qemu-devel.nongnu.org archive mirror
 help / color / mirror / Atom feed
* [Bug 1923663] [NEW] Can't(?) disable default floppy drive any more in qemu 6.0
@ 2021-04-13 20:10 Adam Williamson
  2021-04-14  7:06 ` Markus Armbruster
                   ` (2 more replies)
  0 siblings, 3 replies; 7+ messages in thread
From: Adam Williamson @ 2021-04-13 20:10 UTC (permalink / raw)
  To: qemu-devel

Public bug reported:

There's a documented change in qemu 6.0:

https://qemu-project.gitlab.io/qemu/system/removed-features.html#floppy-
controllers-drive-properties-removed-in-6-0

where you can't configure floppy controller device properties with
-global any more. However, there's a thing you could do with the old
parameter which I can't figure out a way to do with the documented
replacement. openQA passed exactly this argument:

-global isa-fdc.driveA=

and that has the effect of removing/disabling the default floppy
drive/controller. If you just run `qemu-system-i686` (no other args)
you'll see the VM briefly try to boot from a floppy drive; if you run
`qemu-system-i686 -global isa-fdc.driveA=` (with an earlier version of
qemu, obviously) you'll see it does not do so.

I can't see a way to do this with `-device floppy`. Going by the docs,
the equivalent should be:

-device floppy,unit=0,drive=

but that does not seem to have the same effect. If you run `qemu-
system-i686 -device floppy,unit=0,drive=`, it still tries to boot from a
floppy drive.

I see there's a -nodefaults option that disables *all* default devices,
but I don't think that's what we want here either. We might want the
other default devices, we just don't want the floppy drive.

** Affects: qemu
     Importance: Undecided
         Status: New

-- 
You received this bug notification because you are a member of qemu-
devel-ml, which is subscribed to QEMU.
https://bugs.launchpad.net/bugs/1923663

Title:
  Can't(?) disable default floppy drive any more in qemu 6.0

Status in QEMU:
  New

Bug description:
  There's a documented change in qemu 6.0:

  https://qemu-project.gitlab.io/qemu/system/removed-features.html
  #floppy-controllers-drive-properties-removed-in-6-0

  where you can't configure floppy controller device properties with
  -global any more. However, there's a thing you could do with the old
  parameter which I can't figure out a way to do with the documented
  replacement. openQA passed exactly this argument:

  -global isa-fdc.driveA=

  and that has the effect of removing/disabling the default floppy
  drive/controller. If you just run `qemu-system-i686` (no other args)
  you'll see the VM briefly try to boot from a floppy drive; if you run
  `qemu-system-i686 -global isa-fdc.driveA=` (with an earlier version of
  qemu, obviously) you'll see it does not do so.

  I can't see a way to do this with `-device floppy`. Going by the docs,
  the equivalent should be:

  -device floppy,unit=0,drive=

  but that does not seem to have the same effect. If you run `qemu-
  system-i686 -device floppy,unit=0,drive=`, it still tries to boot from
  a floppy drive.

  I see there's a -nodefaults option that disables *all* default
  devices, but I don't think that's what we want here either. We might
  want the other default devices, we just don't want the floppy drive.

To manage notifications about this bug go to:
https://bugs.launchpad.net/qemu/+bug/1923663/+subscriptions


^ permalink raw reply	[flat|nested] 7+ messages in thread

end of thread, other threads:[~2021-05-15 14:17 UTC | newest]

Thread overview: 7+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2021-04-13 20:10 [Bug 1923663] [NEW] Can't(?) disable default floppy drive any more in qemu 6.0 Adam Williamson
2021-04-14  7:06 ` Markus Armbruster
2021-04-15 12:36   ` Peter Maydell
2021-04-15 12:36     ` Peter Maydell
2021-04-15 14:53     ` Markus Armbruster
2021-04-15  9:04 ` [Bug 1923663] " Kashyap Chamarthy
2021-05-15 14:05 ` Thomas Huth

This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).