Sunday, August 7, 2011

Debian s390: channel numbers and consoles

Three things I learned about Debian s390 today:
  • The kernel expects hexadecimal channel numbers in lower case. Trying uppercase digits is futile.
  • To get a getty in the HMC's Operating System Messages window of an LPAR, just uncomment the dumb console entry in /etc/inittab.
  • For the integrated ASCII console to work on LPAR, you need to put up a getty onto ttysclp0. You can reuse the same parameters as for ttyS0 (the device that just works with z/VM). Unlike the 3270 interface of z/VM the integrated ASCII console is actually pretty nice and usable. You can even run vim in it without getting completely crazy.

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