After upgrading from 6.0, my USR internal voice modem
(ttyS3) no longer works.  It seems that isapnp says that the
IO port is in use from /proc/ioports, but of course it is!
It seems that as the kernel starts up, it allocates the IO
ports and interrupts.  So far, the only way I can disable
this seems to be turning off serial support in the kernel
altogether.  isapnp then works as expected but I can't do
much without serial port access.  I have rebuilt the kernel
a few times with different serial and plug-and-play
optiions, but the result is exactly the same (except when I
turn of serial port support).  I don't know if this is a
problem with the kernel or isapnp.

I should mention that the modem was working fine in RH 5.1,
5.2, and 6.0.

Here are some info:

dmesg says:

Serial driver version 4.27 with SHARE_IRQ enabled
ttyS00 at 0x03f8 (irq = 4) is a 16550A
ttyS01 at 0x02f8 (irq = 3) is a 16550A
ttyS03 at 0x02e8 (irq = 3) is a 16550A

minicom doesn't work.

isapnp at boot up says:

Board 1 has Identity ... CTL0024 ...
Board 2 had Identity ... USR3070 ...
CTL0024/... [0] {Audio}: Ports 0x220 0x330 0x388; IRQ5 DMA1
DMA5 --- Enabled OK
CTL0024/... [2] {Reserved}: Port 0x2F0; --- Enabled OK
CTL0024/... [3] {Game}: Port 0x200; --Enabled OK
/etc/isapnp.conf: 422 -- Fatal - resource conflict
allocating 8 bytes of IO at 2E8 (see /proc/ioports)
/etc/isapnp.conf: 422 -- Fatal - Error occurred executing
request <IORESCHECK> --- Further acton aborted.

Also, my vgetty.ttyS3 gives:

10/23 21:05:58 yS3  vgetty: experimental test release 0.9.4
/ 20Jul99
10/23 21:05:58 yS3  mgetty: experimental test release
1.1.21-Jul24
10/23 21:05:59 yS3  reading generic configuration from
config file /etc/mgetty+sendfax/voice.conf
10/23 21:05:59 yS3  reading program vgetty configuration
from config file /etc/mgetty+sendfax/voice.conf
10/23 21:05:59 yS3  reading port ttyS3 configuration from
config file /etc/mgetty+sendfax/voice.conf
10/23 21:05:59 yS3  check for lockfiles
10/23 21:05:59 yS3  locking the line
10/23 21:05:59 yS3  lowering DTR to reset Modem
10/23 21:06:00 yS3  send: \dATQ0V1H0[0d]
10/23 21:06:00 yS3  waiting for ``OK'' ** found **
10/23 21:06:01 yS3  send: ATS0=0Q0&D3&C1[0d]
10/23 21:06:01 yS3  waiting for ``OK'' ** found **
10/23 21:06:01 yS3  mdm_send: 'ATI'
10/23 21:06:01 yS3  USR Courier/Sportster 56k detected
10/23 21:06:01 yS3  mdm_send: 'ATI3'
10/23 21:06:01 yS3  additional info: 'U.S. Robotics 56K
Voice INT V4.9.1'
10/23 21:06:01 yS3  mdm_send: 'AT+FCLASS=2.0' -> OK
10/23 21:06:01 yS3  mdm_send: 'AT+FAA=1;+FCR=1' -> OK
10/23 21:06:02 yS3  mdm_send: 'AT+FBO=1' -> OK
10/23 21:06:02 yS3  mdm_send: 'AT+FNR=1,1,1,0' -> OK
10/23 21:06:02 yS3  mdm_send: 'AT+FLI="(519) 747-5733"' ->
OK
10/23 21:06:02 yS3  mdm_send: 'AT+FCC=1,5,0,2,0,0,0,0' -> OK
10/23 21:06:02 yS3  detecting voice modem type
10/23 21:06:04 yS3  US Robotics detected
10/23 21:06:05 yS3  US Robotics voice modem
10/23 21:06:05 yS3  This is a driver beta version. V0.4.b3
10/23 21:06:06 yS3  VTD setup successful
10/23 21:06:06 yS3  vgetty: Modem returned ERROR
10/23 21:06:07 yS3  setting ringback delay didn't work
10/23 21:06:07 yS3  waiting...

That's quite a bit of stuff to look through.  Let me know if
you need any other information (e.g. isapnp.conf).

I have also tried the latest isapnptools 1.19 downloaded
from the official web page, but it didn't work either.