Ubuntu
qemu package

  1. Bug #1563887
  2. Comment #43

Comment 43 for bug 1563887

Revision history for this message
Robin H. Johnson (robbat2) wrote :

TL;DR: pass '-vga none' with -nographic, or redirect the screen somewhere!

I ended up digging into this after it was mentioned by smoser. The bug is invalid because of a bad assumption in the QEMU inputs. smoser's workaround of usb=off removes USB as a workaround.

The kernel, OpenFirmware, and QEMU are behaving correctly, but the original command-line hides the screen output.

If you have both a supported* keyboard AND screen, then OpenFirmware/SLOF sets OF stdout to be the screen.
This causes the OF output of 'No console specified using screen & keyboard'

If you are missing either a keyboard OR screen, then OF sets stdout to be hvterm (serial).
This causes the OF output of 'No console specified using hvterm'

https://git.qemu.org/?p=SLOF.git;a=blob;f=board-qemu/slof/OF.fs;h=4e04b840d5e6ff6c39191939e1a4f70f3d169d5d;hb=HEAD#l215

Which devices are available depends on the QEMU commandline...
Base QEMU defaults to '-vga std'.
QEMU '-machine pseries' defaults to enabling USB.

Re supported keyboards: The OpenFirmware/SLOF only seems to support USB keyboards at this time (virtio keyboard not supported).