Bug#783982: D-i: preseed from floppy no longer works !

[Alexey Eromenko <al4321@gmail.com>]

Package: debian-installer
Version: 20150422

Hi,

in older versions of Debian (6.x and 7.x), I could load preseed script
from floppy, and it would work.

I had to change isolinux / bootloader with "preseed/file=/floppy/preseed.cfg":

label debian
  kernel /install.$arch/vmlinuz
  append initrd=/install.$arch/initrd.gz debian-installer/locale=en_US
keymap=us console-setup/layoutcode=us netcfg/choose_interface=auto
priority=critical preseed/file=/floppy/preseed.cfg --

Debian 8 returns me "Failed to retrieve the preconfiguration file"
error, with exactly the same setup.

I need this feature to enable unattended install of Debian 8 VM in
VirtualBox (vbox-unattended feature), where preseed script gets loaded
from virtual floppy.
https://forums.virtualbox.org/viewtopic.php?f=10&t=46798

Working with "debian-8.0.0-amd64-DVD-1.iso". Official Jessie 8.0
Debian installer.
Please fix "preseed/file=/floppy/preseed.cfg":

As a separate, but related question: is it possible to load preseed
script from 2nd CDROM ? (IDE Secondary Slave, or SATA 2nd CD...)
I tried "preseed/file=/cdrom2/preseed.cfg", but it didn't work.

Thanks in advance,
-- 
-Alexey Eromenko "Technologov", 01.May.2015.