siemens/mc_bdx1: Set up opcode menu for SPI controller

Since SPI controller opcode registers are locked by FSP, they need to be
initialized to a known good state before ReadyToBoot event and after
every SPI flash access (e.g. for MRC cache) has been finished in order
to enable the OS to use SPI controller without constraints.

Change-Id: I0a66344cd44e036c3999ae98d539072299cf5112
Signed-off-by: Werner Zeh <werner.zeh@siemens.com>
Reviewed-on: https://review.coreboot.org/15547
Tested-by: build bot (Jenkins)
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
1 file changed