Bug#808246: Stretch fails to install on OpenPOWER systems

["Timothy Pearson" <kb9vqf@pearsoncomputing.net>]

Package: linux-image-4.2.0-1-powerpc64le
Version: 4.2.6-3
Severity: grave

Using the latest debian-installer netboot kernel to install on an
OpenPOWER server; install proceeds normally until disk detection when it
fails stating no disks can be found.  dmesg shows a slew of errors similar
to the following:

fat: no symbol version for TOC.
fat: Unknown symbol TOC. (err -22)
ext4: no symbol version for TOC.
ext4: Unknown symbol TOC. (err -22)
ahci: no symbol version for TOC.
ahci: Unknown symbol TOC. (err -22)

Forcibly loading the modules (modprobe --force ext4, etc.) and resuming
the installer allows the system to install normally, however the same
issue shows up on reboot.  This causes a boot failure that cannot be
overridden as the modprobe version in the initramfs does not support the
force parameter.

Jessie installs normally on the same system.