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multiport serial card setup




>> Hi!
>> I have using Brain Boxes UC-260 4xserial port card for many years on >
>> Debian 6.0.10 Squeeze. Now I have build a new box with this card for
>> Stretch and I recognize that old "tricks" are does not work.
>> The old recipe was
>> /etc/lilo.conf
>>   append="8250.nr_uarts=8"
>
> If I'm reading
<https://www.kernel.org/doc/html/v4.10/admin-guide/kernel-
parameters.html> correctly, the correct command line parameter is just
> "nr_uarts=8". So it may be that the kernel is ignoring your command and
> only providing you with the default 4.
>
>
>> In result I have 8 nodes for serial devices, up to ttyS7
>> /etc/serial.conf
>> /dev/ttyS4 uart 16750 port 0xd100 irq 20 baud_base 115200 spd_normal
>> skip_test ^fourport
>> /dev/ttyS5 uart 16750 port 0xd108 irq 20 baud_base 115200 spd_normal
>> skip_test ^fourport
>> /dev/ttyS6 uart 16750 port 0xd110 irq 20 baud_base 115200 spd_normal
>> skip_test ^fourport
>> /dev/ttyS7 uart 16750 port 0xd118 irq 20 baud_base 115200 spd_normal
>> skip_test ^fourport
>> Thats all. Every port are working well.
>> With stretch it does not work at all.
>> After reboot, from command line:
>> $ setserial /dev/ttyS4 -a
>> Invalid argument
>>
>> Same command but as root:
>> # setserial /dev/ttyS4 -a
>> /dev/ttyS4, Line 4, UART: 16750, Port: 0xd100, IRQ: 20
>>         Baud_base: 115200, close_delay: 50, divisor: 0
>>        closing_wait: 3000
>>        Flags: spd_normal skip_test
>>
>> Seem to be work? - not yet, using minicom it can not receive even
himself >> (sort cut pins 2-3 w/o any handshake). Port address and irq
was taken
>> from lspci and proved by windows 10 running on the same box.
>> I cleaned up /etc/serial.conf as this card does not exist at all.
>> I tried to setup serial by hand:
>> # setserial /dev/ttyS4 uart 16550A port 0xd100 irq 20 baud_base 115200
spd_normal skip_test
>> Invalid argument

>> The error seem less in kernel log.
>> I have tried several settings - decide which argument is wrong. At last
>> turn out that /dev/ttyS4, the device node is invalid, I can set it as
>> /dev/ttyS1 (no such a "standard" port in my box), but card still wont
>> work.
>> I have tried several Debian live Strecth and Jessie distros with the same
>> result. I have also tried SystemRescue CD with more up to date kernel but
>> got the same result.
>> I also lookup the manufacturer suggested "driver" - in real it is only
>> some patches in grub and rc.local but it still does not work.
>> In windows 10 it is work well.
>> I was submitted a bug report to Debian about the setserial, but I'm not
>> sure that it is setserial problem, I suspect kernel?
>> I have no idea what to do more. Any suggestion would be highly
>> appreciated. I'm not too good in kernel debugging.
>>
>> Sincerely
>>   tovis

Thanks Darac!

This working well
>> /etc/lilo.conf
>>   append="8250.nr_uarts=8"
Result is
# ls /dev/ttyS*
/dev/ttyS0 /dev/ttyS1 /dev/ttyS2 /dev/ttyS3 /dev/ttyS4 /dev/ttyS5
/dev/ttyS6 /dev/ttyS7

I was changed that to
/etc/lilo.conf
  append="nr_uarts=8"
It does not work at all!
# ls /dev/ttyS*
/dev/ttyS0 /dev/ttyS1 /dev/ttyS2 /dev/ttyS3

Something is missing on kernel.org web page - really strange!