> No, this boot= option is deprecated too. AFAIK boot=off does (and always
> did) nothing.  boot=on tells qemu to boot from the disk using extboot option
> rom. This was needed to boot from virtio disks. Now SeaBIOS can boot from
> virtio disk natively, so extboot no longer needed. But due to the ways BIOS 
> boot
> specification is written only one disk can be bootable in the system, so if 
> one
> disk has bootindex specified other disks will not participate in the boot 
> even if
> the disk with bootindex specified is not bootable.

Thanks for that info.

Another possibility to disable network boot would be to avoid loading 
the pxe-XXX.rom network boot ROMs. Or is that a bad idea?

- Dietmar

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