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com port conflict

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5 replies

by ronmc 1 view

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I have a server with 2 built in com ports. I bought an ISA card with two more com ports on it. The first two ports have i/o addresses of 3F8h and 2F8h respectively. I set the jumpers on the ISA card for 3E8h and 2E8H respectively.
I set the IRQ's (11 and 12)to legacy in the bios setup and when the computer boots, the bios recognizes 4 ports with the above i/o addresses but when linux boots, it assigns irq 3 and 4 to both pairs of com ports and the 2nd pair doesn't work.
Can anyone help?
Thanks,
Ron

5 replies

by ivan

Plase in file
/etc/rc.d/rc.sysinit
com port initialtion string like this
/bin/setserial /dev/ttyS2 port 0x03e8 irq 11
/bin/setserial /dev/ttyS2 port 0x02e8 irq 12

by ronmc

I figured that the /dev/ttyS2 in each line of your response should have been S2 on one line and S3 on the other, so I entered it that way and and the two new ports still didn't work.

by mark_sheard

Make sure you have PNP disabled in bios,you can also check to make sure you have confured your ISA Serial Board to the correct IRQ irq 11 or 12 as this is what you have specified in the bios as legacy,
you can also try changed the irq on the isa board..

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