On bootup, dmesg shows this when macserial.o is loaded:
macserial: i2c-modem detected, id: 1
PowerMac Z8530 serial driver version 2.0
tty00 at 0xd9867020 (irq = 22) is a Z8530 ESCC
tty01 at 0xd986e000 (irq = 23) is a Z8530 ESCC (IrDA)
i2c-core.o: i2c core module
So, I assume that /dev/ttyS1 is the SIR interface.
# cat /dev/ttyS1
cat: /dev/ttyS1: Input/output error
Obviously, irattach therefore fails.
I am running the latest 2.4.20 from benh.
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