Re: PCI modem doesn't work after 2.4.2->2.4.10 upgrade

[Steven Walter <srwalter@yahoo.com>]

Unlike 2.4.2, 2.4.10 can automatically detect and configure PCI modems.
That's why its already in use to setserial.  The kernel has already
found your modem, and assigned it ttyS4 (0-3 are reserved for the
standard COM1-4).  Theoretically, then, all you have to do is relink
/dev/modem to /dev/ttyS4, and you should be set.

If you had read through 'dmesg', and the problem if what I suspect it
is, you would have seen this pretty obviously.

On Sat, Oct 13, 2001 at 07:04:30PM -0400, pd wrote:
> I was running kernel 2.4.2 just fine with my US Robotics PCI modem.
> When I upgrade the kernel to 2.4.10 the modem no longer works.
> 
> Configuration:
>    Red Hat 7.1 distribution, 256MB memory, Dell Optiplex
>    lspci reports the modem as follows:
> 
> 02:09.0 Serial controller: US Robotics/3Com 56K FaxModem Model 5610 (rev 01)
>   (prog-if 02 [16550])
> 	Subsystem: US Robotics/3Com: Unknown device 00d7
> 	Control: I/O+ Mem- BusMaster- SpecCycle- MemWINV- VGASnoop- ParErr- 
> Stepping- SERR+ FastB2B-
> 	Status: Cap+ 66Mhz- UDF- FastB2B- ParErr- DEVSEL=medium >TAbort- <TAbort- 
> <MAbort- >SERR- <PERR-
> 	Interrupt: pin A routed to IRQ 5
> 	Region 0: I/O ports at dcf8 [size=8]
> 	Capabilities: [dc] Power Management version 2
> 		Flags: PMEClk- DSI- D1- D2+ AuxCurrent=0mA PME(D0+,D1-,D2+,D3hot+,D3cold-)
> 		Status: D0 PME-Enable- DSel=0 DScale=2 PME-
> 
> I have the modem configured as /dev/ttyS2.  The system has two real serial
> ports at ttyS0 and ttyS1.   /dev/modem is a link to /dev/ttyS2.
> setserial reports as follows on 2.4.2:
> 
> 	  /dev/ttyS2, UART: 16550A, Port: 0xdcf8, IRQ: 5
> 
> On 2.4.10 setserial reports as follows instead:
> 
> 	  /dev/ttyS2, UART: unknown, Port: 0x03e8, IRQ: 4
> 
> I can change the uart type and IRQ settings just fine, to match those
> shown on 2.4.2.  But when I use setserial to change the IO port address
> to 0xdcf8 on 2.4.10 I get a message that the address is already in use.
> 
> Another clue is when rebooting from one kernel to the other a KUDZU
> window appears saying that the modem has been removed and do I want to
> change the configuration.  I always say keep the old configuration.
> 
> The modem continues to work just fine on 2.4.2.
> 
> A further clue is the following "Multimedia" device reported by lspci.
> Note the IO port addresses:
> 
> 02:0b.0 Multimedia controller: CMD Technology Inc PCI0647 (prog-if 8f)
> 	Subsystem: CMD Technology Inc PCI0647
> 	Control: I/O+ Mem- BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- 
> Stepping- SERR- FastB2B-
> 	Status: Cap- 66Mhz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- 
> <MAbort- >SERR- <PERR-
> 	Latency: 64 (500ns min, 1000ns max)
> 	Interrupt: pin A routed to IRQ 5
> 	Region 0: I/O ports at dcf0 [size=8]
> 	Region 1: I/O ports at dce8 [size=4]
> 	Region 2: I/O ports at dcd8 [size=8]
> 	Region 3: I/O ports at dcd0 [size=4]
> 	Region 4: I/O ports at dcb0 [size=16]
> 
> The Region 0 port at dcf0, plus its size of 8 is dcf8, where the modem is.
> Does 2.4.10 think that dcf0+8 is using dcf8 where 2.4.2 does not?
> 
> The only difference in the lspci listings is as follows.  The entry for
> an Intel Bridge chip actually has an additional line in it on 2.4.10, the
> last line below showing "pin ? routed to IRQ 9".  Since the hardware
> is identical for both boots, I would think the lspci listings to be
> identical.
> 
> 00:07.3 Bridge: Intel Corporation 82371AB PIIX4 ACPI (rev 02)
> 	Control: I/O+ Mem- BusMaster- SpecCycle- MemWINV- VGASnoop- ParErr- 
> Stepping- SERR- FastB2B-
> 	Status: Cap- 66Mhz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- 
> <MAbort- >SERR- <PERR-
> 	Interrupt: pin ? routed to IRQ 9
> 
> -pd
> -
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-- 
-Steven
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