SB800: Add IMC ROM and fan control.

Add configuration for AMD's IMC ROM and fan registers for cimx/sb800
platforms.

- Allows user to add the IMC rom to the build and to configure the
  location of the "signature" between the allowed positions.
- Allows for no fan control, manual setup of SB800 Fan registers, or
  setup of the IMC fan configuration registers.
- Register configuration is done through devicetree.cb. No files need
  to be added for new platform configuration.
- Initial setup is for Persimmon, but may be extended to any cimx/sb800
  platform.

Change-Id: Ib06408d794988cbb29eed6adbeeadea8b2629bae
Signed-off-by: Martin Roth <martin@se-eng.com>
Reviewed-on: http://review.coreboot.org/1977
Tested-by: build bot (Jenkins)
Reviewed-by: Patrick Georgi <patrick@georgi-clan.de>
Reviewed-by: Marc Jones <marcj303@gmail.com>

1 files changed, 1 insertions, 0 deletions

diff --git a/src/southbridge/amd/cimx/sb800/cfg.c b/src/southbridge/amd/cimx/sb800/cfg.c
index 71fea672d5..ebc9918890 100644
--- a/src/southbridge/amd/cimx/sb800/cfg.c
+++ b/src/southbridge/amd/cimx/sb800/cfg.c
@@ -112,6 +112,7 @@ void sb800_cimx_config(AMDSBCFG *sb_config)
 	sb_config->BuildParameters.PCIBSsid = PCIB_SSID;
 	sb_config->BuildParameters.SpreadSpectrumType = Spread_Spectrum_Type;
 	sb_config->BuildParameters.HpetBase = HPET_BASE_ADDRESS;
+	sb_config->BuildParameters.ImcEnableOverWrite = IMC_ENABLE_OVER_WRITE;
 
 	/* General */
 	sb_config->SpreadSpectrum = SPREAD_SPECTRUM;