On 03.03.2021 16:36, Alan Altmark wrote: > On Wednesday, 03/03/2021 at 02:25 GMT, Peter Oberparleiter > <ober...@linux.ibm.com> wrote: >> 3. Use the ASCII Console as Linux console >> >> - add "console=ttyS1" to kernel parameters in /etc/zipl.conf >> (mind the upper-case S) >> - run zipl + reboot >> >> During boot you should see all Linux console output on the ASCII >> Console. > > Is there a way to tell Linux, "Use the ascii console unless there isn't > one, in which case use the 3215 console instead."?
You can tell Linux to print console output to both ASCII and 3215 consoles by repeating the console= statement for ttyS0 (3215) and ttyS1 (ASCII). You can also configure Linux to provide a login prompt that works independently on both consoles. The one thing that's not possible with the current implementation is to control the Linux init process from both consoles. This is typically necessary if there's an error during early boot - like a root file system corruption - that requires manual intervention to resolve. The input device that is connected to the init process is determined once during kernel initialization depending on the order of console= statements (the last one will be used for input) and it cannot be changed without a reboot. Regards, Peter Oberparleiter -- Peter Oberparleiter Linux on Z Development - IBM Germany ---------------------------------------------------------------------- For LINUX-390 subscribe / signoff / archive access instructions, send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or visit http://www2.marist.edu/htbin/wlvindex?LINUX-390
