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authorPatrick Rudolph <siro@das-labor.org>2016-06-11 18:39:35 +0200
committerMartin Roth <martinroth@google.com>2016-06-20 21:44:15 +0200
commit7bddd30e948e6c3856336e77221fdbe5ba749453 (patch)
tree612c242d2a1dc475000ab4a2e5ebfcf823d500d9 /src/mainboard/lenovo/t420/devicetree.cb
parent4089a17cb925a0e9f305e29d4d6b38a2b24d8f56 (diff)
downloadcoreboot-7bddd30e948e6c3856336e77221fdbe5ba749453.tar.xz
nb/intel/sandybridge/raminit: Allow 933Mhz on Lenovo devices
Set max_mem_clock_mhz in devicetree to 933Mhz. Allows to run the memory at up to DDR3-1866. The same frequency was allowed within the first vendor bios, but Lenovo than decided to limit it to DDR3-1333. Tested on Lenovo T520 and DDR3-1600 DIMM (RMT3170eb86e9w16). The RAM is now running at DDR3-1600 instead of DDR3-1333. This gives about 4% performance increase in glmark2 using the Intel GPU. Change-Id: If15be497402d84a2778f0434b6381a64eda832d6 Signed-off-by: Patrick Rudolph <siro@das-labor.org> Reviewed-on: https://review.coreboot.org/15158 Tested-by: build bot (Jenkins) Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net> Reviewed-by: Martin Roth <martinroth@google.com>
Diffstat (limited to 'src/mainboard/lenovo/t420/devicetree.cb')
-rw-r--r--src/mainboard/lenovo/t420/devicetree.cb3
1 files changed, 3 insertions, 0 deletions
diff --git a/src/mainboard/lenovo/t420/devicetree.cb b/src/mainboard/lenovo/t420/devicetree.cb
index 809e3eed22..a921f765cb 100644
--- a/src/mainboard/lenovo/t420/devicetree.cb
+++ b/src/mainboard/lenovo/t420/devicetree.cb
@@ -18,6 +18,9 @@ chip northbridge/intel/sandybridge
register "gpu_cpu_backlight" = "0x1155"
register "gpu_pch_backlight" = "0x06100610"
+ # Override fuse bits that hard-code the value to 666 Mhz
+ register "max_mem_clock_mhz" = "933"
+
device cpu_cluster 0 on
chip cpu/intel/socket_rPGA988B
device lapic 0 on end