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authorAaron Durbin <adurbin@chromium.org>2014-02-25 20:36:56 -0600
committerAaron Durbin <adurbin@google.com>2014-03-07 15:30:27 +0100
commitc34713d33e088095acb6dd61527a26117d9c368e (patch)
tree020c5387801605f753fca25cc6b2c09ff5763e30 /src/cpu/x86/Kconfig
parent7274800ea37edf41cb50e899d03baa02bdeecade (diff)
downloadcoreboot-c34713d33e088095acb6dd61527a26117d9c368e.tar.xz
x86: add MIRROR_PAYLOAD_TO_RAM_BEFORE_LOADING option
Boot speeds can be sped up by mirroring the payload into main memory before doing the actual loading. Systems that would benefit from this are typically Intel ones whose SPI are memory mapped. Without the SPI being cached all accesses to the payload in SPI while being loaded result in uncacheable accesses. Instead take advantage of the on-board SPI controller which has an internal cache and prefetcher by copying 64-byte cachelines using 32-bit word copies. Change-Id: I4aac856b1b5130fa2d68a6c45a96cfeead472a52 Signed-off-by: Aaron Durbin <adurbin@chromium.org> Reviewed-on: http://review.coreboot.org/5305 Tested-by: build bot (Jenkins) Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net> Reviewed-by: Vladimir Serbinenko <phcoder@gmail.com> Reviewed-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Diffstat (limited to 'src/cpu/x86/Kconfig')
-rw-r--r--src/cpu/x86/Kconfig9
1 files changed, 9 insertions, 0 deletions
diff --git a/src/cpu/x86/Kconfig b/src/cpu/x86/Kconfig
index 19fa246fe2..b5bb7e62c2 100644
--- a/src/cpu/x86/Kconfig
+++ b/src/cpu/x86/Kconfig
@@ -121,3 +121,12 @@ config BACKUP_DEFAULT_SMM_REGION
help
The cpu support will select this option if the default SMM region
needs to be backed up for suspend/resume purposes.
+
+config MIRROR_PAYLOAD_TO_RAM_BEFORE_LOADING
+ def_bool n
+ help
+ On certain platforms a boot speed gain can be realized if mirroring
+ the payload data stored in non-volatile storage. On x86 systems the
+ payload would typically live in a memory-mapped SPI part. Copying
+ the SPI contents to ram before performing the load can speed up
+ the boot process.