From b794a69ce9b2cbb9d6565cf0f3ac609402ad680a Mon Sep 17 00:00:00 2001 From: Patrick Rudolph Date: Tue, 8 Aug 2017 13:13:51 +0200 Subject: nb/intel/sandybridge/raminit: Add Kconfig option for fuses Add a new Kconfig option to ignore memory fuses that limit the maximum DRAM frequency to be used. The option is disabled by default and should only enabled by experienced users as it might decrease system stability or prevent a successful RAM training. Remove conflicting devicetree settings. Change-Id: I35dd78a02bcaafce8ba522d253c795d7835bacae Signed-off-by: Patrick Rudolph Reviewed-on: https://review.coreboot.org/20907 Tested-by: build bot (Jenkins) Reviewed-by: Arthur Heymans Reviewed-by: Nicola Corna --- src/northbridge/intel/sandybridge/Kconfig | 12 ++++++++++++ src/northbridge/intel/sandybridge/raminit_common.c | 3 +++ 2 files changed, 15 insertions(+) (limited to 'src/northbridge') diff --git a/src/northbridge/intel/sandybridge/Kconfig b/src/northbridge/intel/sandybridge/Kconfig index 2d13f286e9..7c954fbbcb 100644 --- a/src/northbridge/intel/sandybridge/Kconfig +++ b/src/northbridge/intel/sandybridge/Kconfig @@ -44,6 +44,18 @@ config USE_NATIVE_RAMINIT Select if you want to use coreboot implementation of raminit rather than System Agent/MRC.bin. You should answer Y. +config NATIVE_RAMINIT_IGNORE_MAX_MEM_FUSES + bool "Ignore vendor programmed fuses that limit max. DRAM frequency" + default n + depends on USE_NATIVE_RAMINIT + help + Ignore the mainboard's vendor programmed fuses that might limit the + maximum DRAM frequency. By selecting this option the fuses will be + ignored and the only limits on DRAM frequency are set by RAM's SPD and + hard fuses in southbridge's clockgen. + Disabled by default as it might causes system instability. + Handle with care! + config CBFS_SIZE hex default 0x100000 diff --git a/src/northbridge/intel/sandybridge/raminit_common.c b/src/northbridge/intel/sandybridge/raminit_common.c index c6ff551fbf..3e69f4da72 100644 --- a/src/northbridge/intel/sandybridge/raminit_common.c +++ b/src/northbridge/intel/sandybridge/raminit_common.c @@ -402,6 +402,9 @@ unsigned int get_mem_min_tck(void) /* If this is zero, it just means devicetree.cb didn't set it */ if (!cfg || cfg->max_mem_clock_mhz == 0) { + if (IS_ENABLED(CONFIG_NATIVE_RAMINIT_IGNORE_MAX_MEM_FUSES)) + return TCK_1333MHZ; + rev = pci_read_config8(PCI_DEV(0, 0, 0), PCI_DEVICE_ID); if ((rev & BASE_REV_MASK) == BASE_REV_SNB) { -- cgit v1.2.3