I just had similar problems with 2.1.131 with an old DX2/66 PC
with real old 16450 uarts (no other 2.1.x kernels tested, but 2.0.36
works fine). mouse didn't work and even
# stty < /dev/ttyS0
stty: standard input: Input/output error
failed. setserial reported `UART: unknown' but kernel startup
did detect them correctly:
<6>Serial driver version 4.26 with no serial options enabled
<6>ttyS00 at 0x03f8 (irq = 4) is a 16450
<6>ttyS01 at 0x02f8 (irq = 3) is a 16450
after
# setserial /dev/ttyS0 uart 16450
everything worked fine again!
On Dec 10, Richard B. Johnson wrote:
> There is a problem with the Serial Communications in Linux
> Version 2.1.131.
>
> If a previous Operating System or DOS Program turns on the FIFOs
> on the UARTs, but does not turn them OFF when it exits, the machine
> must be powered off before they will work in Linux.
>
> On my system, the two UARTS are properly identified upon startup:
>
> `dmesg`
>
> [SNIPPED]
> Starting kswapd v 1.5
> parport0: PC-style at 0x378 [SPP,PS2,EPP]
> Serial driver version 4.26 with no serial options enabled
> ttyS00 at 0x03f8 (irq = 4) is a 16550A
> ttyS01 at 0x02f8 (irq = 3) is a 16550A
> pty: 256 Unix98 ptys configured
> Floppy drive(s): fd0 is 1.44M
> [SNIPPED]
>
> Setserial is executed during SYSV startup and displays both of the
> devices names and types.
>
> When /dev/ttyS1 is opened by executing `od /dev/ttyS1`, the proper
> interrupt is acquired:
>
> `cat /proc/interrupts`
>
> CPU0 CPU1
> 0: 90455 90106 IO-APIC-edge timer
> 1: 2082 2054 IO-APIC-edge keyboard
> 2: 0 0 XT-PIC cascade
> 3: 14896 14928 IO-APIC-edge serial
> 10: 25642 25621 IO-APIC-level eth0
> 11: 3319 3353 IO-APIC-level BusLogic BT-958
> 13: 1 0 XT-PIC fpu
> NMI: 0
> IPI: 0
>
> However, I use this port for a serial mouse when using 'X'. It
> does not work. A terminal program, Seyon, cannot read data from
> this or the other device either.
>
> The only fix under Linux is to shut down, power off, then restart.
>
> I have verified that if I write a 0 to the FCR (base + 2), to
> turn off the FIFO (from DOS debug), before I start Linux, the
> serial ports run okay (on my machine). Something like this should
> probably be added to the driver initialization code.
>
> Cheers,
> Dick Johnson
> ***** FILE SYSTEM WAS MODIFIED *****
> Penguin : Linux version 2.1.131 on an i686 machine (400.59 BogoMips).
> Warning : It's hard to remain at the trailing edge of technology.
>
>
> -
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> Please read the FAQ at http://www.tux.org/lkml/
Harald
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