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| author | Patrick Rudolph <siro@das-labor.org> | 2016-06-11 18:39:35 +0200 |
|---|---|---|
| committer | Martin Roth <martinroth@google.com> | 2016-06-20 21:44:15 +0200 |
| commit | 7bddd30e948e6c3856336e77221fdbe5ba749453 (patch) | |
| tree | 612c242d2a1dc475000ab4a2e5ebfcf823d500d9 /src/mainboard/lenovo/t420/devicetree.cb | |
| parent | 4089a17cb925a0e9f305e29d4d6b38a2b24d8f56 (diff) | |
| download | coreboot-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.cb | 3 |
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 |