On 01.03.2021 21:26, Davis, Larry (National VM Capability) wrote: > What are people doing when the local Linux people are wanting ASCII Consoles > available for performing reboots or problem resolution > > I know I can attach the SYSASCII (HMC ASCII vt220 console) to a Linux image > > Does the Linux image need to include "ttys1" in the /etc/zipl.conf file for > RHEL 7.5 and above? > console=ttyS1 console=ttyS0
You can specify "console=ttyS1" as additional kernel parameter if you want to have console output written to the ASCII Console, and also to use that console as input device for early boot problems (e.g. dracut rescue shell). > We tested attaching it to a Running Linux but the device never really worked > when attached, we probably missed something > > Any Suggestions on using this properly? I just tried this on an RHEL 7.5 z/VM guest and everything seemed to work without problems. Some things to try out (requires root privileges): 1. Attach ASCII console to guest from within Linux guest $ vmcp att sysascii to '*' 2. To check the connection to the ASCII console: open the "Integrated HMC ASCII Console" task for the z/VM LPAR. Then issue in Linux: $ echo test > /dev/ttysclp0 The result should be "test" being displayed on the ASCII Console. 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. You can also check this connection using the following command: $ echo test > /dev/console The "test" message should again be displayed on the ASCII Console. 4. Enable login from the ASCII Console $ systemctl start serial-getty@ttysclp0.service When this command completes, there should be a login prompt shown on the ASCII Console. You can also check the status of this systemctl unit using: $ systemctl status serial-getty@ttysclp0.service 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
