[SeaBIOS] Seabios unable to boot Fedora-based instances

[Kevin O'Connor]

On Thu, Aug 10, 2017 at 10:36:37AM -0400, Kevin O'Connor wrote:
> On Thu, Aug 10, 2017 at 11:18:32AM +0200, Maciej Józefczyk wrote:
> > Hello,
> > 
> > Environment: Seabios master dd9bba5b9c1d5175a2757f3fdc9d554b4c8eea3a
> > Qemu: 1:2.5+dfsg-5ubuntu10.14
> > OS: Ubuntu 16.04
> > 
> > We found that newest Seabios (dd9bba5b9c1d5175a2757f3fdc9d554b4c8eea3a)
> > is not working with latest Fedora 26 - image taken from:
> > https://download.fedoraproject.org/pub/fedora/linux/releases/26/CloudImages/x86_64/images/Fedora-Cloud-Base-26-1.5.x86_64.qcow2
> > 
> > Each time it hangs on "Probing EDD (edd=off to disable)... OK".
> > 
> > We discovered that rollback to version 4902b8a7 solves the problem. It
> > seems that something is wrong with 4902b8a7. After fetch lastest master
> > and rollback of 4902b8a7 - Fedora is able to boot.
> > 
> > Ubuntu is booting all the time without problem.
> > 
> > Could you take a look on this?
> 
> Thanks.  I do see a defect in 4902b8a7 - it is not generating linesize
> correctly (see patch below).

FYI, I committed this patch.

-Kevin