diff options
| author | Angel Pons <th3fanbus@gmail.com> | 2020-11-19 12:02:07 +0100 |
|---|---|---|
| committer | Patrick Georgi <pgeorgi@google.com> | 2020-11-22 22:13:18 +0000 |
| commit | 09fc4b90ebfdb81914f6b89b676db101a417414a (patch) | |
| tree | 83bc2c85c49be6c2327a6bb0764306eb4ce844e3 /src/northbridge/intel/sandybridge/Kconfig | |
| parent | 2ad03a43ecf0c97634f27ebcc2132b8e4286ceb3 (diff) | |
nb/intel/sandybridge: Refine power-down mode logic
When memory is running at fast frequencies, power-down modes can lessen
system stability. Check tXP and tXPDLL values and use safer power down
modes if their values are high. Do not use APD with DLL-off on mobile:
vendor firmware does not use it, and it can influence system stability.
Change-Id: Ic8e98162ca86ae454a8c951be163d58960940e0e
Signed-off-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/47746
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Arthur Heymans <arthur@aheymans.xyz>
Diffstat (limited to 'src/northbridge/intel/sandybridge/Kconfig')
| -rw-r--r-- | src/northbridge/intel/sandybridge/Kconfig | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/src/northbridge/intel/sandybridge/Kconfig b/src/northbridge/intel/sandybridge/Kconfig index ef6dc3daf5..9cd522f85b 100644 --- a/src/northbridge/intel/sandybridge/Kconfig +++ b/src/northbridge/intel/sandybridge/Kconfig @@ -99,6 +99,15 @@ config DCACHE_RAM_MRC_VAR_SIZE hex default 0x0 +config RAMINIT_ALWAYS_ALLOW_DLL_OFF + bool "Also enable memory DLL-off mode on desktops and servers" + default n + help + If enabled, allow enabling DLL-off mode for platforms other than + mobile. Saves power at the expense of higher exit latencies. Has + no effect on mobile platforms, where DLL-off is always allowed. + Power down is disabled for stability when running at high clocks. + config RAMINIT_ENABLE_ECC bool "Enable ECC if supported" default y |