enable both the com ports on the I/O card

   a) Com ports sit at 0x3f8 and 0x2f8 (using jumpers on the board),
      Modem seems to sit at 0x3e8.
   
      Using minicom:
         ATH, does not give me the usual OK. Made sure, echo was on,
         ATE1 etc.
         
         *However*, the modem does take in commands, because I can get
         it to dial. It dials, makes the connection etc, and then
         finally drops the connection (I can hear it) but, of course,
         I see nothing on the screen, which is what is happenening
         when it does not report back an OK for the ATH, I think.  

         Modem takes about 5 seconds to respond, to an ATDT command.

      Mouse works ok.

   b) Moved the com ports around, same thing as above.

Some observations:

The modem always seems to grab 0x3f8 and irq 4, no matter what. I was
told from the TYAN support that the reponsibility of assigning ports,
irq etc was the OS's. However, I simply cannot move the modem, using
setserial.

I would appreciate some pointers.
thanks,

Senthil

Re: PnP Supra, i/o port conflict

Author: Christian Mueller-Planitz
Date: Fri, 06 Oct 1995 03:25

34 lines
1751 bytes

srk106@minpro.mng.psu.edu (Senthil R. Kumar) wrote:

>Setup:

>   Supra Express 288i PnP internal modem (*Plug and Play* device)
>   ISA i/o controller card (Yakima S1372, make by Tyan).
>   TYAN II motherboard, Triton chipset, P5-75, Award BIOS 2.1 (latest)
>   Linux 1.2.8, Slackware 2.3

>Problem:

>   There seems to be some kind of a irq/port conflict with the i/o ports
>   as defined by the I/O card and the modem, under Linux *and* DOS.

I think your BIOS supports PnP, right ?

The BIOS assigns the resources (IRQ, DMA, I/O ports..) to the PnP card
after the Power Up Self Test (POST). Part of the PnP standard is the
DOS ICU (Interrupt Config., Utility) that allows you to *reassign* PnP
resources. This has to be done only once. The PnP config is stored in
an EEPROM on the board and is used (if the BIOS does not detect new
hardware) at the next boot of the system.

Does your Bios detect the modem (message: 'detect: PnP modem ...') 
What about your other ports ? Do they still work if the modem is
detected ?

good luck 
 --CMP

P.S.: my PnP modem works fine. The PnP bios detected my other com
ports and assigned COM3 to the modem. Since I am not running a PnP-OS
(Windows NT) I have told NT to look for the modem on COM3. The same
should work under Linux.

Re: PnP Supra, i/o port conflict

Author: Dan Moore
Date: Fri, 06 Oct 1995 14:14

31 lines
1871 bytes

srk106@minpro.mng.psu.edu (Senthil R. Kumar) wrote:
>Setup:
>   Supra Express 288i PnP internal modem (*Plug and Play* device)
>   ISA i/o controller card (Yakima S1372, make by Tyan).
>   TYAN II motherboard, Triton chipset, P5-75, Award BIOS 2.1 (latest)
>   Linux 1.2.8, Slackware 2.3
>Problem:
>   There seems to be some kind of a irq/port conflict with the i/o ports
>   as defined by the I/O card and the modem, under Linux *and* DOS.

        Assuming your system has a PnP BIOS you should be ok, as long as the 
PnP BIOS knows about all the non-PnP hardware in your system.   If the PnP 
BIOS has not be told what resources are used by your ISA I/O card then 
it will assign the I/O addresses and IRQs used by that ISA card to 
the PnP cards it finds.

        In a PnP BIOS there is an option to allocate resources to ISA cards, 
for example on IRQs you typically get a menu which lists all the IRQs and 
lets you assign them to ISA (ie. non-PnP cards), PnP or PCI.   Sometimes the 
ISA setting is referred to as "disabled" or "unavailable".  (This depends on 
the PnP BIOS, since I haven't used an Award PnP BIOS I don't know how they 
describe this option.)

         Once the PnP BIOS knows what resources (IRQs, DMA channels, I/O 
addresses) are used by non-PnP hardware it can then correctly assign resources 
to the PnP devices without any conflicts.


--
Dan Moore
Supra

Re: PnP Supra, i/o port conflict

Author: Senthil Kumar
Date: Sat, 07 Oct 1995 15:59

6 lines
677 bytes

Thanks for the suggestions. The problem was indeed with an
ill-configured PnP BIOS.

The modem works fine now.

Senthil

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