arch/x86/acpigen: Fix corner case in _ROM generator

In case the Option ROM isn't a multiple of 4KiB the last buffer was
truncated to prevent a buffer overrun. But tests on nouveau showed
that nouveau expects a buffer that has the requested size and is zero
padded instead.

Always return a buffer with requested size and zero pad the remaining
bytes. Fixes nouveau on Lenovo W520 with Option ROM not being multiple
of 4 KiB.

Change-Id: I3f0ecc42a21945f66eb67f73e511bd516acf0fa9
Signed-off-by: Patrick Rudolph <siro@das-labor.org>
Reviewed-on: https://review.coreboot.org/25999
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Nico Rikken <nico@nicorikken.eu>
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Reviewed-by: Naresh Solanki <naresh.solanki@intel.com>

0 files changed, 0 insertions, 0 deletions