Hello together!
Many thanks to all of you, who thought about my problem and tried to help me. (Special thanks to Graham). The solution was in the end simple, but really unexpected.
It was a BIOS problem!
In my BIOS I had the following settings:
Plug & Play O/S: Yes (Yes/No)
Peripheral Configuration/ Serial Port A: Auto (Auto/Disable/Enable)
The Suse-handbook tells me: < In Linux the BIOS is not active. During the Linux start it gets deactivated. The Linux kernel has better routines to test for ...ports...> (my rough translation from German)
During booting Linux tells me, it is installing the serial ports and
afterwards shows the right resources and the correct irq !
In spite of it, all tests were negative and the port stayed dead.
Only when I changed the BIOS setting to
Peripheral Configuration/ Serial Port A: Enable (Auto/Disable/Enable)
everything works beautifully!
The question remains, why?
Can anybody explain me, why Linux doesn't use the ports even if it gets all the necessary information at booting or later manually?
Happy Eastern
Dirk
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