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authorWerner Zeh <werner.zeh@siemens.com>2023-11-28 16:26:28 +0100
committerFelix Held <felix-coreboot@felixheld.de>2023-11-30 15:03:33 +0000
commit722c0b7b210ff31fafd6275e2fa2bd1c0838847c (patch)
treeb4849463d5ccedc8757b391d4146ceda680bb784 /src/mainboard
parentfd1c2f488f4ce0e931db3d944ef5fd1faed98fe1 (diff)
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>
Diffstat (limited to 'src/mainboard')
-rw-r--r--src/mainboard/siemens/mc_ehl/romstage_fsp_params.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/src/mainboard/siemens/mc_ehl/romstage_fsp_params.c b/src/mainboard/siemens/mc_ehl/romstage_fsp_params.c
index 28fca2da10..d386d756a6 100644
--- a/src/mainboard/siemens/mc_ehl/romstage_fsp_params.c
+++ b/src/mainboard/siemens/mc_ehl/romstage_fsp_params.c
@@ -38,4 +38,8 @@ void mainboard_memory_init_params(FSPM_UPD *memupd)
/* Enable Row-Hammer prevention */
memupd->FspmConfig.RhPrevention = 1;
+ if (CONFIG(BOARD_SIEMENS_MC_EHL1)) {
+ /* Allow writes to EEPROM addresses 0x50..0x57. */
+ memupd->FspmConfig.SmbusSpdWriteDisable = 0;
+ }
}