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FreeDOS / MS-Dos / Windows 3.11 cannot perform reboot with 'isapc' machine
I was installing MS-Dos 6.22 + Windows 3.11 in preparation for running Microsoft Bob, and noticed that when they try to perform a reboot, they just get stuck. The console cursor stays flashing on/off, but the DOS prompt no longer responds to input.
It is fairly easy to reproduce, even FreeDOS is impacted - download the FreeDOS bootable CDROM image, then
$ qemu-img create demo.img 100MB
$ qemu-system-x86_64 -machine isapc -cdrom ~/Downloads/FD12CD.iso -hda demo.img -monitor stdio
Wait for the installer to startup, and then in the monitor console run
sendkey ctrl-alt-delete
It will fail to reboot
Testing shows this is a regression from QEMU 2.8.0 onwards, and git bisect further narrowed it down to a SEABIOS update
commit 6e99f5741ff1b408ea76e6caf2bd4f76df4060e9 (HEAD, tag: pull-seabios-20161027-2, tag: pull-seabios-20161027-1, refs/bisect/bad)
Author: Gerd Hoffmann <email address hidden>
Date: Thu Oct 27 16:42:28 2016 +0200
seabios: update to 1.10.0 release.
Note that this seems particular to the "isapc" machine type - with the "pc" machine type, reboot still works
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