Public bug reported:

Hello!
I had hit an problem described and fixed here:
https://bugzilla.redhat.com/show_bug.cgi?id=1020622:

When creating VM with more than one drive attached to virtio-scsi bus
Seabios can not detect the second drive. Especially it breaks using of
config drive with Openstack.

System:
# lsb_release -rd
Description:    Ubuntu 16.04.3 LTS
Release:        16.04

Package:
# apt-cache policy seabios 
seabios:
  Installed: 1.10.2-1ubuntu1~cloud0
  Candidate: 1.10.2-1ubuntu1~cloud0
  Version table:
 *** 1.10.2-1ubuntu1~cloud0 500
        500 http://ubuntu-cloud.archive.canonical.com/ubuntu 
xenial-updates/pike/main amd64 Packages
        500 http://ubuntu-cloud.archive.canonical.com/ubuntu 
xenial-updates/pike/main i386 Packages
        100 /var/lib/dpkg/status
     1.8.2-1ubuntu1 500
        500 http://ubuntu.mirrors.ovh.net/ftp.ubuntu.com/ubuntu xenial/main 
amd64 Packages
        500 http://ubuntu.mirrors.ovh.net/ftp.ubuntu.com/ubuntu xenial/main 
i386 Packages

Steps to reproduce:
1. Create an instance with more than 1 drive attached to virtio-scsi bus, 
bootable drive have to be on non-zero numbered LUN.
2. Try to boot instance with one of these drives.

Expected result: Boot from bootable drive connected as non-zero LUN.
Actual result: "no bootable device" on instance's screen when accessing VNC 
console, no visible second drive when using Boot Menu.

Workaround: copy Seabios binaries from latest RH release over stock
binaries.

** Affects: seabios (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1734679

Title:
  Seabios failed to detect virtio-scsi device

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