Multiport serial cards with kernel 2.6.10

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Is there a different method to initialize dumb multiport serial cards
in the 2.6 kernel or is there a bug in the kernel and/or setserial?

I'm using a four port PC/104 card from WinSystems (PCM-COM4A-16) which
has been verified with the the following scripts on both a 2.2.x and
2.4.29 kernels and everything seems to work fine.  Addresses show up
correctly in /proc/ioports and /proc/interrupts and work fine while
transmittng data.

setserial /dev/ttyS4 port 0x100 irq 7 uart 16550A ^fourport
setserial /dev/ttyS5 port 0x108 irq 7 uart 16550A ^fourport
setserial /dev/ttyS6 port 0x110 irq 7 uart 16550A ^fourport
setserial /dev/ttyS7 port 0x118 irq 7 uart 16550A ^fourport
setserial /dev/ttyS4 set_multiport port1 0x240 mask1 0xf match1 0

Using the same hardware, I receive the following error when the script
is ran with a 2.6.10 kernel.

/dev/ttyS0 at 0x03f8 (irq = 4) is a 16550A
/dev/ttyS1 at 0x02f8 (irq = 3) is a 16550A
/dev/ttyS2 at 0x03e8 (irq = 2) is a 16550A
/dev/ttyS3 at 0x02e8 (irq = 11) is a 16550A
/dev/ttyS4 at 0x0100 (irq = 7) is a 16550A
/dev/ttyS5 at 0x0108 (irq = 7) is a 16550A
/dev/ttyS6 at 0x0110 (irq = 7) is a 16550A
/dev/ttyS7 at 0x0118 (irq = 7) is a 16550A
Cannot get multiport config: Invalid argument
/dev/ttyS4 at 0x0100 (irq = 7) is a 16550A

I cannot figure out how to set the shared interrupt status register
with the 2.6.10 kernel.  What am I missing??

The kernel config is set as follows:
# Serial drivers
# CONFIG_SERIAL_8250_CS is not set
# CONFIG_SERIAL_8250_DETECT_IRQ is not set

Any help would be greatly appreciated.  I've about exhausted my limited
troubleshooting techniques and patience on this one.  Googled to find
similar questions but no solutions.


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