tree b4849463d5ccedc8757b391d4146ceda680bb784
parent fd1c2f488f4ce0e931db3d944ef5fd1faed98fe1
author Werner Zeh <werner.zeh@siemens.com> 1701185188 +0100
committer Felix Held <felix-coreboot@felixheld.de> 1701356613 +0000

mb/siemens/mc_ehl: Enable write access for SPD EEPROM on mc_ehl1

The address space of possible SPD-EEPROMs 0x50..0x53 on the SMBus
interface is per default write-protected in FSP. This avoids that an
SPD-EEPROM on a DRAM module gets overwritten by the host.

On mc_ehl1, memory-down configuration is used and there is no SPD EEPROM
available. Nevertheless, there is a general purpose EEPROM on the same
address available which needs to stay writeable.

This patch disables the default-enabled write protect feature for the
SPD-EEPROM addresses just for mc_ehl1.

Test=Boot into Linux and make sure a write access into the EEPROM is
possible.

Change-Id: I6b0fcdbeb0dbf971cfdceb70d6f4845765a3bdb6
Signed-off-by: Werner Zeh <werner.zeh@siemens.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/79334
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Jan Samek <jan.samek@siemens.com>