tree cdb32d1930cb3630c6b193a8b80be7e4a6335a3d
parent 5cd1a433f48c659dbebc1c31840890ba29f4fe16
author Suraj Jitindar Singh <sjitindarsingh@gmail.com> 1507260585 +1100
committer Suraj Jitindar Singh <sjitindarsingh@gmail.com> 1507606901 +1100

vpnor: Fix unable to read unaligned partition override files

Currently when using vpnor and an override file is applied which has
an unaligned size it is impossible to read the last unaligned bit of
the file. This is because the response to the host truncates the window
size when converting from bytes to blocks (effectively aligning down
the size and causing the window to look smaller than it is).

We could blindly align up the size but then the host would be within
its rights to access uninitialised memory which we would like to avoid.
To work around this we always align the window size up to a multiple
of block size. Any memory not read from the file is set to 0xFF to
mimic erased flash.

Fixes: https://github.com/openbmc/openbmc/issues/2344

Reported-by: Stewart Smith <sesmith@au1.ibm.com>
Signed-off-by: Suraj Jitindar Singh <sjitindarsingh@gmail.com>
Change-Id: Ic857c31e9402b98ab19dba1a23adc74eaf40491b