[Bug 1848231] Re: serial/parallel character devices created for the none-machine

[Peter Maydell]

You can start 'none' without "-serial null". Examples:

qemu-system-x86_64 -machine none
qemu-system-x86_64 -machine none -monitor stdio
qemu-system-x86_64 -machine none -nographic
qemu-system-x86_64 -machine none -monitor stdio -display none

Your command line "qemu-system-x86_64 -machine none -nographic -monitor
stdio" fails because "-nographic" says "please create a serial port
using stdio" but "-monitor stdio" tries to use stdio for something else.
You get the same message for any machine (eg "pc"), not just "none". If
what you wanted was "just don't create the graphical display" that's
"-display none" -- "-nographic" is a collection of things including both
'no display' and also 'default to creating a serial device to stdio' and
'default to creating a monitor muxed with that serial'.


** Changed in: qemu
       Status: New => Invalid

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https://bugs.launchpad.net/bugs/1848231

Title:
  serial/parallel character devices created for the none-machine

Status in QEMU:
  Invalid

Bug description:
  The none-machine can not be started unless using "-serial null":

  qemu-system-x86_64 -machine none -nographic -monitor stdio
  QEMU 3.1.1 monitor - type 'help' for more information
  (qemu) qemu-system-x86_64: cannot use stdio by multiple character devices
  qemu-system-x86_64: could not connect serial device to character backend 
'stdio'
  $

  $ qemu-system-mips -machine none -nographic -serial null -monitor stdio
  QEMU 4.1.50 monitor - type 'help' for more information
  (qemu) info chardev
  parallel0: filename=null
  compat_monitor0: filename=stdio
  serial0: filename=null
  (qemu)

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