Cc'ing avocado-devel for test idea. On 1/20/21 4:11 PM, Michael Tokarev wrote: > As someone noticed on IRC, old (2.x) RedHat floppies does not boot > in current qemu. When qemu is booted from floppy image at > https://archive.org/details/RedHatLinuxBootDisk521998 > (download the "ISO image" link there, it really is an 1.44 floppy), > seabios says Boot failed and that's it. > > I run git bisect with it, knowing that qemu 2.1 works fine, and > it pointed out to this commit which is oldish qemu-2.5+: > > commit 4812fa27fa75bce89738a82a191755853dd88408 > Author: John Snow <js...@redhat.com> > Date: Fri Jan 22 15:51:05 2016 -0500 > > fdc: change auto fallback drive for ISA FDC to 288 > > The 2.88 drive is more suitable as a default because > it can still read 1.44 images correctly, but the reverse > is not true. > > Since there exist virtio-win drivers that are shipped on > 2.88 floppy images, this patch will allow VMs booted without > a floppy disk inserted to later insert a 2.88MB floppy and > have that work. > > This patch has been tested with msdos, freedos, fedora, > windows 8 and windows 10 without issue: if problems do > arise for certain guests being unable to cope with 2.88MB > drives as the default, they are in the minority and can use > type=144 as needed (or insert a proper boot medium and omit > type=144/288 or use type=auto) to obtain different drive types. > > As icing, the default will remain auto/144 for any pre-2.6 > machine types, hopefully minimizing the impact of this change > in legacy hw to basically zero. > > Reviewed-by: Eric Blake <ebl...@redhat.com> > Signed-off-by: John Snow <js...@redhat.com> > Message-id: 1453495865-9649-13-git-send-email-js...@redhat.com > > Now, I don't even know where to put that "type=144/288/auto" thing, > I tried this: > > -drive > file=RedHatLinuxBootDisk521998.disk1of1.img,if=floppy,format=raw,type=144 > > but it says that format=raw does not support "type=144" option. > > And it's even more: I don't remember which size should be an 1.44Mb > floppy :)) > The file size of that image is 1492992 bytes which does not look like it > is of > standard size, but I can't find which size it should be. > > Thanks! > > /mjt >
