x86: Add some notes for MRC cache with Intel FSP
MRC cache relies on Intel FSP to produce a special GUID that
contains the MRC cache data. Add such information in the
CONFIG_ENABLE_MRC_CACHE help entry.
Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index 2ba36b7..65cbb9c 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -274,6 +274,13 @@
to be used for speeding up boot time on future reboots and/or
power cycles.
+ For platforms that use Intel FSP for the memory initialization,
+ please check FSP output HOB via U-Boot command 'fsp hob' to see
+ if there is FSP_NON_VOLATILE_STORAGE_HOB_GUID (asm/fsp/fsp_hob.h).
+ If such GUID does not exist, MRC cache is not avaiable on such
+ platform (eg: Intel Queensbay), which means selecting this option
+ here does not make any difference.
+
config HAVE_MRC
bool "Add a System Agent binary"
depends on !HAVE_FSP